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183 rows where part_number = 179 and title_number = 49 sorted by section_id
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| section_id ▼ | title_number | title_name | chapter | subchapter | part_number | part_name | subpart | subpart_name | section_number | section_heading | agency | authority | source_citation | amendment_citations | full_text |
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| 49:49:3.1.1.1.2.1.1.1 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | A | Subpart A—Introduction, Approvals and Reports | § 179.1 General. | PHMSA | [Amdt. 179-17, 41 FR 38183, Sept. 9, 1976, as amended by Amdt. 179-50, 60 FR 49076, Sept. 21, 1995; 68 FR 48571, Aug. 14, 2003] | (a) This part prescribes the specifications for tanks that are to be mounted on or form part of a tank car and which are to be marked with a DOT specification. (b) Except as provided in paragraph (c) of this section, tanks to which this part is applicable, must be built to the specifications prescribed in this part. (c) Tanks built to specifications predating those in this part may continue in use as provided in § 180.507 of this subchapter. (d) Any person who performs a function prescribed in this part, shall perform that function in accordance with this part. (e) When this part requires a tank to be marked with a DOT specification (for example, DOT-105A100W), compliance with that requirement is the responsibility of the tank builder. Marking the tank with the DOT specification shall be understood to certify compliance by the builder that the functions performed by the builder, as prescribed in this part, have been performed in compliance with this part. (f) The tank builder should inform each person to whom that tank is transferred of any specification requirements which have not been met at time of transfer. | |||
| 49:49:3.1.1.1.2.1.1.2 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | A | Subpart A—Introduction, Approvals and Reports | § 179.2 Definitions and abbreviations. | PHMSA | [29 FR 18995, Dec. 20, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21344, Nov. 6, 1971; Amdt. 179-50, 60 FR 49076, Sept. 21, 1995; Amdt. 179-50, 61 FR 33255, June 26, 1996; 63 FR 52850, Oct. 1, 1998; 66 FR 45186, 45390, Aug. 28, 2001; 68 fR 75759, Dec. 31, 2003] | (a) The following apply in part 179: (1) AAR means Association of American Railroads. (2) Approved means approval by the AAR Tank Car Committee. (3) ASTM means American Society for Testing and Materials. (4) [Reserved] (5) Definitions in part 173 of this chapter also apply. (6) F means degrees Fahrenheit. (7) NGT means National Gas Taper Threads. (8) NPT means an American Standard Taper Pipe Thread conforming to the requirements of NBS Handbook H-28 (IBR, see § 171.7 of this subchapter). (9) [Reserved] (10) Tank car facility means an entity that manufactures, repairs, inspects, tests, qualifies, or maintains a tank car to ensure that the tank car conforms to this part and subpart F of part 180 of this subchapter, that alters the certificate of construction of the tank car, that ensures the continuing qualification of a tank car by performing a function prescribed in parts 179 or 180 of this subchapter, or that makes any representation indicating compliance with one or more of the requirements of parts 179 or 180 of this subchapter. (11) Tanks means tank car tanks. (b) [Reserved] | |||
| 49:49:3.1.1.1.2.1.1.3 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | A | Subpart A—Introduction, Approvals and Reports | § 179.3 Procedure for securing approval. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967 and amended by Amdt. 179-41, 52 FR 36672, Sept. 30, 1987; 63 FR 52850, Oct. 1, 1998; 68 FR 48571, Aug. 14, 2003; 70 FR 73166, Dec. 9, 2005] | (a) Application for approval of designs, materials and construction, conversion or alteration of tank car tanks under these specifications, complete with detailed prints, must be submitted in prescribed form to the Executive Director—Tank Car Safety, AAR, for consideration by its Tank Car Committee and other appropriate committees. Approval or rejections of applications based on appropriate committee action will be issued by the executive director. (b) When, in the opinion of the Committee, such tanks or equipment are in compliance with the requirements of this subchapter, the application will be approved. (c) When such tanks or equipment are not in compliance with the requirements of this subchapter, the Committee may recommend service trials to determine the merits of a change in specifications. Such service trials may be conducted only if the builder or shipper applies for and obtains a special permit. | |||
| 49:49:3.1.1.1.2.1.1.4 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | A | Subpart A—Introduction, Approvals and Reports | § 179.4 Changes in specifications for tank cars. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967 and amended by Amdt. 179-41, 52 FR 36672, Sept. 30, 1987; 63 FR 52850, Oct. 1, 1998; 70 FR 73166, Dec. 9, 2005] | (a) Proposed changes in or additions to specifications for tanks must be submitted to the Executive Director—Tank Car Safety, AAR, for consideration by its Tank Car Committee. An application for construction of tanks to any new specification may be submitted with proposed specification. Construction should not be started until the specification has been approved or a special permit has been issued. When proposing a new specification, the applicant shall furnish information to justify a new specification. This data should include the properties of the lading and the method of loading and unloading. (b) The Tank Car Committee will review the proposed specifications at its earliest convenience and report its recommendations through the Executive Director—Tank Car Safety to the Department. The recommendation will be considered by the Department in determining appropriate action. | |||
| 49:49:3.1.1.1.2.1.1.5 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | A | Subpart A—Introduction, Approvals and Reports | § 179.5 Certificate of construction. | PHMSA | [Amdt. 179-10, 36 FR 21344, Nov. 6, 1971, as amended at 63 FR 52850, Oct. 1, 1998; 68 FR 48571, Aug. 14, 2003] | (a) Before a tank car is placed in service, the party assembling the completed car shall furnish a Certificate of Construction, Form AAR 4-2 to the owner and the Executive Director—Tank Car Safety, AAR, certifying that the tank, equipment, and car fully conforms to all requirements of the specification. (b) When cars or tanks are covered in one application and are identical in all details are built in series, one certificate will suffice for each series when submitted to the Executive Director—Tank Car Safety, AAR. (c) If the owner elects to furnish service equipment, the owner shall furnish the Executive Director—Tank Car Safety, AAR, a report in prescribed form, certifying that the service equipment complies with all the requirements of the specifications. (d) When cars or tanks which are covered on one application and are identical in all details are built in series, one certificate shall suffice for each series when submitted to the Executive Director—Tank Car Safety, AAR. One copy of the Certificate of Construction must be furnished to the Executive Director—Tank Car Safety, AAR for each car number of consecutively numbered group or groups covered by the original application. | |||
| 49:49:3.1.1.1.2.1.1.6 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | A | Subpart A—Introduction, Approvals and Reports | § 179.6 Repairs and alterations. | PHMSA | [68 FR 75759, Dec. 31, 2003] | For procedure to be followed in making repairs or alterations, see appendix R of the AAR Specifications for Tank Cars (IBR, see § 171.7 of this subchapter). | |||
| 49:49:3.1.1.1.2.1.1.7 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | A | Subpart A—Introduction, Approvals and Reports | § 179.7 Quality assurance program. | PHMSA | [Amdt. 179-50, 60 FR 49076, Sept. 21, 1995, as amended by Amdt. 179-50, 61 FR 33255, June 26, 1996; 68 FR 48571, Aug. 14, 2003; 68 FR 75759, Dec. 31, 2003] | (a) At a minimum, each tank car facility shall have a quality assurance program, approved by AAR, that— (1) Ensures the finished product conforms to the requirements of the applicable specification and regulations of this subchapter; (2) Has the means to detect any nonconformity in the manufacturing, repair, inspection, testing, and qualification or maintenance program of the tank car; and (3) Prevents non-conformities from recurring. (b) At a minimum, the quality assurance program must have the following elements (1) Statement of authority and responsibility for those persons in charge of the quality assurance program. (2) An organizational chart showing the interrelationship between managers, engineers, purchasing, construction, inspection, testing, and quality control personnel. (3) Procedures to ensure that the latest applicable drawings, design calculations, specifications, and instructions are used in manufacture, inspection, testing, and repair. (4) Procedures to ensure that the fabrication and construction materials received are properly identified and documented. (5) A description of the manufacturing, repair, inspection, testing, and qualification or maintenance program, including the acceptance criteria, so that an inspector can identify the characteristics of the tank car and the elements to inspect, examine, and test at each point. (6) Monitoring and control of processes and product characteristics during production. (7) Procedures for correction of nonconformities. (8) Provisions indicating that the requirements of the AAR Specifications for Tank Cars (IBR, see § 171.7 of this subchapter), apply. (9) Qualification requirements of personnel performing non-destructive inspections and tests. (10) Procedures for evaluating the inspection and test technique employed, including the accessibility of the area and the sensitivity and reliability of the inspection and test technique and minimum detectable crack length. (11) Procedures for the periodic calibration and measurement of inspection a… | |||
| 49:49:3.1.1.1.2.1.1.8 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | A | Subpart A—Introduction, Approvals and Reports | § 179.8 Limitation on actions by states, local governments, and Indian tribes. | PHMSA | [74 FR 1801, Jan. 13, 2009] | Sections 5125 and 20106 of Title 49, United States Code, limit the authority of states, political subdivisions of states, and Indian tribes to impose requirements on the transportation of hazardous materials in commerce. A state, local, or Indian tribe requirement on the transportation of hazardous materials by rail may be preempted under either 49 U.S.C. 5125 or 20106, or both. (a) Section 171.1(f) of this subchapter describes the circumstances under which 49 U.S.C. 5125 preempts a requirement of a state, political subdivision of a state, or Indian tribe. (b) Under the Federal Railroad Safety Act (49 U.S.C. 20106), administered by the Federal Railroad Administration (see 49 CFR parts 200-244), laws, regulations and orders related to railroad safety, including security, shall be nationally uniform to the extent practicable. A state may adopt, or continue in force, a law, regulation, or order covering the same subject matter as a DOT regulation or order applicable to railroad safety and security (including the requirements in this subpart) only when an additional or more stringent state law, regulation, or order is necessary to eliminate or reduce an essentially local safety or security hazard; is not incompatible with a law, regulation, or order of the United States Government; and does not unreasonably burden interstate commerce. | |||
| 49:49:3.1.1.1.2.2.1.1 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | B | Subpart B—General Design Requirements | § 179.10 Tank mounting. | PHMSA | (a) The manner in which tanks are attached to the car structure shall be approved. The use of rivets to secure anchors to tanks prohibited. (b) [Reserved] | ||||
| 49:49:3.1.1.1.2.2.1.10 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | B | Subpart B—General Design Requirements | § 179.22 Marking. | PHMSA | [Amdt. 179-50, 60 FR 49077, Sept. 21, 1995, as amended by Amdt. 179-50, 61 FR 33256, June 26, 1996; 68 FR 75759, Dec. 31, 2003; 74 FR 1802, Jan. 13, 2009; 85 FR 75716, Nov. 25, 2020] | In addition to any other marking requirement in this subchapter, the following marking requirements apply: (a) Each tank car must be marked according to the requirements in appendix C of the AAR Specifications for Tank Cars (IBR, see § 171.7 of this subchapter). (b) Each tank car that requires a tank-head puncture-resistance system must have the letter “S” substituted for the letter “A” in the specification marking. (c) Each tank car that requires a tank-head puncture-resistance system, a thermal protection system, and a metal jacket must have the letter “J” substituted for the letter “A” or “S” in the specification marking. (d) Each tank car that requires a tank-head puncture-resistance system, a thermal protection system, and no metal jacket must have the letter “T” substituted for the letter “A” or “S” in the specification marking. (e) Each tank car manufactured after March 16, 2009, and before December 28, 2020, to meet the requirements of §§ 173.244(a)(2) or (3) or 173.314(c) or (d) that is marked with the letter “I” in the specification marking, following the test pressure, shall be re-marked with the letter “W” with a delimeter of letter “H” at the tank car's next qualification. (Example: DOT 105J600I would be re-marked as 105H600W.) Each new tank car manufactured after December 28, 2020 shall be marked with the letter “W” following the test pressure and with a delimiter of “H”. (Example: 105H600W). | |||
| 49:49:3.1.1.1.2.2.1.11 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | B | Subpart B—General Design Requirements | § 179.24 Stamping. | PHMSA | [77 FR 37985, June 25, 2012, as amended at 81 FR 35545, June 2, 2016] | (a)(1) After July 25, 2012, to certify compliance with federal requirements, the tank manufacturer must install two identical permanent identification plates, one located on both inboard surfaces of the body bolsters of the tank car. One identification plate must be installed on the right side (AR) of the tank car, and the other must be installed on the back end left side (BL) body bolster webs so that each plate is readily accessible for inspection. The plates must be at least 3/32 inch thick and manufactured from corrosion resistant metal. When the tank jacket (flashing) covers the body bolster web and identification plates, additional identical plates must be installed on the AR and BL corners of the tank in a visible location. Tank cars built before July 25, 2012, may have the plate instead of or in addition to the stamping. (2) Each plate must be stamped, embossed, or otherwise marked by an equally durable method in letters 3/16 inch high with the following information (parenthetical abbreviations may be used, and the AAR form reference is to the applicable provisions of the AAR Specifications for Tank Cars (IBR, see § 171.7 of this subchapter): (i) Tank Manufacturer (Tank MFG): Full name of the car builder as shown on the certificate of construction (AAR form 4-2). (ii) Tank Manufacturer's Serial Number (SERIAL NO): For the specific car. (iii) AAR Number (AAR NO): The AAR number from line 3 of AAR Form 4-2. (iv) Tank Specification (SPECIFICATION): The specification to which the tank was built from line 7 of AAR form 4-2. (v) Tank Shell Material/Head Material (SHELL MATL/HEAD MATL): ASTM or AAR specification of the material used in the construction of the tank shell and heads from lines 15 and 16 of AAR Form 4-2. For Class DOT-113W, DOT-115W, AAR-204W, and AAR-206W, the materials used in the construction of the outer tank shell and heads must be listed. Only list the alloy (e.g., 5154) for aluminum tanks and the type (e.g., 304L or 316L) for stainless steel tanks. (vi) Insulation Materia… | |||
| 49:49:3.1.1.1.2.2.1.2 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | B | Subpart B—General Design Requirements | § 179.11 Welding certification. | PHMSA | (a) Welding procedures, welders and fabricators shall be approved. (b) [Reserved] | ||||
| 49:49:3.1.1.1.2.2.1.3 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | B | Subpart B—General Design Requirements | § 179.12 Interior heater systems. | PHMSA | [Amdt. 179-52, 61 FR 28678, June 5, 1996, as amended by 66 FR 45390, Aug. 28, 2001] | (a) Interior heater systems shall be of approved design and materials. If a tank is divided into compartments, a separate system shall be provided for each compartment. (b) Each interior heater system shall be hydrostatically tested at not less than 13.79 bar (200 psig) and shall hold the pressure for 10 minutes without leakage or evidence of distress. | |||
| 49:49:3.1.1.1.2.2.1.4 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | B | Subpart B—General Design Requirements | § 179.13 Tank car capacity and gross weight limitation. | PHMSA | [74 FR 1802, Jan. 13, 2009, as amended at 75 FR 27216, May 14, 2010; 77 FR 37985, June 25, 2012; 81 FR 35545, June 2, 2016] | Except as provided in this section, tank cars, built after November 30, 1970, or any existing tank cars that are converted, may not exceed 34,500 gallons (130,597 L) capacity or 263,000 pounds (119,295 kg) gross weight on rail. (a) For other than tank cars containing poisonous-by-inhalation material, a tank car may be loaded to a gross weight on rail of up to 286,000 pounds (129,727 kg) upon approval by the Associate Administrator for Safety, Federal Railroad Administration (FRA). Tank cars must conform to the conditions of the approval and must be operated only under controlled interchange conditions agreed to by participating railroads. (b) Tank cars containing poisonous-by-inhalation material meeting the applicable authorized tank car specifications listed in § 173.244(a)(2) or (3) or § 173.314(c) or (d) of this subchapter may have a gross weight on rail of up to 286,000 pounds (129,727 kg). Tank cars containing poisonous-by-inhalation material not meeting the specifications listed in § 173.244(a)(2) or (3) or § 173.314(c) or (d) may be loaded to a gross weight on rail of up to 286,000 pounds (129,727 kg) only upon approval of the Associate Administrator for Safety, Federal Railroad Administration (FRA). Any increase in weight above 263,000 pounds may not be used to increase the quantity of the contents of the tank car. | |||
| 49:49:3.1.1.1.2.2.1.5 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | B | Subpart B—General Design Requirements | § 179.14 Coupler vertical restraint system. | PHMSA | [Amdt. 179-42, 54 FR 38797, Sept. 20, 1989] | (a) Performance standard. Each tank car shall be equipped with couplers capable of sustaining, without disengagement or material failure, vertical loads of at least 200,000 pounds (90,718.5 kg) applied in upward and downward directions in combination with buff loads of 2,000 pounds (907.2 kg), when coupled to cars which may or may not be equipped with couplers having this vertical restraint capability. (b) Test verification. Except as provided in paragraph (d) of this section, compliance with the requirements of paragraph (a) of this section shall be achieved by verification testing of the coupler vertical restraint system in accordance with paragraph (c) of this section. (c) Coupler vertical restraint tests. A coupler vertical restraint system shall be tested under the following conditions: (1) The test coupler shall be tested with a mating coupler (or simulated coupler) having only frictional vertical force resistance at the mating interface; or a mating coupler (or simulated coupler) having the capabilities described in paragraph (a) of this section; (2) The testing apparatus shall simulate the vertical coupler performance at the mating interface and may not interfere with coupler failure or otherwise inhibit failure due to force applications and reactions; and (3) The test shall be conducted as follows: (i) A minimum of 200,000 pounds (90,718.5 kg) vertical downward load shall be applied continuously for at least 5 minutes to the test coupler head simultaneously with the application of a nominal 2,000 pounds (907.2 kg) buff load; (ii) The procedures prescribed in paragraph (c)(3)(i) of this section, shall be repeated with a minimum vertical upward load of 200,000 pounds (90,718.5 kg); and (iii) A minimum of three consecutive successful tests shall be performed for each load combination prescribed in paragraphs (c)(3) (i) and (ii) of this section. A test is successful when a vertical disengagement or material failure does not occur during the application of any of the loads prescribed in this par… | |||
| 49:49:3.1.1.1.2.2.1.6 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | B | Subpart B—General Design Requirements | § 179.15 Pressure relief devices. | PHMSA | [Amdt. 179-52, 61 FR 28678, June 5, 1996, as amended by Amdt. 179-52, 61 FR 50255, Sept. 25, 1996; 62 FR 51561, Oct. 1, 1997; 64 FR 51919, Sept. 27, 1999; 66 FR 45390, Aug. 28, 2001; 68 FR 75759, Dec. 31, 2003] | Except for DOT Class 106, 107, 110, and 113 tank cars, tanks must have a pressure relief device, made of material compatible with the lading, that conforms to the following requirements: (a) Performance standard. Each tank must have a pressure relief device, made of materials compatible with the lading, having sufficient flow capacity to prevent pressure build-up in the tank to no more than the flow rating pressure of the pressure relief device in fire conditions as defined in appendix A of the AAR Specifications for Tank Cars (IBR, see § 171.7 of this subchapter). (b) Settings for reclosing pressure relief devices. (1) Except as provided in paragraph (b)(2) of this section, a reclosing pressure relief valve must have a minimum start-to-discharge pressure equal to the sum of the static head and gas padding pressure and the lading vapor pressure at the following reference temperatures: (i) 46 °C (115 °F) for noninsulated tanks; (ii) 43 °C (110 °F) for tanks having a thermal protection system incorporating a metal jacket that provides an overall thermal conductance at 15.5 °C (60 °F) of no more than 10.22 kilojoules per hour per square meter per degree Celsius (0.5 Btu per hour/per square foot/per degree F) temperature differential; and (iii) 41 °C (105 °F) for insulated tanks. (2)(i) The start-to-discharge pressure of a pressure relief device may not be lower than 5.17 Bar (75 psig) or exceed 33 percent of the minimum tank burst pressure. (ii) Tanks built prior to October 1, 1997 having a minimum tank burst pressure of 34.47 Bar (500 psig) or less may be equipped with a reclosing pressure relief valve having a start-to-discharge pressure of not less than 14.5 percent of the minimum tank burst pressure but no more than 33 percent of the minimum tank burst pressure. (3) The vapor tight pressure of a reclosing pressure relief valve must be at least 80 percent of the start-to-discharge pressure. (4) The flow rating pressure must be 110 percent of the start-to-discharge pressure for tanks having a minimum … | |||
| 49:49:3.1.1.1.2.2.1.7 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | B | Subpart B—General Design Requirements | § 179.16 Tank-head puncture-resistance systems. | PHMSA | [Amdt. 179-50, 60 FR 49077, Sept. 21, 1995, as amended by Amdt. 179-50, 61 FR 33255, June 26, 1996; 66 FR 45390, Aug. 28, 2001; 68 FR 75759, Dec. 31, 2003] | (a) Performance standard. When the regulations in this subchapter require a tank-head puncture-resistance system, the system shall be capable of sustaining, without any loss of lading, coupler-to-tank-head impacts at relative car speeds of 29 km/hour (18 mph) when: (1) The weight of the impact car is at least 119,295 kg (263,000 pounds); (2) The impacted tank car is coupled to one or more backup cars that have a total weight of at least 217,724 kg (480,000 pounds) and the hand brake is applied on the last “backup” car; and (3) The impacted tank car is pressurized to at least 6.9 Bar (100 psig). (b) Verification by testing. Compliance with the requirements of paragraph (a) of this section shall be verified by full-scale testing according to appendix A of this part. (c) Alternative compliance by other than testing. As an alternative to requirements prescribed in paragraph (b) of this section, compliance with the requirements of paragraph (a) of this section may be met by installing full-head protection (shields) or full tank-head jackets on each end of the tank car conforming to the following: (1) The full-head protection (shields) or full tank-head jackets must be at least 1.27 cm (0.5 inch) thick, shaped to the contour of the tank head and made from steel having a tensile strength greater than 379.21 N/mm 2 (55,000 psi). (2) The design and test requirements of the full-head protection (shields) or full tank-head jackets must meet the impact test requirements in Section 5.3 of the AAR Specifications for Tank Cars (IBR, see § 171.7 of this subchapter). (3) The workmanship must meet the requirements in Section C, Part II, Chapter 5, of the AAR Specifications for Design, Fabrication, and Construction of Freight Cars (IBR, see § 171.7 of this subchapter). | |||
| 49:49:3.1.1.1.2.2.1.8 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | B | Subpart B—General Design Requirements | § 179.18 Thermal protection systems. | PHMSA | [Amdt. 179-50, 60 FR 49077, Sept. 21, 1995, as amended by Amdt. 179-50, 61 FR 33256, June 26, 1996; 66 FR 45390, Aug. 28, 2001; 70 FR 56099, Sept. 23, 2005; 72 FR 55696, Oct. 1, 2007] | (a) Performance standard. When the regulations in this subchapter require thermal protection on a tank car, the tank car must have sufficient thermal resistance so that there will be no release of any lading within the tank car, except release through the pressure release device, when subjected to: (1) A pool fire for 100 minutes; and (2) A torch fire for 30 minutes. (b) Thermal analysis. (1) Compliance with the requirements of paragraph (a) of this section shall be verified by analyzing the fire effects on the entire surface of the tank car. The analysis must consider the fire effects on and heat flux through tank discontinuities, protective housings, underframes, metal jackets, insulation, and thermal protection. A complete record of each analysis shall be made, retained, and upon request, made available for inspection and copying by an authorized representative of the Department. The procedures outlined in “Temperatures, Pressures, and Liquid Levels of Tank Cars Engulfed in Fires,” DOT/FRA/OR&D-84/08.11, (1984), Federal Railroad Administration, Washington, DC (available from the National Technical Information Service, Springfield, VA) shall be deemed acceptable for analyzing the fire effects on the entire surface of the tank car. (2) When the analysis shows the thermal resistance of the tank car does not conform to paragraph (a) of this section, the thermal resistance of the tank car must be increased by using a system listed by the Department under paragraph (c) of this section or by testing a new or untried system and verifying it according to appendix B of this part. (c) Systems that no longer require test verification. The Department maintains a list of thermal protection systems that comply with the requirements of appendix B of this part and that no longer require test verification. Information necessary to equip tank cars with one of these systems is available in the PHMSA Records Center, Pipeline and Hazardous Materials Safety Administration, East Building, 1200 New Jersey Avenue, SE., Washi… | |||
| 49:49:3.1.1.1.2.2.1.9 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | B | Subpart B—General Design Requirements | § 179.20 Service equipment; protection systems. | PHMSA | [68 FR 75759, Dec. 31, 2003] | If an applicable tank car specification authorizes location of filling or discharge connections in the bottom shell, the connections must be designed, constructed, and protected according to paragraphs E9.00 and E10.00 of the AAR Specifications for Tank Cars (IBR, see § 171.7 of this subchapter). | |||
| 49:49:3.1.1.1.2.3.1.1 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.100 General specifications applicable to pressure tank car tanks. | PHMSA | |||||
| 49:49:3.1.1.1.2.3.1.10 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.100-12 Manway nozzle, cover and protective housing. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21345, Nov. 6, 1971; 68 FR 75760, Dec. 31, 2003] | (a) Manway nozzles must be of approved design of forged or rolled steel for steel tanks or of fabricated aluminum alloy for aluminum tanks, with an access opening of at least 18 inches inside diameter, or at least 14 inches by 18 inches around or oval. Each nozzle must be welded to the tank and the opening reinforced in an approved manner in compliance with the requirements of AAR Specifications for Tank Cars, appendix E, Figure E10 (IBR, see § 171.7 of this subchapter). (b) Manway cover shall be machined to approved dimensions and be of forged or rolled carbon or alloy steel, rolled aluminum alloy or nickel when required by the lading. Minimum thickness is listed in § 179.101. Manway cover shall be attached to manway nozzle by through or stud bolts not entering tank, except as provided in § 179.103-2(a). (c) Except as provided in § 179.103, protective housing of cast, forged or fabricated approved materials must be bolted to manway cover with not less than twenty 3/4 -inch studs. The shearing value of the bolts attaching protective housing to manway cover must not exceed 70 percent of the shearing value of bolts attaching manway cover to manway nozzle. Housing must have steel sidewalls not less than three-fourths inch in thickness and must be equipped with a metal cover not less than one-fourth inch in thickness that can be securely closed. Housing cover must have suitable stop to prevent cover striking loading and unloading connections and be hinged on one side only with approved riveted pin or rod with nuts and cotters. Openings in wall of housing must be equipped with screw plugs or other closures. | |||
| 49:49:3.1.1.1.2.3.1.11 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.100-13 Venting, loading and unloading valves, measuring and sampling devices. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21345, Nov. 6, 1971; Amdt. 179-40, 52 FR 13046, Apr. 20, 1987; Amdt. 179-42, 54 FR 38798, Sept. 20, 1989; 65 FR 58632, Sept. 29, 2000; 68 FR 48571, Aug. 14, 2003; 68 FR 75760, Dec. 31, 2003] | (a) Venting, loading and unloading valves must be of approved design, made of metal not subject to rapid deterioration by the lading, and must withstand the tank test pressure without leakage. The valves shall be bolted to seatings on the manway cover, except as provided in § 179.103. Valve outlets shall be closed with approved screw plugs or other closures fastened to prevent misplacement. (b) The interior pipes of the loading and unloading valves shall be anchored and, except as prescribed in §§ 173.314(j), 179.102 or 179.103, may be equipped with excess flow valves of approved design. (c) Gauging device, sampling valve and thermometer well are not specification requirements. When used, they shall be of approved design, made of metal not subject to rapid deterioration by the lading, and shall withstand the tank test pressure without leakage. Interior pipes of the gauging device and sampling valve, except as prescribed in §§ 173.314(j), 179.102 or 179.103, may be equipped with excess flow valves of approved design. Interior pipe of the thermometer well shall be anchored in an approved manner to prevent breakage due to vibration. The thermometer well shall be closed by an approved valve attached close to the manway cover, or other approved location, and closed by a screw plug. Other approved arrangements that permit testing thermometer well for leaks without complete removal of the closure may be used. (d) An excess flow valve as referred to in this specification, is a device which closes automatically against the outward flow of the contents of the tank in case the external closure valve is broken off or removed during transit. Excess flow valves may be designed with a by-pass to allow the equalization of pressures. (e) Bottom of tank shell may be equipped with a sump or siphon bowl, or both, welded or pressed into the shell. Such sumps or siphon bowls, if applied, are not limited in size and must be made of cast, forged or fabricated metal. Each sump or siphon bowl must be of good welding quality in conjunc… | |||
| 49:49:3.1.1.1.2.3.1.12 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.100-14 Bottom outlets. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21345, Nov. 6, 1971; Amdt. 179-40, 52 FR 13046, Apr. 20, 1987; 66 FR 45186, Aug. 28, 2001; 68 FR 75760, Dec. 31, 2003] | (a) Bottom outlets for discharge of lading is prohibited, except as provided in § 179.103-3. If indicated in § 179.101, tank may be equipped with a bottom washout of approved construction. If applied, bottom washout shall be in accordance with the following requirements; (1) The extreme projection of the bottom washout equipment may not be more than that allowed by appendix E of the AAR Specifications for Tank Cars (IBR, see § 171.7 of this subchapter). (2) Bottom washout shall be of cast, forged or fabricated metal and shall be fusion-welded to the tank. It shall be of good weldable quality in conjunction with metal of tank. (3) If the bottom washout nozzle extends 6 inches or more from shell of tank, a V-shaped breakage groove shall be cut (not cast) in the upper part of the outlet nozzle at a point immediately below the lowest part of the inside closure seat or plug. In no case may the nozzle wall thickness at the root of the “V” be more than 1/4 -inch. Where the nozzle is not a single piece, provision shall be made for the equivalent of the breakage groove. The nozzle must be of a thickness to insure that accidental breakage will occur at or below the “V” groove or its equivalent. On cars without continuous center sills, the breakage groove or its equivalent may not be more than 15 inches below the tank shell. On cars with continuous center sills, the breakage groove or its equivalent must be above the bottom of the center sill construction. (4) The closure plug and seat shall be readily accessible or removable for repairs. (5) The closure of the washout nozzle must be equipped with a 3/4 -inch solid screw plug. Plug must be attached by at least a 1/4 -inch chain. (6) Joints between closures and their seats may be gasketed with suitable material. (b) [Reserved] | |||
| 49:49:3.1.1.1.2.3.1.13 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.100-16 Attachments. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21346, Nov. 6, 1971] | (a) Reinforcing pads must be used between external brackets and shells if the attachment welds exceed 6 linear inches of 1/4 -inch fillet or equivalent weld per bracket or bracket leg. When reinforcing pads are used, they must not be less than one-fourth inch in thickness, have each corner rounded to a 1-inch minimum radius, and be attached to the tank by continuous fillet welds except for venting provisions. The ultimate shear strength of the bracket-to-reinforcing pad weld must not exceed 85 percent of the ultimate shear strength of the reinforcing pad-to-tank weld. (b) Attachments not otherwise specified shall be applied by approved means. | |||
| 49:49:3.1.1.1.2.3.1.14 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.100-17 Closures for openings. | PHMSA | (a) Closures shall be of approved design and made of metal not subject to rapid deterioration by the lading. Plugs, if used, shall be solid, with NPT threads, and shall be of a length which will screw at least six threads inside the face of fitting or tank. (b) [Reserved] | ||||
| 49:49:3.1.1.1.2.3.1.15 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.100-18 Tests of tanks. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967; 66 FR 45186, Aug. 28, 2001; 68 FR 75760, Dec. 31, 2003] | (a) Each tank shall be tested by completely filling tank and manway nozzle with water or other liquid having similar viscosity, at a temperature which shall not exceed 100 °F during the test; and applying the pressure prescribed in § 179.101. The tank shall hold the prescribed pressure for at least 10 minutes without leakage or evidence of distress. (b) Insulated tanks shall be tested before insulation is applied. (c) Caulking of welded joints to stop leaks developed during the foregoing test is prohibited. Repairs in welded joints shall be made as prescribed in AAR Specifications for Tank Cars, appendix W (IBR, see § 171.7 of this subchapter). (d) Testing of exterior heaters is not a specification requirement. | |||
| 49:49:3.1.1.1.2.3.1.16 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.100-19 Tests of safety relief valves. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, as amended at 62 FR 51561, Oct. 1, 1997] | (a) Each valve shall be tested by air or gas for compliance with § 179.15 before being put into service. (b) [Reserved] | |||
| 49:49:3.1.1.1.2.3.1.17 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.100-20 Stamping. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21346, Nov. 6, 1971; Amdt. 179-52, 61 FR 28679, June 5, 1996; 65 FR 50463, Aug. 18, 2000; 77 FR 37985, June 25, 2012] | (a) To certify that the tank complies with all specification requirements, each tank shall be plainly and permanently stamped in letters and figures at least 3/8 inch high into the metal near the center of both outside heads as follows: (b) After July 25, 2012, newly constructed DOT tank cars must have their DOT specification and other required information stamped plainly and permanently on stainless steel identification plates in conformance with the applicable requirements prescribed in § 179.24(a). Tank cars built before July 25, 2012, may have the identification plates instead of or in addition to the head stamping. | |||
| 49:49:3.1.1.1.2.3.1.18 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.101 Individual specification requirements applicable to pressure tank car tanks. | PHMSA | |||||
| 49:49:3.1.1.1.2.3.1.19 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.101-1 Individual specification requirements. | PHMSA | [Amdt. 179-52, 61 FR 28679, June 5, 1996, as amended at 66 FR 45390, Aug. 28, 2001; 68 FR 75760, Dec. 31, 2003] | In addition to § 179.100, the individual specification requirements are as follows: 1 When steel of 65,000 to 81,000 p.s.i. minimum tensile strength is used, the thickness of plates shall be not less than 5/8 inch, and when steel of 81,000 p.s.i. minimum tensile strength is used, the minimum thickness of plate shall be not less than 9/16 inch. 2 When approved material other than aluminum alloys are used, the thickness shall be not less than 2 1/4 inches. 3 When steel of 65,000 p.s.i. minimum tensile strength is used, minimum thickness of plates shall be not less than 1/2 inch. 4 Tank cars not equipped with a thermal protection or an insulation system used for the transportation of a Class 2 (compressed gas) material must have at least the upper two-thirds of the exterior of the tank, including manway nozzle and all appurtenances in contact with this area, finished with a reflective coat of white paint. 5 For inside diameter of 87 inches or less, the thickness of plates shall be not less than 1/2 inch. 6 See AAR Specifications for Tank Cars, appendix E, E4.01 (IBR, see § 171.7 of this subchapter), and § 179.103-2. 7 When the use of nickel is required by the lading, the thickness shall not be less than two inches. | |||
| 49:49:3.1.1.1.2.3.1.2 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.100-1 Tanks built under these specifications shall comply with the requirements of §§ 179.100, 179.101 and when applicable, §§ 179.102 and 179.103. | PHMSA | |||||
| 49:49:3.1.1.1.2.3.1.20 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.102 Special commodity requirements for pressure tank car tanks. | PHMSA | (a) In addition to §§ 179.100 and 179.101 the following requirements are applicable: (b) [Reserved] | ||||
| 49:49:3.1.1.1.2.3.1.21 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.102-1 Carbon dioxide, refrigerated liquid. | PHMSA | [29 FR 18995, Dec. 29, 1964] | (a) Tank cars used to transport carbon dioxide, refrigerated liquid must comply with the following special requirements: (1) All plates for tank, manway nozzle and anchorage of tanks must be made of carbon steel conforming to ASTM A 516/A 516M (IBR, see § 171.7 of this subchapter), Grades 55, 60, 65, or 70, or AAR Specification TC 128-78, Grade B. The ASTM A 516/A 516M plate must also meet the Charpy V-Notch test requirements of ASTM A 20/A 20M (see table 16) (IBR, see § 171.7 of this subchapter) in the longitudinal direction of rolling. The TC 128 plate must also meet the Charpy V-Notch energy absorption requirements of 15 ft.-lb. minimum average for 3 specimens, and 10 ft.-lb. minimum for one specimen, at minus 50 °F in the longitudinal direction of rolling in accord with ASTM A 370 (IBR, see § 171.7 of this subchapter). Production-welded test plates prepared as required by W4.00 of AAR Specifications for Tank Cars, appendix W (IBR, see § 171.7 of this subchapter), must include impact test specimens of weld metal and heat-affected zone. As an alternate, anchor legs may be fabricated of stainless steel, ASTM A 240/A 240M Types 304, 304L, 316 or 316L, for which impact tests are not required. (2)-(6) [Reserved] (b) [Reserved] | |||
| 49:49:3.1.1.1.2.3.1.22 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.102-2 Chlorine. | PHMSA | [Amdt. 179-7, 36 FR 14697, Aug. 10, 1971; Amdt. 179-10, 36 FR 21346, Nov. 6, 1971, as amended by Amdt. 179-25, 44 FR 20433, Apr. 5, 1979; Amdt. 179-40, 52 FR 13046, Apr. 20, 1987; Amdt. 179-45, 55 FR 52728, Dec. 21, 1990; Amdt. 179-52, 61 FR 28680, June 5, 1996; 68 FR 75760, Dec. 31, 2003] | (a) Each tank car used to transport chlorine must comply with all of the following: (1) Tanks must be fabricated from carbon steel complying with ASTM Specification A 516 (IBR, see § 171.7 of this subchapter), Grade 70, or AAR Specification TC 128, Grade A or B. (2)-(3) [Reserved] (b) [Reserved] | |||
| 49:49:3.1.1.1.2.3.1.23 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.102-3 Materials poisonous by inhalation. | PHMSA | [74 FR 1802, Jan. 13, 2009] | (a) Each tank car built after March 16, 2009 for the transportation of a material poisonous by inhalation must, in addition to the requirements prescribed in § 179.100-12(c), enclose the service equipment within a protective housing and cover. (1) Tank cars must be equipped with a top fitting protection system and nozzle capable of sustaining, without failure, a rollover accident at a speed of 9 miles per hour, in which the rolling protective housing strikes a stationary surface assumed to be flat, level and rigid and the speed is determined as a linear velocity, measured at the geometric center of the loaded tank car as a transverse vector. Failure is deemed to occur when the deformed protective housing contacts any of the service equipment or when the tank retention capability is compromised. (2) As an alternative to the tank car top fitting protection system requirements in paragraph (a)(1) of this section, the tank car may be equipped with a system that prevents the release of product from any top fitting in the case of an accident where any top fitting would be sheared off. The tank nozzle must meet the performance standard in paragraph (a)(1) of this section and only mechanically operated excess flow devices are authorized. (b) An application for approval of a tank car built in accordance with § 173.244(a)(3) or § 173.314(d) must include a demonstration, through engineering analysis, that the tank jacket and support structure system, including any anchors and support devices, is capable of withstanding a 6 mile per hour coupling without jacket shift such that results in damage to the nozzle. | |||
| 49:49:3.1.1.1.2.3.1.24 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.102-4 Vinyl fluoride, stabilized. | PHMSA | [Amdt. 179-32, 48 FR 27707, June 16, 1983, as amended at 49 FR 24317, June 12, 1984; 49 FR 42736, Oct. 24, 1984; Amdt. 179-45, 55 FR 52728, Dec. 21, 1990; Amdt. 179-52, 61 FR 28680, June 5, 1996; 65 FR 58632, Sept. 29, 2000; 66 FR 33452, June 21, 2001; 66 FR 45186, 45390, Aug. 28, 2001; 67 FR 51660, Aug. 8, 2002; 68 FR 75758, 75760 Dec. 31, 2003] | Each tank used to transport vinyl fluoride, stabilized, must comply with the following special requirements: (a) All plates for the tank must be fabricated of material listed in paragraph (a)(2) of this section, and appurtenances must be fabricated of material listed in paragraph (a)(1) or (a)(2) of this section. (1) Stainless steel, ASTM A 240/A 240M (IBR, see § 171.7 of this subchapter), Type 304, 304L, 316 or 316L, in which case impact tests are not required; or (2) Steel complying with ASTM Specification A 516 (IBR, see § 171.7 of this subchapter); Grade 70; ASTM Specification A 537 (IBR, see § 171.7 of this subchapter), Class 1; or AAR Specification TC 128, Grade B, in which case impact tests must be performed as follows: (i) ASTM A 516/A 516M and A 537/A 537M material must meet the Charpy V-Notch test requirements, in longitudinal direction of rolling, of ASTM A 20/A 20M (IBR, see § 171.7 of this subchapter). (ii) AAR Specification TC 128 material must meet the Charpy V-Notch test requirements, in longitudinal direction of rolling, of 15 ft.-lb. minimum average for 3 specimens, with a 10 ft.-lb. minimum for any one specimen, at minus 50 °F or colder, in accordance with ASTM A 370 (IBR, see § 171.7 of this subchapter). (iii) Production welded test plates must— (A) Be prepared in accordance with AAR Specifications for Tank Cars, appendix W, W4.00 (IBR, see § 171.7 of this subchapter); (B) Include impact specimens of weld metal and heat affected zone prepared and tested in accordance with AAR Specifications for Tank Cars, appendix W, W9.00; and (C) Meet the same impact requirements as the plate material. (b) Insulation must be of approved material. (c) Excess flow valves must be installed under all liquid and vapor valves, except safety relief valves. (d) A thermometer well may be installed. (e) Only an approved gaging device may be installed. (f) A pressure gage may be installed. (g) Aluminum, copper, silver, zinc, or an alloy containing any of these metals may not be used in the tank constru… | |||
| 49:49:3.1.1.1.2.3.1.25 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.102-17 Hydrogen chloride, refrigerated liquid. | PHMSA | [Amdt. 179-32, 48 FR 27708, June 16, 1983, as amended at 48 FR 50441, Nov. 1, 1983; 49 FR 24317, June 12, 1984; 49 FR 42736, Oct. 24, 1984; Amdt. 179-45, 55 FR 52728, Dec. 21, 1990; 66 FR 45390, Aug. 28, 2001; 67 FR 51660, Aug. 8, 2002; 68 FR 75758, 75760, Dec. 31, 2003; 74 FR 1802, Jan. 13, 2009] | Each tank car used to transport hydrogen chloride, refrigerated liquid must comply with the following special requirements: (a) The tank car must comply with Specification DOT-105J600W and be designed for loading at minus 50 °F. or colder. (b) All plates for the tank must be fabricated of material listed in paragraph (b)(2) of this section, and appurtenances must be fabricated of material listed in paragraph (b)(1) or (b)(2) of this section. (1) Stainless steel, ASTM A 240/A 240M (IBR, see § 171.7 of this subchapter), Type 304, 304L, 316, or 316L, in which case impact tests are not required; or (2) Steel conforming to ASTM A 516/A 516M (IBR, see § 171.7 of this subchapter), Grade 70; ASTM A 537/A 537M, (IBR, see § 171.7 of this subchapter) Class 1; or AAR Specification TC 128, Grade B in which case impact tests must be performed as follows: (i) ASTM A 516/A 516M and A 537/A 537M material must meet the Charpy V-notch test requirements, in longitudinal direction of rolling, of ASTM A 20/A 20M (IBR, see § 171.7 of this subchapter). (ii) AAR Specification TC 128 material must meet the Charpy V-notch test requirements, in longitudinal direction of rolling of 15 ft.-lb. minimum average for 3 specimens, with a 10 ft.-lb. minimum for any one specimen, at minus 50 °F or colder, in accordance with ASTM A 370 (IBR, see § 171.7 of this subchapter). (iii) Production welded test plates must— (A) Be prepared in accordance with AAR Specifications for Tank Cars, appendix W, W4.00 (IBR, see § 171.7 of this subchapter); (B) include impact test specimens of weld metal and heat affected zone prepared and tested in accordance with AAR Specifications for Tank Cars, appendix W, W9.00; and (C) meet the same impact requirements as the plate material. (c) Insulation must be of approved material. (d) Pressure relief valves must be trimmed with monel or other approved material and equipped with a rupture disc of silver, polytetrafluoroethylene coated monel, or tantalum. Each pressure relief device shall have the space between t… | |||
| 49:49:3.1.1.1.2.3.1.26 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.103 Special requirements for class 114A * * * tank car tanks. | PHMSA | (a) In addition to the applicable requirements of §§ 179.100 and 179.101 the following requirements shall be complied with: (b) [Reserved] | ||||
| 49:49:3.1.1.1.2.3.1.27 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.103-1 Type. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-50, 60 FR 49077, Sept. 21, 1995] | (a) Tanks built under this section may be of any approved cross section. (b) Any portion of the tank shell not circular in cross section shall have walls of such thickness and be so reinforced that the stresses in the walls caused by a given internal pressure are no greater than the circumferential stresses which would exist under the same internal pressure in the wall of a tank of circular cross section designed in accordance with paragraphs § 179.100-6 (a) and (b), but in no case shall the wall thickness be less than that specified in § 179.101. (c) [Reserved] (d) Valves and fittings need not be mounted on the manway cover. (e) One opening may be provided in each head for use in purging the tank interior. | |||
| 49:49:3.1.1.1.2.3.1.28 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.103-2 Manway cover. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-50, 60 FR 49077, Sept. 21, 1995] | (a) The manway cover must be an approved design. (b) If no valves or measuring and sampling devices are mounted on manway cover, no protective housing is required. | |||
| 49:49:3.1.1.1.2.3.1.29 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.103-3 Venting, loading and unloading valves, measuring and sampling devices. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21348, Nov. 6, 1971] | (a) Venting, loading and unloading valves, measuring and sampling devices, when used, shall be attached to a nozzle or nozzles on the tank shell or heads. (b) These valves and appurtenances must be grouped in one location and, except as provided in § 179.103-5, must be equipped with a protective housing with cover, or may be recessed into tank shell with cover. An additional set grouped in another location may be provided. Protective housing with cover, when used, must have steel sidewalls not less than three-fourths inch in thickness and a metal cover not less than one-fourth inch in thickness that can be securely closed. Underframe sills are an acceptable alternate to the protective housing cover, provided the arrangement is of approved design. For fittings recessed into tank shell, protective cover must be metal and not less than one-fourth inch in thickness. (c) When tank car is used to transport liquefied flammable gases, the interior pipes of the loading, unloading, and sampling valves must be equipped with excess flow valves of approved design except when quick closing internal valves of approved design are used. When the interior pipe of the gaging device provides a means for the passage of lading from the interior to the exterior of the tank, it must be equipped with an excess flow valve of approved design or with an orifice not exceeding 0.060 inch. | |||
| 49:49:3.1.1.1.2.3.1.3 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.100-3 Type. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21344, Nov. 6, 1971; 65 FR 58632, Sept. 29, 2000; 74 FR 1802, Jan. 13, 2009] | (a) Tanks built under this specification shall be fusion-welded with heads designed convex outward. Except as provided in § 179.103 they shall be circular in cross section, shall be provided with a manway nozzle on top of the tank of sufficient size to permit access to the interior, a manway cover to provide for the mounting of all valves, measuring and sampling devices, and a protective housing. Other openings in the tank are prohibited, except as provided in part 173 of this chapter, §§ 179.100-14, 179.101-1, 179.102 or § 179.103. (b) Head shields and shells of tanks built under this specification must be normalized. Tank car heads must be normalized after forming unless specific approval is granted for a facility's equipment and controls. | |||
| 49:49:3.1.1.1.2.3.1.30 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.103-4 Safety relief devices and pressure regulators. | PHMSA | [Amdt. 179-10, 36 FR 21348, Nov. 6, 1971] | (a) Safety relief devices and pressure regulators must be located on top of the tank near the center of the car on a nozzle, mounting plate or recess in the shell. Through or stud bolts, if used, must not enter the tank. (b) Metal guard of approved design must be provided to protect safety relief devices and pressure regulators from damage. | |||
| 49:49:3.1.1.1.2.3.1.31 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.103-5 Bottom outlets. | PHMSA | [Amdt. 179-10, 36 FR 21348, Nov. 6, 1971, as amended by Amdt. 179-40, 52 FR 13046, Apr. 20, 1987; Amdt. 179-41, 52 FR 36672, Sept. 30, 1987; Amdt. 179-50, 60 FR 49077, Sept. 21, 1995; Amdt. 179-52, 61 FR 28680, June 5, 1996; Amdt. 179-53, 61 FR 51342, Oct. 1, 1996; 66 FR 45186, Aug. 28, 2001; 68 FR 75761, Dec. 31, 2003] | (a) In addition to or in place of the venting, loading and unloading valves, measuring and sampling devices as prescribed in § 179.103-3, tanks may be equipped with approved bottom outlet valves. If applied, bottom outlet valves must meet the following requirements: (1) On cars with center sills, a ball valve may be welded to the outside bottom of the tank or mounted on a pad or nozzle with a tongue and groove or male and female flange attachment, but in no case shall the breakage groove or equivalent extend below the bottom flange of the center sill. On cars without continuous center sills, a ball valve may be welded to the outside bottom of the tank or mounted with a tongue and groove or male and female flange attachment on a pad attached to the outside bottom of the tank. The mounting pad must have a maximum thickness of 2 1/2 inches measured on the longitudinal centerline of the tank. The valve operating mechanism must be provided with a suitable locking arrangement to insure positive closure during transit. (2) When internal bottom outlet valve is used in liquefied flammable gas service, the outlet of the valve must be equipped with an excess flow valve of approved design, except when a quick-closing internal valve of approved design is used. Protective housing is not required. (3) Bottom outlet must be equipped with a liquid tight closure at its lower end. (b) Bottom outlet equipment must be of approved design and must meet the following requirements: (1) The extreme projection of the bottom outlet equipment may not be more than allowed by appendix E of the AAR Specifications for Tank Cars (IBR, see § 171.7 of this subchapter). All bottom outlet reducers and closures and their attachments shall be secured to the car by at least 3/8 inch chain, or its equivalent, except that bottom outlet closure plugs may be attached by 1/4 inch chain. When the bottom outlet closure is of the combination cap and valve type, the pipe connection to the valve shall be closed by a plug, cap, or approved quick coupl… | |||
| 49:49:3.1.1.1.2.3.1.4 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.100-4 Insulation. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21344, Nov. 6, 1971; Amdt. 179-50, 60 FR 49077, Sept. 21, 1995] | (a) If insulation is applied, the tank shell and manway nozzle must be insulated with an approved material. The entire insulation must be covered with a metal jacket of a thickness not less than 11 gauge (0.1196 inch) nominal (Manufacturers' Standard Gauge) and flashed around all openings so as to be weather-tight. The exterior surface of a carbon steel tank, and the inside surface of a carbon steel jacket must be given a protective coating. (b) If insulation is a specification requirement, it shall be of sufficient thickness so that the thermal conductance at 60 °F is not more than 0.075 Btu per hour, per square foot, per degree F temperature differential. If exterior heaters are attached to tank, the thickness of the insulation over each heater element may be reduced to one-half that required for the shell. | |||
| 49:49:3.1.1.1.2.3.1.5 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.100-6 Thickness of plates. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21344, Nov. 6, 1971] | (a) The wall thickness after forming of the tank shell and heads must not be less than that specified in § 179.101, nor that calculated by the following formula: t = Pd / 2SE Where: d = Inside diameter in inches; E = 1.0 welded joint efficiency; except for heads with seams = 0.9; P = Minimum required bursting pressure in p.s.i.; S = Minimum tensile strength of plate material in p.s.i., as prescribed in § 179.100-7; t = Minimum thickness of plate in inches after forming. Where: d = Inside diameter in inches; E = 1.0 welded joint efficiency; except for heads with seams = 0.9; P = Minimum required bursting pressure in p.s.i.; S = Minimum tensile strength of plate material in p.s.i., as prescribed in § 179.100-7; t = Minimum thickness of plate in inches after forming. (b) If plates are clad with material having tensile strength properties at least equal to the base plate, the cladding may be considered a part of the base plate when determining thickness. If cladding material does not have tensile strength at least equal to the base plate, the base plate alone shall meet the thickness requirement. (c) When aluminum plate is used, the minimum width of bottom sheet of tank shall be 60 inches, measured on the arc, but in all cases the width shall be sufficient to bring the entire width of the longitudinal welded joint, including welds, above the bolster. | |||
| 49:49:3.1.1.1.2.3.1.6 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.100-7 Materials. | PHMSA | [Amdt. 179-10, 36 FR 21344, Nov. 6, 1971, as amended by Amdt. 179-32, 48 FR 27707, June 16, 1983; Amdt. 179-47, 58 FR 50237, Sept. 24, 1993; Amdt. 179-52, 61 FR 28679, June 5, 1996; Amdt. 179-52, 61 FR 50255, Sept. 25, 1996; 66 FR 45186, Aug. 28, 2001; 67 FR 51660, Aug. 8, 2002; 68 FR 75759, Dec. 31, 2003] | (a) Steel plate: Steel plate materials used to fabricate tank shell and manway nozzle must comply with one of the following specifications with the indicated minimum tensile strength and elongation in the welded condition. The maximum allowable carbon content must be 0.31 percent when the individual specification allows carbon greater than this amount. The plates may be clad with other approved materials. 1 Maximum stresses to be used in calculations. 2 These specifications are incorporated by reference (IBR, see § 171.7 of this subchapter). (b) Aluminum alloy plate: Aluminum alloy plate material used to fabricate tank shell and manway nozzle must be suitable for fusion welding and must comply with one of the following specifications (IBR, see § 171.7 of this subchapter) with its indicated minimum tensile strength and elongation in the welded condition. * * * 1 For fabrication, the parent plate material may be 0, H112, or H32 temper, but design calculations must be based on minimum tensile strength shown. 2 0 temper only. 3 Weld filler metal 5556 must not be used. 4 Maximum stress to be used in calculations. (c) High alloy steel plate. (1) High alloy steel plate must conform to the following specifications: 1 Maximum stresses to be used in calculations. (2)(i) High alloy steels used to fabricate tank must be tested in accordance with the following procedures in ASTM A 262, “Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steel” (IBR, see § 171.7 of this subchapter), and must exhibit corrosion rates not exceeding the following: * * * (ii) Type 304L and 316L test specimens must be given a sensitizing treatment prior to testing. (d) All attachments welded to tank shell must be of approved material which is suitable for welding to the tank. | |||
| 49:49:3.1.1.1.2.3.1.7 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.100-8 Tank heads. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated, 32 FR 5606, Apr. 5, 1967 and amended by Amdt. 179-12, 39 FR 15038, Apr. 30, 1974] | (a) The tank head shape shall be an ellipsoid of revolution in which the major axis shall equal the diameter of the shell adjacent to the head and the minor axis shall be one-half the major axis. (b) Each tank head made from steel which is required to be “fine grain” by the material specification, which is hot formed at a temperature exceeding 1700 °F., must be normalized after forming by heating to a temperature between 1550° and 1700 °F., by holding at that temperature for at least 1 hour per inch of thickness (30-minute minimum), and then by cooling in air. If the material specification requires quenching and tempering, the treatment specified in that specification must be used instead of the one specified above. | |||
| 49:49:3.1.1.1.2.3.1.8 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.100-9 Welding. | PHMSA | [29 FR 18995, Dec. 29, 1964, as amended at 65 FR 58632, Sept. 29, 2000; 68 FR 75759, Dec. 31, 2003] | (a) All joints shall be fusion-welded in compliance with the requirements of AAR Specifications for Tank Cars, appendix W (IBR, see § 171.7 of this subchapter). Welding procedures, welders and fabricators shall be approved. (b) [Reserved] | |||
| 49:49:3.1.1.1.2.3.1.9 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | C | Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120) | § 179.100-10 Postweld heat treatment. | PHMSA | [Amdt. 179-10, 36 FR 21345, Nov. 6, 1971, as amended by Amdt. 179-47, 58 FR 50238, Sept. 24, 1993; Amdt. 179-52, 61 FR 28679, June 5, 1996; 67 FR 51660, Aug. 8, 2002; 68 FR 75758, 75759, Dec. 31, 2003] | (a) After welding is complete, steel tanks and all attachments welded thereto must be postweld heat treated as a unit in compliance with the requirements of AAR Specifications for Tank Cars, appendix W (IBR, see § 171.7 of this subchapter). (b) For aluminum tanks, postweld heat treatment is prohibited. (c) Tank and welded attachments, fabricated from ASTM A 240/A 240M (IBR, see § 171.7 of this subchapter), Type 304L or Type 316L materials do not require postweld heat treatment, but these materials do require a corrosion resistance test as specified in § 179.100-7(c)(2). | |||
| 49:49:3.1.1.1.2.4.1.1 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.200 General specifications applicable to non-pressure tank car tanks (Class DOT-111, DOT-117). | PHMSA | |||||
| 49:49:3.1.1.1.2.4.1.10 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.200-11 Postweld heat treatment. | PHMSA | [68 FR 75761, Dec. 31, 2003] | When specified in § 179.201-1, after welding is complete, postweld heat treatment must be in compliance with the requirements of AAR Specifications for Tank Cars, appendix W (IBR, see § 171.7 of this subchapter). | |||
| 49:49:3.1.1.1.2.4.1.11 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.200-13 Manway ring or flange, pressure relief device flange, bottom outlet nozzle flange, bottom washout nozzle flange and other attachments and openings. | PHMSA | [Amdt. 179-40, 52 FR 13047, Apr. 20, 1987, as amended at 68 FR 75761, Dec. 31, 2003] | (a) These attachments shall be fusion welded to the tank and reinforced in an approved manner in compliance with the requirements of appendix E, figure 10, of the AAR Specifications for Tank Cars (IBR, see § 171.7 of this subchapter). (b) The opening in the manway ring must be at least 16 inches in diameter except that acid resistant lined manways must be at least 18 inches in diameter before lining. (c) The manway ring or flange, shall be made of cast, forged or fabricated metal. The metal of the dome, tank, or nozzle must be compatible with the manway ring or flange, so that they may be welded together. (d) The openings for the manway or other fittings shall be reinforced in an approved manner. | |||
| 49:49:3.1.1.1.2.4.1.12 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.200-14 Expansion capacity. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21350, Nov. 6, 1971; Amdt. 179-28, 46 FR 49906, Oct. 8, 1981; Amdt. 179-52, 61 FR 28680, June 5, 1996; 66 FR 45186, 45390, Aug. 28, 2001; 68 FR 48571, Aug. 14, 2003] | (a) Tanks shall have expansion capacity as prescribed in this subchapter. This capacity shall be provided in the tank for Class DOT-111A cars, or in a dome for Class DOT-103 and 104 type cars. (b) For tank cars having an expansion dome, the expansion capacity is the total capacity of the tank and dome combined. The capacity of the dome shall be measured from the inside top of shell of tank to the inside top of dome or bottom of any vent pipe projecting inside of dome, except that when a pressure relief device is applied to side of dome, the effective capacity of the dome shall be measured from top of the pressure relief device opening inside of dome to inside top of shell of tank. (c) The opening in the tank shell within the dome shall be at least 29 inches in diameter. When the opening in the tank shell exceeds 30 inches in diameter, the opening shall be reinforced in an approved manner. This additional reinforcement may be accomplished by the use of a dome opening of the flued-type as shown in appendix E, Figure E 10C of the AAR Specifications for Tank Cars or by the use of reinforcing as outlined in Appendix E, E3.04 and Figures E10K and E10L. When the opening in the tank shell is less than the inside diameter of the dome, and the dome pocket is not closed off in an approved manner, dome pocket drain holes shall be provided in the tank shell with nipples projecting inside the tank at least 1 inch. (d) The dome head shall be of approved contour and shall be designed for pressure on concave side. (e) Aluminum alloy domes: (1) The dome shell thickness shall be calculated by the formula in § 179.200-6(a). (2) The dome head may be an ellipsoid of revolution in which the major axis shall be equal to the diameter of the dome shell and the minor axis shall be one-half the major axis. The thickness in this case shall be determined by using formula in § 179.200-6(a). (3) The dome head, if dished, must be dished to a radius not exceeding 96 inches. Thickness of dished dome head must be calculated by the formula in … | |||
| 49:49:3.1.1.1.2.4.1.13 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.200-15 Closures for manways. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21350, Nov. 6, 1971; Amdt. 179-37, 50 FR 11066, Mar. 19, 1985; 68 FR 75762, Dec. 31, 2003] | (a) Manway covers must be of approved type. (b) Manway covers shall be designed to provide a secure closure of the manway. (c) Manway covers must be of approved cast, forged, or fabricated metals. Malleable iron, if used, must comply with ASTM A 47 (IBR, see § 171.7 of this subchapter), Grade 35018. Cast iron manway covers must not be used. (d) All joints between manway covers and their seats shall be made tight against leakage of vapor and liquid by use of gaskets of suitable material. (e) For other manway cover requirements see § 179.201-1. | |||
| 49:49:3.1.1.1.2.4.1.14 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.200-16 Gauging devices, top loading and unloading devices, venting and air inlet devices. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21350, Nov. 6, 1971; Amdt. 179-52, 61 FR 28680, June 5, 1996; 69 FR 54047, Sept. 7, 2004] | (a) When installed, these devices shall be of an approved design which will prevent interchange with any other fixture, and be tightly closed. Unloading pipes shall be securely anchored within the tank. Each tank or compartment may be equipped with one separate air connection. (b) When the characteristics of the commodity for which the car is authorized are such that these devices must be equipped with valves or fittings to permit the loading and unloading of the contents, these devices, including valves, shall be of an approved design, and be provided with a protective housing except when plug or ball type valves with operating handles removed are used. Provision shall be made for closing pipe connections of valves. (c) A tank may be equipped with a vacuum relief valve of an approved design. Protective housing is not required. (d) When using a visual gauging device on a car with a hinged manway cover, an outage scale visible through the manway opening shall be provided. If loading devices are applied to permit tank loading with cover closed, a telltale pipe may be provided. Telltale pipe shall be capable of determining that required outage is provided. Pipe shall be equipped with 1/4 inch minimum NPT control valve mounted outside tank and enclosed within a housing. Other approved devices may be used in lieu of outage scale or telltale pipe. (e) Bottom of tank shell may be equipped with a sump or siphon bowl, or both, welded or pressed into the shell. Such sumps or siphon bowls, if applied are not limited in size and must be made of cast, forged, or fabricated metal. Each sump or siphon bowl must be of good welding quality in conjunction with the metal of the tank shell. When sump or siphon bowl is pressed in the bottom of the tank shell, the wall thickness of the pressed section must not be less than that specified for the shell. The section of a circular cross section tank to which a sump or siphon bowl is attached need not comply with the out-of-roundness requirement specified in appendix W, W14.06, of … | |||
| 49:49:3.1.1.1.2.4.1.15 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.200-17 Bottom outlets. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21351, Nov. 6, 1971; Amdt. 179-40, 52 FR 13047, Apr. 20, 1987; 68 FR 75762, Dec. 31, 2003] | (a) If indicated in § 179.201-1, tank may be equipped with bottom outlet. Bottom outlet, if applied, must comply with the following requirements: (1) The extreme projection of the bottom outlet equipment may not be more than that allowed by appendix E of the AAR Specifications for Tank Cars (IBR, see § 171.7 of this subchapter). All bottom outlet reducers and closures and their attachments shall be secured to the car by at least 3/8 -inch chain, or its equivalent, except that the bottom outlet closure plugs may be attached by 1/4 -inch chain. When the bottom outlet closure is of the combination cap and valve type, the pipe connection to the valve shall be closed by a plug, cap, or approved quick coupling device. The bottom outlet equipment should include only the valve, reducers and closures that are necessary for the attachment of unloading fixtures. The permanent attachment of supplementary exterior fittings shall be approved by the AAR Committee on Tank Cars. (2) Bottom outlet must be of approved construction, and be provided with a liquid-tight closure at its lower end. (3) On cars with center sills, a ball valve may be welded to the outside bottom of the tank or mounted on a pad or nozzle with a tongue and groove or male and female flange attachment. In no case shall the breakage groove or equivalent extend below the bottom flange of the center sill. On cars without continuous center sills, a ball valve may be welded to the outside bottom of the tank or mounted with a tongue and groove or male and female flange attachment on a pad attached to the outside bottom of the tank. The mounting pad must have a maximum thickness of 2 1/2 inches measured on the longitudinal centerline of the tank. The valve operating mechanism must be provided with a suitable locking arrangement to insure positive closure during transit. (4) The valve operating mechanism for valves applied to the interior of the tank, and outlet nozzle construction, must insure against the unseating of the valve due to stresses or shocks inc… | |||
| 49:49:3.1.1.1.2.4.1.16 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.200-19 Reinforcements, when used, and appurtenances not otherwise specified. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21351, Nov. 6, 1971] | (a) All attachments to tank and dome shall be applied by approved means. Rivets if used shall be caulked inside and outside. (b) Reinforcing pads must be used between external brackets and shells if the attachment welds exceed 6 lineal inches of 1/4 -inch fillet or equivalent weld per bracket or bracket leg. When reinforcing pads are used, they must not be less than one-fourth inch in thickness, have each corner rounded to a 1 inch minimum radius, and be attached to the tank by continuous fillet welds except for venting provisions. The ultimate shear strength of the bracket to reinforcing pad weld must not exceed 85 percent of the ultimate shear strength of the reinforcing pad to tank weld. | |||
| 49:49:3.1.1.1.2.4.1.17 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.200-21 Closures for openings. | PHMSA | (a) All plugs shall be solid, with NPT threads, and shall be of a length which will screw at least 6 threads inside the face of fitting or tank. Plugs, when inserted from the outside of tank heads, shall have the letter “S” at least 3/8 inch in size stamped with steel stamp or cast on the outside surface to indicate the plug is solid. (b) [Reserved] | ||||
| 49:49:3.1.1.1.2.4.1.18 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.200-22 Test of tanks. | PHMSA | [29 FR 18995, Dec. 29, 1964, as amended at 68 FR 75762, Dec. 31, 2003] | (a) Each tank shall be tested by completely filling the tank and dome or nozzles with water, or other liquid having similar viscosity, of a temperature which shall not exceed 100 °F. during the test; and applying the pressure prescribed in § 179.201-1. Tank shall hold the prescribed pressure for at least 10 minutes without leakage or evidence of distress. All rivets and closures, except safety relief valves or safety vents, shall be in place when test is made. (b) Insulated tanks shall be tested before insulation is applied. (c) Rubber-lined tanks shall be tested before rubber lining is applied. (d) Caulking of welded joints to stop leaks developed during the foregoing tests is prohibited. Repairs in welded joints shall be made as prescribed in AAR Specifications for Tank Cars, appendix W (IBR, see § 171.7 of this subchapter). | |||
| 49:49:3.1.1.1.2.4.1.19 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.200-23 Tests of pressure relief valves. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, as amended at 62 FR 51561, Oct. 1, 1997] | (a) Each valve shall be tested by air or gas for compliance with § 179.15 before being put into service. (b) [Reserved] | |||
| 49:49:3.1.1.1.2.4.1.2 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.200-1 Tank built under these specifications must meet the applicable requirements in this part. | PHMSA | |||||
| 49:49:3.1.1.1.2.4.1.20 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.200-24 Stamping. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21351, Nov. 6, 1971; Amdt. 179-52, 61 FR 28680, June 5, 1996; 68 FR 48571, Aug. 14, 2003; 77 FR 37985, June 25, 2012] | (a) To certify that the tank complies with all specification requirements, each tank shall be plainly and permanently stamped in letters and figures at least 3/8 inch high into the metal near the center of both outside heads as follows: (b) On Class DOT-111 tank cars, the last numeral of the specification number may be omitted from the stamping; for example, DOT-111A100W. (c) After July 25, 2012, newly constructed DOT tank cars must have their DOT specification and other required information stamped plainly and permanently on stainless steel identification plates in conformance with the applicable requirements prescribed in § 179.24(a). Tank cars built before July 25, 2012, may have the identification plates instead of or in addition to the head stamping. | |||
| 49:49:3.1.1.1.2.4.1.21 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.201 Individual specification requirements applicable to non-pressure tank car tanks. | PHMSA | |||||
| 49:49:3.1.1.1.2.4.1.22 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.201-1 Individual specification requirements. | PHMSA | [Amdt. 179-52, 61 FR 28680, June 5, 1996, as amended by 66 FR 45390, Aug. 28, 2001; 68 FR 48571, Aug. 14, 2003] | In addition to § 179.200, the individual specification requirements are as follows: 1 Tanks marked “ALW” are constructed from aluminum alloy plate; “AN” nickel plate; “CW,” “DW,” “EW,” “W6,” and “W7” high alloy steel or manganese-molybdenum steel plate; and those marked “BW” or “W5” must have an interior lining that conforms to § 179.201-3. | |||
| 49:49:3.1.1.1.2.4.1.23 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.201-2 [Reserved] | PHMSA | |||||
| 49:49:3.1.1.1.2.4.1.24 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.201-3 Lined tanks. | PHMSA | [Amdt. 179-10, 36 FR 21352, Nov. 6, 1971, as amended at 66 FR 45186, Aug. 28, 2001; 68 FR 48571, Aug. 14, 2003] | (a) Rubber-lined tanks. (1) Each tank or each compartment thereof must be lined with acid-resistant rubber or other approved rubber compound vulcanized or bonded directly to the metal tank, to provide a nonporous laminated lining, at least 5/32 -inch thick, except overall rivets and seams formed by riveted attachments in the lining must be double thickness. The rubber lining must overlap at least 1 1/2 inches at all edges which must be straight and be beveled to an angle of approximately 45°, or butted edges of lining must be sealed with a 3-inch minimum strip of lining having 45° beveled edges. (2) As an alternate method, the lining may be joined with a skived butt seam then capped with a separate strip of lining 3 inches wide having 45° beveled edges. An additional rubber reinforcing pad at least 4 1/2 feet square and at least 1/2 -inch thick must be applied by vulcanizing to the lining on bottom of tank directly under the manway opening. The edges of the rubber pad must be beveled to an angle of approximately 45°. An opening in this pad for sump is permitted. No lining must be under tension when applied except due to conformation over rivet heads. Interior of tank must be free from scale, oxidation, moisture, and all foreign matter during the lining operation. (3) Other approved lining materials may be used provided the material is resistant to the corrosive or solvent action of the lading in the liquid or gas phase and is suitable for the service temperatures. (b) Before a tank car tank is lined with rubber, or other rubber compound, a report certifying that the tank and its equipment have been brought into compliance with spec. DOT-111A60W5 or 111A100W5 must be furnished by car owner to the party who is to apply the lining. A copy of this report in approved form, certifying that tank has been lined in compliance with all requirements of one of the above specifications, must be furnished by party lining tank to car owner. Reports of the latest lining application must be retained by the car owner … | |||
| 49:49:3.1.1.1.2.4.1.25 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.201-4 Material. | PHMSA | [68 FR 75762, Dec. 31, 2003] | All fittings, tubes, and castings and all projections and their closures, except for protective housing, must also meet the requirements specified in ASTM A 262 (IBR, see § 171.7 of this subchapter), except that when preparing the specimen for testing the carburized surface may be finished by grinding or machining. | |||
| 49:49:3.1.1.1.2.4.1.26 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.201-5 Postweld heat treatment and corrosion resistance. | PHMSA | [68 FR 75762, Dec. 31, 2003] | (a) Tanks and attachments welded directly thereto must be postweld heat treated as a unit at the proper temperature except as indicated below. Tanks and attachments welded directly thereto fabricated from ASTM A 240/A 240M (IBR, see § 171.7 of this subchapter) Type 430A, Type 304 and Type 316 materials must be postweld heat treated as a unit and must be tested to demonstrate that they possess the corrosion resistance specified in § 179.200-7(d), Footnote 2. Tanks and attachments welded directly thereto, fabricated from ASTM A 240/A 240M Type 304L or Type 316L materials are not required to be postweld heat treated. (b) Tanks and attachments welded directly thereto, fabricated from ASTM A 240/A 240M Type 304L and Type 316 materials must be tested to demonstrate that they possess the corrosion resistance specified in § 179.200-7(d), Footnote 2. | |||
| 49:49:3.1.1.1.2.4.1.27 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.201-6 Manways and manway closures. | PHMSA | [85 FR 83403, Dec. 21, 2020] | (a) The manway cover for spec. DOT 104W, 111A60ALW1, 111A60W1, 111A100ALW1, 111A100W1, 111A100W3, or 111A100W6 must be designed to make it impossible to remove the cover while the interior of the tank is subjected to pressure. (b) The manway cover for spec. DOT 111A60W5, or 111A100W5 must be made of a suitable metal. The top, bottom and edge of manway cover must be acid resistant material covered as prescribed in § 179.201-3. Through-bolt holes must be lined with acid resistant material at least one-eighth inch in thickness. A manway cover made of metal not affected by the lading need not be acid resistant material covered. (c) The manway ring and cover for specifications DOT-103CW, 103DW, 103EW, 111A60W7, or 111A100W6 must be made of the metal and have the same inspection procedures specified in AAR Specifications for Tank Cars, appendix M, M3.03 (IBR, see § 171.7 of this subchapter). | |||
| 49:49:3.1.1.1.2.4.1.28 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.201-8 Sampling device and thermometer well. | PHMSA | [Amdt. 179-10, 36 FR 21348, Nov. 6, 1971, as amended at 66 FR 45390, Aug. 28, 2001] | (a) Sampling valve and thermometer well are not specification requirements. When used, they must be of approved design, made of metal not subject to rapid deterioration by lading, and must withstand a pressure of 100 psig without leakage. Interior pipes of the sampling valve must be equipped with excess flow valves of an approved design. Interior pipe of thermometer well must be closed by an approved valve attached close to fitting where it passes through the tank and closed by a screw plug. Other approved arrangements that permit testing thermometer well for leaks without complete removal of the closure may be used. (b) [Reserved] | |||
| 49:49:3.1.1.1.2.4.1.29 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.201-9 Gauging device. | PHMSA | [Amdt. 179-10, 36 FR 21353, Nov. 6, 1971] | A gauging device of an approved design must be applied to permit determining the liquid level of the lading. The gauging device must be made of materials not subject to rapid deterioration by the lading. When the interior pipe of the gauging device provides a means for passage of the lading from the interior to the exterior of the tank, it must be equipped with an excess flow valve of an approved design. If the opening for passage of lading through the gauging device is not more than 0.060 inch diameter an excess flow valve is not required. The gauging device must be provided with a protective housing. | |||
| 49:49:3.1.1.1.2.4.1.3 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.200-3 Type. | PHMSA | [Amdt. 179-10, 36 FR 21348, Nov. 6, 1971] | Tank built under these specifications must be circular in cross section, with formed heads designed convex outward. When specified in § 179.201-1, the tank must have at least one manway or one expansion dome with manway, and such other external projections as are prescribed herein. When the tank is divided into compartments, each compartment must be treated as a separate tank. | |||
| 49:49:3.1.1.1.2.4.1.30 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.201-10 Water capacity marking. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967. Amended at 77 FR 37985, June 25, 2012] | (a) Water capacity of the tank in pounds stamped plainly and permanently in letters and figures at least 3/8 inch high into the metal of the tank immediately below the stamped marks specified in § 179.200-24(a). This mark shall also be stenciled on the jacket immediately below the dome platform and directly behind or within 3 feet of the right or left side of the ladder, or ladders, if there is a ladder on each side of the tank, in letters and figures at least 1 1/2 inches high as follows: (b) After July 25, 2012, authorized DOT non-pressure tank cars that comply with this section and are equipped with stainless steel identification plates may have the water capacity of the tank in pounds prescribed in the first sentence of paragraph (a) of this section stamped plainly and permanently on their identification plate in conformance with the applicable marking requirements prescribed in § 179.24(a) instead of into the metal of the tank or immediately below the stamped marks specified in § 179.200-24(a). | |||
| 49:49:3.1.1.1.2.4.1.31 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.201-11 Insulation. | PHMSA | (a) Insulation shall be of sufficient thickness so that the thermal conductance at 60 °F. is not more than 0.075 Btu per hour, per square foot, per degree F. temperature differential. (b) [Reserved] | ||||
| 49:49:3.1.1.1.2.4.1.32 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.202 Individual specification requirements applicable to DOT-117 tank car tanks. | PHMSA | |||||
| 49:49:3.1.1.1.2.4.1.33 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.202-1 Applicability. | PHMSA | [80 FR 26749, May 8, 2015] | Each tank built under these specifications must conform to the general requirements of § 179.200 and the prescriptive standards in §§ 179.202-1 through 179.202-11, or the performance standard requirements of § 179.202-12. | |||
| 49:49:3.1.1.1.2.4.1.34 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.202-2 [Reserved] | PHMSA | |||||
| 49:49:3.1.1.1.2.4.1.35 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.202-3 Approval to operate at 286,000 gross rail load (GRL). | PHMSA | [80 FR 26749, May 8, 2015] | A tank car may be loaded to a gross weight on rail of up to 286,000 pounds (129,727 kg) upon approval by the Associate Administrator for Safety, Federal Railroad Administration (FRA). See § 179.13. | |||
| 49:49:3.1.1.1.2.4.1.36 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.202-4 Thickness of plates. | PHMSA | [80 FR 26749, May 8, 2015] | The wall thickness after the forming of the tank shell and heads must be, at a minimum, 9/16 of an inch AAR TC-128 Grade B, normalized steel, in accordance with § 179.200-7(b). | |||
| 49:49:3.1.1.1.2.4.1.37 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.202-5 Tank head puncture resistance system. | PHMSA | [80 FR 26749, May 8, 2015] | The DOT-117 specification tank car must have a tank head puncture resistance system in conformance with § 179.16(c). The full height head shields must have a minimum thickness of 1/2 inch. | |||
| 49:49:3.1.1.1.2.4.1.38 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.202-6 Thermal protection system. | PHMSA | [81 FR 53957, Aug. 15, 2016] | The DOT Specification 117 tank car must have a thermal protection system. The thermal protection system must: (a) Conform to § 179.18 of this part; (b) Be equipped with a thermal protection blanket with at least 1/2 -inch-thick material that meets § 179.18(c) of this part; and (c) Include a reclosing pressure relief device in accordance with § 173.31 of this subchapter. | |||
| 49:49:3.1.1.1.2.4.1.39 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.202-7 Jackets. | PHMSA | [80 FR 26749, May 8, 2015] | The entire thermal protection system must be covered with a metal jacket of a thickness not less than 11 gauge A1011 steel or equivalent; and flashed around all openings so as to be weather tight. A protective coating must be applied to the exterior surface of a carbon steel tank and the inside surface of a carbon steel jacket. | |||
| 49:49:3.1.1.1.2.4.1.4 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.200-4 Insulation. | PHMSA | [29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21349, Nov. 6, 1971; Amdt. 179-50, 60 FR 49078, Sept. 21, 1995] | (a) If insulation is applied, the tank shell and expansion dome when used must be insulated with an approved material. The entire insulation must be covered with a metal jacket of a thickness not less than 11 gauge (0.1196 inch) nominal (Manufacturer's Standard Gauge) and flashed around all openings so as to be weather tight. The exterior surface of a carbon steel tank and the inside surface of a carbon steel jacket must be given a protection coating. (b) If insulation is a specification requirement, it shall be of sufficient thickness so that the thermal conductance at 60 °F is not more than 0.225 Btu per hour, per square foot, per degree F temperature differential, unless otherwise provided in § 179.201-1. If exterior heaters are attached to tank, the thickness of the insulation over each heater element may be reduced to one-half that required for the shell. | |||
| 49:49:3.1.1.1.2.4.1.40 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.202-8 Bottom outlets. | PHMSA | [80 FR 26749, May 8, 2015] | If the tank car is equipped with a bottom outlet, the handle must be removed prior to train movement or be designed with protection safety system(s) to prevent unintended actuation during train accident scenarios. | |||
| 49:49:3.1.1.1.2.4.1.41 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.202-9 Top fittings protection. | PHMSA | [80 FR 26749, May 8, 2015] | The tank car tank must be equipped with top fittings protection conforming to AAR Specifications for Tank Cars, appendix E paragraph 10.2.1 (IBR, see § 171.7 of this subchapter). | |||
| 49:49:3.1.1.1.2.4.1.42 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.202-11 Individual specification requirements. | PHMSA | [80 FR 26749, May 8, 2015] | In addition to § 179.200, the individual specification requirements are as follows: | |||
| 49:49:3.1.1.1.2.4.1.43 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.202-12 Performance standard requirements (DOT-117P). | PHMSA | [80 FR 26749, May 8, 2015, as amended at 81 FR 53957, Aug. 15, 2016; 83 FR 48401, Sept. 25, 2018] | (a) Approval. Design, testing, and modeling results must be reviewed and approved by the Associate Administrator for Railroad Safety/Chief Safety Officer, Federal Railroad Administration (FRA), 1200 New Jersey Ave. SE., Washington, DC 20590. (b) Approval to operate at 286,000 gross rail load (GRL). In addition to the requirements of paragraph (a) of this section, a tank car may be loaded to a gross weight on rail of up to 286,000 pounds (129,727 kg) upon approval by the Associate Administrator for Safety, Federal Railroad Administration (FRA). See § 179.13. (c) Puncture resistance. (1) Minimum side impact speed: 12 mph when impacted at the longitudinal and vertical center of the shell by a rigid 12-inch by 12-inch indenter with a weight of 286,000 pounds. (2) Minimum head impact speed: 18 mph when impacted at the center of the head by a rigid 12-inch by 12-inch indenter with a weight of 286,000 pounds. (d) Thermal protection systems. The tank car must be equipped with a thermal protection system. The thermal protection system must be equivalent to the performance standard prescribed in § 179.18 and include a reclosing pressure relief device in accordance with § 173.31 of this subchapter. (e) Bottom outlet. If the tank car is equipped with a bottom outlet, the handle must be removed prior to train movement or be designed with protection safety system(s) to prevent unintended actuation during train accident scenarios. (f) Top fittings protection. The tank car tank must be equipped with top fittings protection conforming to AAR Specifications for Tank Cars, appendix E paragraph 10.2.1 (IBR, see § 171.7 of this subchapter). | |||
| 49:49:3.1.1.1.2.4.1.44 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.202-13 Retrofit standard requirements (DOT-117R). | PHMSA | [80 FR 26749, May 8, 2015, as amended at 81 FR 53957, Aug. 15, 2016; 83 FR 48401, Sept. 25, 2018; 85 FR 83403, Dec. 21, 2020] | (a) Applicability. Each tank retrofit under these specifications must conform to the general requirements of § 179.200 and the prescriptive standards in § 179.202-13, or the performance standard requirements of § 179.202-12. (b) Approval to operate at 286,000 gross rail load (GRL). A tank car may be loaded to a gross weight on rail of up to 286,000 pounds (129,727 kg) upon approval by the Associate Administrator for Safety, Federal Railroad Administration (FRA). See § 179.13. (c) Thickness of plates. The wall thickness after forming of the tank shell and heads must be, at a minimum, 7/16 of an inch, and constructed with steel authorized by the HMR at the time of construction. (d) Tank head puncture resistance system. The DOT-117R specification tank car must have a tank head puncture resistance system in conformance with § 179.16(c). The full height head shields must have a minimum thickness of 1/2 inch. (e) Thermal protection system. (1) The DOT Specification 117R tank car must have a thermal protection system. The thermal protection system must conform to § 179.18 of this part and include a reclosing pressure relief device in accordance with § 173.31 of this subchapter. (2) A non-jacketed tank car modified to the DOT Specification 117R must be equipped with a thermal protection blanket with at least 1/2 -inch-thick material that meets § 179.18(c) of this part. (f) Jackets. The entire thermal protection system must be covered with a metal jacket of a thickness not less than 11 gauge A1011 steel or equivalent; and flashed around all openings so as to be weather tight. The exterior surface of a carbon steel tank and the inside surface of a carbon steel jacket must be given a protective coating. (g) Bottom outlets. If the tank car is equipped with a bottom outlet, the handle must be removed prior to train movement or be designed with protection safety system(s) to prevent unintended actuation during train accident scenarios. (h) Top fittings protection —(1) Protective housing. Except as… | |||
| 49:49:3.1.1.1.2.4.1.45 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | §§ 179.203--179.202-22 [Reserved] | PHMSA | |||||
| 49:49:3.1.1.1.2.4.1.46 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.220 General specifications applicable to nonpressure tank car tanks consisting of an inner container supported within an outer shell (class DOT-115). | PHMSA | |||||
| 49:49:3.1.1.1.2.4.1.47 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.220-1 Tanks built under these specifications must meet the requirements of §§ 179.220 and 179.221. | PHMSA | |||||
| 49:49:3.1.1.1.2.4.1.48 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.220-3 Type. | PHMSA | [Amdt. 179-9, 36 FR 21340, Nov. 6, 1971] | (a) Tanks built under these specifications must consist of an inner container, a support system for the inner container, and an outer shell. (b) The inner container must be a fusion welded tank of circular cross section with formed heads designed convex outward and must have a manway on top of the tank as prescribed herein. When the inner container is divided into compartments, each compartment must be considered a separate container. (c) The outer shell must be a fusion welded tank with formed heads designed convex outward. | |||
| 49:49:3.1.1.1.2.4.1.49 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.220-4 Insulation. | PHMSA | [Amdt. 179-9, 36 FR 21340, Nov. 6, 1971] | The annular space between the inner container and the outer shell must contain an approved insulation material. | |||
| 49:49:3.1.1.1.2.4.1.5 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.200-6 Thickness of plates. | PHMSA | [Amdt. 179-10, 36 FR 21349, Nov. 6, 1971, as amended at 66 FR 45390, Aug. 28, 2001] | (a) The wall thickness after forming of the tank shell, dome shell, and of 2:1 ellipsoidal heads must be not less than specified in § 179.201-1, nor that calculated by the following formula: Where: d = Inside diameter in inches; E = 0.9 Welded joint efficiency; except E = 1.0 for seamless heads; P = Minimum required bursting pressure in psig; S = Minimum tensile strength of plate material in p.s.i. as prescribed in § 179.200-7; t = Minimum thickness of plate in inches after forming. Where: d = Inside diameter in inches; E = 0.9 Welded joint efficiency; except E = 1.0 for seamless heads; P = Minimum required bursting pressure in psig; S = Minimum tensile strength of plate material in p.s.i. as prescribed in § 179.200-7; t = Minimum thickness of plate in inches after forming. (b) The wall thickness after forming of 3:1 ellipsoidal heads must be not less than specified in § 179.201-1, nor that calculated by the following formula: Where: d = Inside diameter in inches; E = 0.9 Welded joint efficiency; except E = 1.0 for seamless heads; P = Minimum required bursting pressure in psig; S = Minimum tensile strength of plate material in p.s.i. as prescribed in § 179.200-7; t = Minimum thickness of plate in inches after forming. Where: d = Inside diameter in inches; E = 0.9 Welded joint efficiency; except E = 1.0 for seamless heads; P = Minimum required bursting pressure in psig; S = Minimum tensile strength of plate material in p.s.i. as prescribed in § 179.200-7; t = Minimum thickness of plate in inches after forming. (c) The wall thickness after forming of a flanged and dished head must be not less than specified in § 179.201-1, nor that calculated by the following formula: Where: E = 0.9 Welded joint efficiency; except E = 1.0 for seamless heads; L = Main inside radius to which head is dished, measured on concave side in inches; P = Minimum required bursting pressure in psig; S = Minimum tensile strength of plate material in p.s… | |||
| 49:49:3.1.1.1.2.4.1.50 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.220-6 Thickness of plates. | PHMSA | [Amdt. 179-9, 36 FR 21340, Nov. 6, 1971, as amended at 66 FR 45390, Aug. 28, 2001; 68 FR 75762, Dec. 31, 2003] | (a) The wall thickness, after forming of the inner container shell and 2:1 ellipsoidal heads must be not less than specified in § 179.221-1, or not less than that calculated by the following formula: Where: d = Inside diameter in inches; E = 0.9 welded joint efficiency; except E = 1.0 for seamless heads; P = Minimum required bursting pressure in psig; S = Minimum tensile strength of plate material in p.s.i. as prescribed in AAR Specifications for Tank Cars, appendix M, Table M1; t = Minimum thickness of plate in inches after forming. Where: d = Inside diameter in inches; E = 0.9 welded joint efficiency; except E = 1.0 for seamless heads; P = Minimum required bursting pressure in psig; S = Minimum tensile strength of plate material in p.s.i. as prescribed in AAR Specifications for Tank Cars, appendix M, Table M1; t = Minimum thickness of plate in inches after forming. (b) The wall thickness after forming of the inner container heads, if flanged and dished, must be not less than specified in § 179.221-1, or not less than that calculated by the following formula: Where: E = 0.9 welded joint efficiency; except E = 1.0 for seamless heads; L = Main inside radius to which head is dished, measured on concave side in inches; P = Minimum required bursting pressure in psig; S = Minimum tensile strength of plate material in psi as prescribed in AAR Specifications for Tank Cars, appendix M, Table M1 (IBR, see § 171.7 of this subchapter); t = Minimum thickness of plate in inches after forming. Where: E = 0.9 welded joint efficiency; except E = 1.0 for seamless heads; L = Main inside radius to which head is dished, measured on concave side in inches; P = Minimum required bursting pressure in psig; S = Minimum tensile strength of plate material in psi as prescribed in AAR Specifications for Tank Cars, appendix M, Table M1 (IBR, see § 171.7 of this subchapter); t = Minimum thickness of plate in inches after forming. (c) The wall thickness after forming of t… | |||
| 49:49:3.1.1.1.2.4.1.51 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.220-7 Materials. | PHMSA | [Amdt. 179-9, 36 FR 21340, Nov. 6, 1971, as amended by Amdt. 179-28, 46 FR 49906, Oct. 8, 1981; Amdt. 179-40, 52 FR 13048, Apr. 20, 1987; Amdt. 179-52, 61 FR 28681, June 5, 1996; 66 FR 45186, Aug. 28, 2001; 67 FR 51660, Aug. 8, 2002; 68 FR 75762, Dec. 31, 2003] | (a) The plate material used to fabricate the inner container and nozzles must meet one of the following specifications and with the indicated minimum tensile strength and elongation in the welded condition. (b) Carbon steel plate: The maximum allowable carbon content must be 0.31 percent when the individual specification allows carbon content greater than this amount. The plates may be clad with other approved materials. 1 Maximum stresses to be used in calculations. 2 This specification is incorporated by reference (IBR, see § 171.7 of this subchapter). (c) Aluminum alloy plate: Aluminum alloy plate must be suitable for welding and comply with one of the following specifications (IBR, see § 171.7 of this subchapter): * * * 1 For fabrication, the parent plate material may be 0 H112, or H32 temper, but design calculations must be based on the minimum tensile strength shown. 2 0 temper only. 3 Weld filler metal 5556 must not be used. 4 Maximum stresses to be used in calculations. (d) High alloy steel plate: High alloy steel plate must comply with one of the following specifications (IBR, see § 171.7 of this subchapter): 1 Maximum stresses to be used in calculations. (e) Manganese-molybdenum steel plate: Manganese-molybdenum steel plate must be suitable for fusion welding and must comply with the following specification (IBR, see § 171.7 of this subchapter): 1 Maximum stresses to be used in calculations. (f) Plate materials used to fabricate the outer shell and heads must be those listed in paragraphs (b), (c), (d), or (e) of this section. The maximum allowable carbon content must be 0.31 percent when the individual specification allows carbon content greater than this amount. The plates may be clad with other approved materials. (g) All appurtenances on the inner container in contact with the lading must be made of approved material compatible with the plate material of the inner container. These appurtenances must not be subject to rapid deterioration by the lading, or must be coated or lin… | |||
| 49:49:3.1.1.1.2.4.1.52 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.220-8 Tank heads. | PHMSA | [Amdt. 179-9, 36 FR 21341, Nov. 6, 1971] | (a) Tank heads of the inner container, inner container compartments and outer shell must be of approved contour, and may be flanged and dished or ellipsoidal for pressure on concave side. (b) Flanged and dished heads must have main inside radius not exceeding 10 feet and inside knuckle radius must be not less than 3 3/4 inches for steel and alloy steel tanks nor less than 5 inches for aluminum alloy tanks. (c) Ellipsoidal heads must be an ellipsoid of revolution in which the major axis must equal the diameter of the shell and the minor axis must be one-half the major axis. | |||
| 49:49:3.1.1.1.2.4.1.53 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.220-9 Compartment tanks. | PHMSA | [Amdt. 179-9, 36 FR 21341, Nov. 6, 1971] | (a) The inner container may be divided into compartments by inserting interior heads, or by fabricating each compartment as a separate container and joining with a cylinder, or by fabricating each compartment as a separate tank without a joining cylinder. Each compartment must be capable of withstanding, without evidence of yielding or leakage, the required test pressure applied in each compartment separately, or in any combination of compartments. (b) When the inner container is divided into compartments by fabricating each compartment as a separate container and joining with a cylinder, the cylinder must have a plate thickness not less than that required for the inner container shell and must be applied to the outside surface of the straight flange portion of the container head. The cylinder must fit the straight flange tightly for a distance of at least two times the plate thickness, or 1 inch, whichever is greater and must be joined to the straight flange by a full fillet weld. Distance from fillet weld seam to container head seam must be not less than 1 1/2 inches or three times the plate thickness, whichever is greater. | |||
| 49:49:3.1.1.1.2.4.1.54 | 49 | Transportation | I | C | 179 | PART 179—SPECIFICATIONS FOR TANK CARS | D | Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) | § 179.220-10 Welding. | PHMSA | [Amdt. 179-9, 36 FR 21341, Nov. 6, 1971, as amended at 68 FR 75762, Dec. 31, 2003] | (a) All joints must be fusion welded in compliance with AAR Specifications for Tank Cars, appendix W (IBR, see § 171.7 of this subchapter). Welding procedures, welders, and fabricators shall be approved. (b) Radioscopy of the outer shell is not a specification requirement. (c) Welding is not permitted on or to ductile iron or malleable iron fittings. |
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