U.S. Code of Federal Regulations
Regulations most recently checked for updates: Jan 25, 2021
(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.
(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.
(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).
(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.
(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.
(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.
(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.
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).
(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 and test equipment.
(12) A system for the maintenance of records, inspections, tests, and the interpretation of inspection and test results.
(c) Each tank car facility shall ensure that only personnel qualified for each non-destructive inspection and test perform that particular operation.
(d) Each tank car facility shall provide written procedures to its employees to ensure that the work on the tank car conforms to the specification, AAR approval, and owner's acceptance criteria.
(e) Each tank car facility shall train its employees in accordance with subpart H of part 172 of this subchapter on the program and procedures specified in paragraph (b) of this section to ensure quality.
(f) No tank car facility may manufacture, repair, inspect, test, qualify or maintain tank cars subject to requirements of this subchapter, unless it is operating in conformance with a quality assurance program and written procedures required by paragraphs (a) and (b) of this section.
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.