Repair, modification, stretching, or rebarrelling of cargo tanks.

(a) General. For purposes of this section, “stretching” is not considered a “modification” and “rebarrelling” is not considered a “repair.” Any repair, modification, stretching, or rebarrelling of a cargo tank must be performed in conformance with the requirements of this section.

(b) Repair—(1) Non-ASME Code stamped cargo tanks. Any work involving repair on an MC 300, MC 301, MC 302, MC 303, MC 304, MC 305, MC 306, MC 307, MC 310, MC 311, or MC 312 cargo tank that is not ASME Code stamped must be performed by:

(i) A cargo tank manufacturer holding a valid ASME Certificate of Authorization for the use of the ASME “U” stamp and registered with DOT; or

(ii) A repair facility holding a valid National Board Certificate of Authorization for the use of the National Board “R” stamp and registered with DOT.

(2) ASME Code stamped cargo tanks. Any work involving repair on any ASME Code stamped cargo tank must be performed by a repair facility holding a valid National Board Certificate of Authorization for the use of the National Board “R” stamp and registered in accordance with subpart F of part 107 of subchapter B of this chapter.

(3) The following provisions apply to cargo tank repairs:

(i) DOT 406, DOT 407, and DOT 412 cargo tanks must be repaired in accordance with the specification requirements in effect either at the time of manufacture or at the time of repair;

(ii) MC 300, MC 301, MC 302, MC 303, MC 305, and MC 306 cargo tanks must be repaired in accordance with either the original specification or with the DOT 406 specification in effect at the time of repair;

(iii) MC 304 and MC 307 cargo tanks must be repaired in accordance with either the original specification or with the DOT 407 specification in effect at the time of repair;

(iv) MC 310, MC 311, and MC 312 cargo tanks must be repaired in accordance with either the original specification or with the DOT 412 specification in effect at the time of the repair;

(v) MC 338 cargo tanks must be repaired in accordance with the specification requirements in effect either at the time of manufacture or at the time of repair; and

(vi) MC 330 and MC 331 cargo tanks must be repaired in accordance with the repair procedures described in CGA Technical Bulletin TB-2 and the National Board Inspection Code—Provisions for Repair of Pressure Vessels. Each cargo tank having cracks or other defects requiring welded repairs must meet all of the requirements of § 178.337-16 of this subchapter (in effect at the time of the repair), except that postweld heat treatment after minor weld repairs is not required. When any repair is made of defects revealed by the wet fluorescent magnetic particle inspection, including those by grinding, the affected area of the cargo tank must again be examined by the wet fluorescent magnetic particle method after hydrostatic testing to assure that all defects have been removed.

(4) Prior to any repair work, the cargo tank must be emptied of any hazardous material lading. Cargo tanks containing flammable or toxic lading must be purged.

(5) Any repair of a cargo tank involving welding on the shell or head must be certified by a Registered Inspector. Any repair of an ASME Code “U” stamped cargo tank must be in accordance with the National Board Inspection Code.

(6) The suitability of any repair affecting the structural integrity of the cargo tank must be determined by the testing required either in the applicable manufacturing specification, or in § 180.407(g)(1)(iv).

(c) Maintenance or replacement of piping, valves, hoses or fittings. In the event of repair, maintenance or replacement, any piping, valve, or fitting must be properly installed in accordance with the provisions of the applicable specification before the cargo tank is returned to hazardous materials service. After maintenance or replacement which does not involve welding on the cargo tank wall, the repaired piping, valves or fittings, the replaced segment of the piping must be leak tested. After repair or replacement of piping, valves or fittings which involves welding on the cargo tank wall, the entire cargo tank, including the repaired or replaced piping, valve or fitting, must be pressure tested in accordance with the applicable specification. Hoses permanently attached to the cargo tank must be tested either before or after installation.

(d) Modification, stretching, or rebarrelling. Modification, stretching or rebarrelling of a cargo tank must conform to the following provisions:

(1) Non-ASME Code stamped cargo tanks. If the modification, stretching, or rebarrelling will result in a design type change, then it must be approved by a Design Certifying Engineer. Any work involving modification, stretching, or rebarrelling on an MC 300, MC 301, MC 302, MC 303, MC 304, MC 305, MC 306, MC 307, MC 310, MC 311, or MC 312 cargo tank that is not ASME stamped must be performed by:

(i) A cargo tank manufacturer holding a valid ASME Certificate of Authorization for the use of the ASME “U” stamp and registered with DOT; or

(ii) A repair facility holding a valid National Board Certificate of Authorization for the use of the National Board “R” stamp and registered with DOT.

(2) ASME Code stamped cargo tanks. The modification, stretching, or rebarrelling on any ASME Code stamped cargo tank must be performed by a repair facility holding a valid National Board Certificate of Authorization for the use of the National Board “R” stamp and registered in accordance with subpart F of part 107 of subchapter B of this chapter. If the modification, stretching, or rebarrelling will result in a design type change, then it must be approved by a Design Certifying Engineer.

(3) Except as provided in paragraph (d)(3)(v) in this section, all new material and equipment, and equipment affected by modification, stretching or rebarrelling must meet the requirements of the specification in effect at the time such work is performed, and must meet the applicable structural integrity requirements (§§ 178.337-3, 178.338-3, or 178.345-3 of this subchapter). The work must conform to the requirements of the applicable specification as follows:

(i) For specification MC 300, MC 301, MC 302, MC 303, MC 305 and MC 306 cargo tanks, the provisions of either specification MC 306 or DOT 406 until August 31, 1995 and, thereafter to specification DOT 406 only;

(ii) For specification MC 304 and MC 307 cargo tanks, the provisions of either specification MC 307 or DOT 407 until August 31, 1995 and, thereafter to specification DOT 407 only;

(iii) For specification MC 310, MC 311, and MC 312 cargo tanks, the provisions of either specification MC 312 or DOT 412 until August 31, 1995 and, thereafter to specification DOT 412 only;

(iv) For specification MC 330 cargo tanks, the provisions of specification MC 331; and

(v) For Specification MC 338 cargo tanks, the provisions of specification MC 338. However, structural modifications to MC 338 cargo tanks authorized under § 180.405(d) may conform to applicable provisions of the ASME Code instead of specification MC 338, provided the structural integrity of the modified cargo tank is at least equivalent to that of the original cargo tank.

(4) The person performing the modification, stretching, or rebarrelling must:

(i) Have knowledge of the original design concept, particularly with respect to structural design analysis, material and welding procedures;

(ii) Assure compliance with the rebuilt cargo tank's structural integrity, venting, and accident damage protection requirements;

(iii) Assure compliance with all applicable Federal Motor Carrier Safety Regulations for any newly installed safety equipment;

(iv) Perform all retest procedures on each cargo tank in accordance with the applicable specification and § 180.407;

(v) Change the existing specification plate to reflect the cargo tank as modified, stretched or rebarrelled. This must include the name of the person doing the work, his DOT registration number, date, retest information, etc. A supplemental specification plate may be installed immediately adjacent to the existing plate(s), or the existing specification plate may be removed and replaced with a new plate; and

(vi) On a variable specification cargo tank, install a supplemental or new variable specification plate, and replace the specification listed on the original specification plate with the words “see variable specification plate”.

(5) The design of the modified, stretched, or rebarrelled cargo tank must be approved by a Design Certifying Engineer registered in accordance with subpart F of part 107 of subchapter B of this chapter. The Design Certifying Engineer must certify that the modified, stretched, or rebarrelled cargo tank meets the structural integrity requirements of the applicable specification. The person performing the modifying, stretching or rebarrelling and a Registered Inspector must certify that the cargo tank is in compliance with this section and the applicable specification by issuing a supplemental manufacturer's certificate. The registration number of the Registered Inspector and the person performing the modification, stretching, or rebarrelling must be entered on the certificate. When a cargo tank is rebarrelled, it must be designed, constructed and certified in accordance with a cargo tank specification currently authorized for construction in part 178 of this subchapter.

(6) If the mounting of the cargo tank on the cargo tank motor vehicle involves welding on the cargo tank head or shell, then the mounting must be performed as follows:

(i) Non-ASME Code stamped cargo tanks. For a non-ASME Code stamped cargo tank—

(A) By a cargo tank manufacturer holding an ASME “U” stamp, registered with DOT, and under the direction of a Design Certifying Engineer; or

(B) By a repair facility holding an ASME “U” stamp or a National Board “R” stamp, registered with DOT, and under the direction of a Design Certifying Engineer.

(ii) ASME Code stamped cargo tank. For an ASME Code stamped cargo tank, by a repair facility holding a National Board “R” stamp, registered in accordance with subpart F of part 107 of subchapter B of this chapter, and approved by a Design Certifying Engineer.

(7) If the mounting of a cargo tank on a cargo tank motor vehicle does not involve welding on the cargo tank head or shell, or a change or modification of the methods of attachment, then the mounting shall be in accordance with the original specification or with the specification in effect at the time of the mounting. If the mounting involves any change or modification of the methods of attachment, then the mounting must be approved by a Design Certifying Engineer.

(8) Prior to any modification, stretching, or rebarrelling a cargo tank must be emptied of any hazardous material lading. Cargo tanks containing flammable or toxic lading must be purged.

(9) Any modification, stretching, or rebarrelling on the cargo tank involving welding on the shell or head must be certified by a Registered Inspector. Any repair of an ASME Code “U” stamped cargo tank must be in accordance with the National Board Inspection Code.

(10) The suitability of any modification affecting the structural integrity of the cargo tank, with respect to pressure, must be determined by the testing required either in the applicable manufacturing specification, or in § 180.407(g)(1)(iv).

(e) Records. Each owner of a cargo tank must retain at its principal place of business all records of repair, modification, stretching, or rebarrelling made to each cargo tank during the time the cargo tank is in service and for one year thereafter. Copies of these records must be retained by a motor carrier, who is not the owner of the cargo tank, at its principal place of business during the period the cargo tank is in the carrier's service. The seller of a specification cargo tank shall provide the purchaser a copy of the cargo tank Certificate of Compliance, and all repair, inspection and test reports upon sale as an MC or DOT cargo tank.

[Amdt. 180-7, 59 FR 55178, Nov. 3, 1994; 60 FR 17402, Apr. 5, 1995, as amended by Amdt. 180-10, 61 FR 51342, Oct. 1, 1996]