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C.F.R - Table of Contents

  • Title 1 - General Provisions
  • Title 2 - Grants and Agreements
  • Title 3 - The President
  • Title 4 - Accounts
  • Title 5 - Administrative Personnel
  • Title 6 - Domestic Security
  • Title 7 - Agriculture
  • Title 8 - Aliens and Nationality
  • Title 9 - Animals and Animal Products
  • Title 10 - Energy
  • Title 11 - Federal Elections
  • Title 12 - Banks and Banking
  • Title 13 - Business Credit and Assistance
  • Title 14 - Aeronautics and Space
  • Title 15 - Commerce and Foreign Trade
  • Title 16 - Commercial Practices
  • Title 17 - Commodity and Securities Exchanges
  • Title 18 - Conservation of Power and Water Resources
  • Title 19 - Customs Duties
  • Title 20 - Employees' Benefits
  • Title 21 - Food and Drugs
  • Title 22 - Foreign Relations
  • Title 23 - Highways
  • Title 24 - Housing and Urban Development
  • Title 25 - Indians
  • Title 26 - Internal Revenue
  • Title 27 - Alcohol, Tobacco Products and Firearms
  • Title 28 - Judicial Administration
  • Title 29 - Labor
  • Title 30 - Mineral Resources
  • Title 31 - Money and Finance: Treasury
  • Title 32 - National Defense
  • Title 33 - Navigation and Navigable Waters
  • Title 34 - Education
  • Title 35 - Panama Canal
  • Title 36 - Parks, Forests, and Public Property
  • Title 37 - Patents, Trademarks, and Copyrights
  • Title 38 - Pensions, Bonuses, and Veterans' Relief
  • Title 39 - Postal Service
  • Title 40 - Protection of Environment
  • Title 41 - Public Contracts and Property Management
  • Title 42 - Public Health
  • Title 43 - Public Lands: Interior
  • Title 44 - Emergency Management and Assistance
  • Title 45 - Public Welfare
  • Title 46 - Shipping
  • Title 47 - Telecommunication
  • Title 48 - Federal Acquisition Regulations System
  • Title 49 - Transportation
  • Title 50 - Wildlife and Fisheries

CFR > Title 49 - Transportation > SUBTITLE B—Other Regulations Relating to Transportation > CHAPTER I—PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (Parts 105–199) > SUBCHAPTER C—HAZARDOUS MATERIALS REGULATIONS (Parts 171–181) > PART 179—SPECIFICATIONS FOR TANK CARS > SUBPART F—Specification for Cryogenic Liquid Tank Car Tanks and Seamless Steel Tanks (Classes DOT-113 and 107A) (§179.400 to §179.500-18) > 179.400-12—Postweld heat treatment.

179.400-12—Postweld heat treatment.

(a) Postweld heat treatment of the inner tank is not required.
(b) The cylindrical portion of the outer jacket, with the exception of the circumferential closing seams, must be postweld heat treated as prescribed in AAR Specifications for Tank Cars, appendix W (IBR, see § 171.7 of this subchapter). Any item to be welded to this portion of the outer jacket must be attached before postweld heat treatment. Welds securing the following need not be postweld heat treated when it is not practical due to final assembly procedures:
(1) the inner tank support system to the outer jacket,
(2) connections at piping penetrations,
(3) closures for access openings, and
(4) circumferential closing joints of head to shell joints.
(c) When cold formed heads are used on the outer jacket they must be heat treated before welding to the jacket shell if postweld heat treatment is not practical due to assembly procedures.
[Amdt. 179-32, 48 FR 27708, June 16, 1983, as amended at 68 FR 75763, Dec. 31, 2003]




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