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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
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  • 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
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  • 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
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  • Title 25 - Indians
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  • 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
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  • 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 E—Specifications for Multi-Unit Tank Car Tanks (Classes DOT-106A and 110AW) (§179.300 to §179.302) > 179.300-8—Tank heads.

179.300-8—Tank heads.

(a) Class DOT-110A tanks shall have fusion-welded heads formed concave to pressure. Heads for fusion welding shall be an ellipsoid of revolution 2:1 ratio of major to minor axis. They shall be one piece, hot formed in one heat so as to provide a straight flange at least 1 1/2 inches long. The thickness shall not be less than that calculated by the following formula:
where symbols are as defined in § 179.300-6(a).
(b) Class DOT-106A tanks must have forged-welded heads, formed convex to pressure. Heads for forge welding must be torispherical with an inside radius not greater than the inside diameter of the shell. They must be one piece, hot formed in one heat so as to provide a straight flange at least 4 inches long. They must have snug drive fit into the shell for forge welding. The wall thickness after forming must be sufficient to meet the test requirements of § 179.300-16 and to provide for adequate threading of openings.
[29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21355, Nov. 6, 1971]




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