U.S. Code of Federal Regulations

Regulations most recently checked for updates: Feb 24, 2020

§ 178.255-2 - Material.

(a) Material used in the tank must be steel of good weldable quality and conform with the requirements in Sections V, VIII, and IX of the ASME Code (IBR, see § 171.7 of this subchapter).

(b) The minimum thickness of metal, exclusive of lining material, for shell and heads of tanks shall be as follows:

Tank capacity Minimum thickness (inch)
Not more than 1,200 gallons 1/4
Over 1,200 to 1,800 gallons 5/16
Over 1,800 gallons 3/8
[29 FR 18972, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 178-7, 34 FR 18250, Nov. 14, 1969; 68 FR 75750, Dec. 31, 2003]