U.S. Code of Federal Regulations
Regulations most recently checked for updates: Feb 24, 2020
(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||
|Over 1,200 to 1,800 gallons||
|Over 1,800 gallons||