# -2 Material.

- **operation:** document
- **citation:** 49 CFR 178.255-2
- **title:** -2 Material.
- **source type:** regulation
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** current
- **official:** true
- **published on:** Not available
- **effective on:** 2026-08-18
- **summary:** (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 follo
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- **app url:** https://regulus.evalyn.ai/document/49-cfr-178-255-2
- **source url:** https://www.ecfr.gov/on/2026-08-18/title-49/section-178.255-2
**body:**

(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]
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- **body characters:** 587