49 CFR § 178.255-2 - Material.
---
identifier: "/us/cfr/t49/s178.255-2"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 178.255-2 - Material."
title_number: 49
title_name: "Transportation"
section_number: "178.255-2"
section_name: "Material."
chapter_name: "PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "C"
subchapter_name: "HAZARDOUS MATERIALS REGULATIONS"
part_number: "178"
part_name: "SPECIFICATIONS FOR PACKAGINGS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 5101-5128; 49 CFR 1.81 and 1.97."
cfr_part: "178"
---
# 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 | ⁄ |
| Over 1,200 to 1,800 gallons | ⁄ |
| Over 1,800 gallons | ⁄ |
[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]