StacksVerified U.S. regulatory reference

49 CFR §179.220-6

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)The wall thickness, after forming of the inner container shell and 2:1 ellipsoidal heads must be not less than specified in § 179.221-1, or not less than that calculated by the following formula:
  2. (b)The wall thickness after forming of the inner container heads, if flanged and dished, must be not less than specified in § 179.221-1, or not less than that calculated by the following formula:
  3. (c)The wall thickness after forming of the cylindrical section and heads of the outer shell must be not less than seven-sixteenths of an inch.
  4. (d)See § 179.220-9 for plate thickness requirements for inner container when divided into compartments.