StacksVerified U.S. regulatory reference

49 CFR §179.220-3

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Tanks built under these specifications must consist of an inner container, a support system for the inner container, and an outer shell.
  2. (b)The inner container must be a fusion welded tank of circular cross section with formed heads designed convex outward and must have a manway on top of the tank as prescribed herein. When the inner container is divided into compartments, each compartment must be considered a separate container.
  3. (c)The outer shell must be a fusion welded tank with formed heads designed convex outward.