49 C.F.R. § 179.220-3 Type.
Title 49 - Transportation
(a) Tanks built under these specifications must consist of an inner container, a support system for the inner container, and an outer shell. (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. (c) The outer shell must be a fusion welded tank with formed heads designed convex outward. [Amdt. 179–9, 36 FR 21340, Nov. 6, 1971]
Title 49: Transportation
PART 179—SPECIFICATIONS FOR TANK CARS
Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW and 115AW)
§ 179.220-3 Type.
