# -3 Type.

- **operation:** document
- **citation:** 49 CFR 179.220-3
- **title:** -3 Type.
- **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) 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 
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- **markdown:** https://regulus.evalyn.ai/document/49-cfr-179-220-3.md
- **app url:** https://regulus.evalyn.ai/document/49-cfr-179-220-3
- **source url:** https://www.ecfr.gov/on/2026-08-18/title-49/section-179.220-3
**body:**

(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]
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- **body characters:** 574