---
kind: "section"
citation: "49 C.F.R. § 179.100-3"
title: "49"
number: "179.100-3"
heading: "Type."
url: "https://uscodex.org/cfr/49/179.100-3"
---

# §179.100-3. Type.

- (a) Tanks built under this specification shall be fusion-welded with heads designed convex outward. Except as provided in [§ 179.103](/cfr/49/179.103.md) they shall be circular in cross section, shall be provided with a manway nozzle on top of the tank of sufficient size to permit access to the interior, a manway cover to provide for the mounting of all valves, measuring and sampling devices, and a protective housing. Other openings in the tank are prohibited, except as provided in [part 173](/cfr/49/part173.md) of this chapter, §§ [179.100-14](/cfr/49/179.100-14.md), [179.101-1](/cfr/49/179.101-1.md), [179.102](/cfr/49/179.102.md) or [§ 179.103](/cfr/49/179.103.md).
- (b) Head shields and shells of tanks built under this specification must be normalized. Tank car heads must be normalized after forming unless specific approval is granted for a facility's equipment and controls.

## Notes

### Amendments

[29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21344, Nov. 6, 1971; 65 FR 58632, Sept. 29, 2000; 74 FR 1802, Jan. 13, 2009]

### Authority

Authority: 49 U.S.C. 5101-5128; 49 CFR 1.81 and 1.97.

### Source

Source: 29 FR 18995, Dec. 29, 1964, unless otherwise noted. Redesignated at 32 FR 5606, Apr. 5, 1967.

### Amendments

[29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21344, Nov. 6, 1971; 65 FR 58632, Sept. 29, 2000; 74 FR 1802, Jan. 13, 2009]