---
kind: "section"
citation: "49 C.F.R. § 179.103-1"
title: "49"
number: "179.103-1"
heading: "Type."
url: "https://uscodex.org/cfr/49/179.103-1"
---

# §179.103-1. Type.

- (a) Tanks built under this section may be of any approved cross section.
- (b) Any portion of the tank shell not circular in cross section shall have walls of such thickness and be so reinforced that the stresses in the walls caused by a given internal pressure are no greater than the circumferential stresses which would exist under the same internal pressure in the wall of a tank of circular cross section designed in accordance with paragraphs § [179.100-6 (a)](/cfr/49/179.100-6.md?p=a) and [(b)](/cfr/49/179.100-6.md?p=b), but in no case shall the wall thickness be less than that specified in [§ 179.101](/cfr/49/179.101.md).
- (c) [Reserved]
- (d) **Valves and fittings need not be mounted on the manway cover.**
- (e) One opening may be provided in each head for use in purging the tank interior.

## Notes

### Amendments

[29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-50, 60 FR 49077, Sept. 21, 1995]

### 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. 179-50, 60 FR 49077, Sept. 21, 1995]