---
kind: "section"
citation: "49 C.F.R. § 179.500-3"
title: "49"
number: "179.500-3"
heading: "Type and general requirements."
url: "https://uscodex.org/cfr/49/179.500-3"
---

# §179.500-3. Type and general requirements.

- (a) Tanks built under this specification shall be hollow forged or drawn in one piece. Forged tanks shall be machined inside and outside before ends are necked-down and, after necking-down, the ends shall be machined to size on the ends and outside diameter. Machining not necessary on inside or outside of seamless steel tubing, but required on ends after necking-down.
- (b) For tanks made in foreign countries, chemical analysis of material and all tests as specified must be carried out within the limits of the United States under supervision of a competent and disinterested inspector; in addition to which, provisions in § [179.500-18 (b)](/cfr/49/179.500-18.md?p=b) and [(c)](/cfr/49/179.500-18.md?p=c) shall be carried out at the point of manufacture by a recognized inspection bureau with principal office in the United States.
- (c) The term “marked end” and “marked test pressure” used throughout this specification are defined as follows:
  - (1) “Marked end” is that end of the tank on which marks prescribed in [§ 179.500-17](/cfr/49/179.500-17.md) are stamped.
  - (2) “Marked test pressure” is that pressure in psig which is indicated by the figures substituted for the **** in the marking DOT-107A **** stamped on the marked end of tank.
- (d) The gas pressure at 130 °F in the tank shall not exceed 7/10 of the marked test pressure of the tank.

## Notes

### Amendments

[Amdt. 179-32, 48 FR 27708, June 16, 1983, as amended at 66 FR 45186, 45391, Aug. 28, 2001]

### Source

Source: Amdt. 179-32, 48 FR 27708, June 16, 1983, unless otherwise noted.

### 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

[Amdt. 179-32, 48 FR 27708, June 16, 1983, as amended at 66 FR 45186, 45391, Aug. 28, 2001]