---
kind: "section"
citation: "49 C.F.R. § 180.411"
title: "49"
number: "180.411"
heading: "Acceptable results of tests and inspections."
url: "https://uscodex.org/cfr/49/180.411"
---

# §180.411. Acceptable results of tests and inspections.

- (a) **Corroded or abraded areas.** The minimum thickness may not be less than that prescribed in the applicable specification.
- (b) **Dents, cuts, digs and gouges.** For evaluation procedures, see CGA C-6 (IBR, see [§ 171.7](/cfr/49/171.7.md) of this subchapter).
  - (1) **For dents at welds or that include a weld, the maximum allowable depth is 1/2 inch.** For dents away from welds, the maximum allowable depth is 1/10 of the greatest dimension of the dent, but in no case may the depth exceed one inch.
  - (2) The minimum thickness remaining beneath a cut, dig, or gouge may not be less than that prescribed in the applicable specification.
- (c) **Weld or structural defects.** Any cargo tank with a weld defect such as a crack, pinhole, or incomplete fusion, or a structural defect must be taken out of hazardous materials service until repaired.
- (d) **Leakage.** All sources of leakage must be properly repaired prior to returning a tank to hazardous materials service.
- (e) **Relief valves.** Any pressure relief valve that fails to open and reclose at the prescribed pressure must be repaired or replaced.
- (f) **Liner integrity.** Any defect shown by the test must be properly repaired.
- (g) **Pressure test.** Any tank that fails to meet the acceptance criteria found in the individual specification that applies must be properly repaired.

## Notes

### Amendments

[Amdt. 180-2, 54 FR 25032, June 12, 1989, as amended at 68 FR 75764, Dec. 31, 2003]

### Authority

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

### Source

Source: Amdt. 180-2, 54 FR 25032, June 12, 1989, unless otherwise noted.

### Amendments

[Amdt. 180-2, 54 FR 25032, June 12, 1989, as amended at 68 FR 75764, Dec. 31, 2003]