# -10 Sump or siphon bowl.

**Citation:** 49 CFR 179.400-10  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

A sump or siphon bowl may be in the bottom of the inner tank shell if—

(a) It is formed directly into the inner tank shell, or is formed and welded to the inner tank shell and is of weldable quality metal that is compatible with the inner tank shell;

(b) The stress in any orientation under any con

## Document text

A sump or siphon bowl may be in the bottom of the inner tank shell if—

(a) It is formed directly into the inner tank shell, or is formed and welded to the inner tank shell and is of weldable quality metal that is compatible with the inner tank shell;

(b) The stress in any orientation under any condition does not exceed the circumferential stress in the inner tank shell; and

(c) The wall thickness is not less than that specified in § 179.401-1.

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-179.400-10>
- Source ID: `ecfr`
- SHA-256: `37972b99f5b3a6a390b45933ce22dc496ecff3931e7231a8387915418a08ad9e`
- Retrieved: 2026-08-20T05:46:20.606Z
- Exported: 2026-08-23T00:31:45.831Z
- Document slug: `49-cfr-179-400-10`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "179",
  "section": "179.400-10",
  "subpart": "Subpart F—Specification for Cryogenic Liquid Tank Car Tanks and Seamless Steel Tanks (Classes DOT-113 and 107A)",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```