# Segregation in single hold vessels.

**Citation:** 49 CFR 176.145  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(a) On board a vessel having a single cargo hold, Class 1 (explosive) materials in hazard division/compatibility group 1.1B and 1.2B may be stowed in the same compartment with substances of compatibility group D, provided:

(1) The net explosive weight of the compatibility group B explosive does not

## Document text

(a) On board a vessel having a single cargo hold, Class 1 (explosive) materials in hazard division/compatibility group 1.1B and 1.2B may be stowed in the same compartment with substances of compatibility group D, provided:

(1) The net explosive weight of the compatibility group B explosive does not exceed 50 kg (110 pounds); and

(2) The compatibility group B explosive materials are stowed in a steel portable magazine that is stowed at least 6 m (20 feet) from the compatibility group D substances.

(b) Division/compatibility group 1.4B (explosive) materials may be stowed in the same compartment with substances of compatibility group D provided the Class 1 (explosive) materials of different compatibility groups are separated by either a distance of at least 6 m (20 feet) or by a steel partition.

[Amdt. 176-30, 55 FR 52696, Dec. 21, 1990, as amended at 66 FR 45384, Aug. 28, 2001]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-176.145>
- Source ID: `ecfr`
- SHA-256: `32f9d6030f4509ed6c13a280abd84be9d462588538413b825c06ed06e5aee4a2`
- Retrieved: 2026-08-20T05:46:14.489Z
- Exported: 2026-08-23T09:02:15.564Z
- Document slug: `49-cfr-176-145`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "176",
  "section": "176.145",
  "subpart": "Subpart G—Detailed Requirements for Class 1 (Explosive) Materials",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```