---
kind: "section"
citation: "46 C.F.R. § 108.171"
title: "46"
number: "108.171"
heading: "Class I, Division 1 locations."
url: "https://uscodex.org/cfr/46/108.171"
---

# §108.171. Class I, Division 1 locations.


The following are Class I, Division 1 locations:

- (a) An enclosed space that contains any part of the mud circulating system that has an opening into the space and is between the well and final degassing discharge.
- (b) An enclosed or semi-enclosed location that is below the drill floor, and contains a possible source of gas release.
- (c) An enclosed space that is on the drill floor, and is not separated by a solid, gas-light floor from the spaces specified in [paragraph (b)](#b) of this section.
- (d) A space that would normally be considered a Division 2 location under [§ 108.173](/cfr/46/108.173.md) but where combustible or flammable gases might accumulate.
- (e) A location in the weather, or a semi-enclosed location, except as provided in [paragraph (b)](#b) of this section that is within 1.5 m (5 ft.) of the boundary of any—
  - (1) Equipment or opening specified in [paragraph (a)](#a) of this section;
  - (2) Ventilation outlet, access, or other opening to a Class I, Division 1 space; or
  - (3) **Gas vent outlet.**
- (f) Except as provided in [§ 108.175](/cfr/46/108.175.md), an enclosed space that has an opening into a Class I, Division 1 location.

## Notes

### Authority

Authority: 43 U.S.C. 1333; 46 U.S.C. 3102, 3306; DHS Delegation No. 00170.1, Revision No. 01.4.

### Source

Source: CGD 73-251, 43 FR 56808, Dec. 4, 1978, unless otherwise noted.