---
kind: "section"
citation: "46 C.F.R. § 182.480"
title: "46"
number: "182.480"
heading: "Flammable vapor detection systems."
url: "https://uscodex.org/cfr/46/182.480"
---

# §182.480. Flammable vapor detection systems.

- (a) A flammable vapor detection system required by [§ 182.410(c)](/cfr/46/182.410.md?p=c) must meet UL 1110 (incorporated by reference; see [46 CFR 175.600](/cfr/46/175.600.md)) or be approved by an independent laboratory.
- (b) Procedures for checking the proper operation of a flammable vapor detection system must be posted at the primary operating station. The system must be self-monitoring and include a ground fault indication alarm.
- (c) A flammable vapor detection system must be operational for 30 seconds prior to engine startup and continue sensing the entire time the engine is running.
- (d) A flammable vapor detection system must provide a visual and audible alarm at the operating station.
- (e) A sensor must be located above the expected bilge water level in the following locations:
  - (1) The lowest part of a machinery space;
  - (2) The lowest part of a space containing a fuel tank when separate from the machinery space; and
  - (3) **Any other location when required by the cognizant OCMI.**
- (f) A flammable vapor detection system must be installed so as to permit calibration in a vapor free atmosphere.
- (g) Electrical connections, wiring, and components for a flammable vapor detection system must comply with [part 183](/cfr/46/part183.md) of this chapter.
- (h) An operation and maintenance manual for the flammable vapor detection system must be kept onboard.

## Notes

### Amendments

[CGD 85-080, 61 FR 986, Jan. 10, 1996, as amended by USCG-2003-16630, 73 FR 65209, Oct. 31, 2008]

### Authority

Authority: 46 U.S.C. 3306; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; DHS Delegation No. 00170.1, Revision No. 01.4.

### Source

Source: CGD 85-080, 61 FR 986, Jan. 10, 1996, unless otherwise noted.

### Amendments

[CGD 85-080, 61 FR 986, Jan. 10, 1996, as amended by USCG-2003-16630, 73 FR 65209, Oct. 31, 2008]