---
kind: "section"
citation: "46 C.F.R. § 108.443"
title: "46"
number: "108.443"
heading: "Controls and valves."
url: "https://uscodex.org/cfr/46/108.443"
---

# §108.443. Controls and valves.

- (a) At least one control for operating a CO2 system must be outside the space or spaces that the system protects and in a location that would be accessible if a fire occurred in any space that the system protects. Control valves must not be located in a protected space unless the CO2 cylinders are also in the protected space.
- (b) A CO2 system that protects more than one space must have a manifold with a stop valve, the normal position of which is closed, that directs the flow of CO2 to each protected space.
- (c) A CO2 system that protects only one space must have a stop valve installed between the cylinders and the discharge outlets in the system, except on a system that has a CO2 supply of 136 kilograms (300 pounds) or less.
- (d) At least one of the control stations in a CO2 system that protects a machinery space must be as near as practicable to one of the main escapes from that space.
- (e) All distribution valves and controls must be of an approved type.
- (f) Each CO2 system that has a stop valve must have a remote control that operates only the stop valve and must have a separate remote control for releasing the required amount of CO2 into the space protected by the system.
- (g) Each CO2 system that does not have a stop valve must be operated by a remote control that releases the required amount of CO2 into the space protected by the system.
- (h) Remote controls to each space must be in an enclosure.
- (i) Each system must have a manual control at its cylinders for releasing CO2 from the cylinders, except that if the system has pilot cylinders, a manual control is not required for other than pilot cylinders.
- (j) If gas pressure is used to release CO2 from a system having more than 2 cylinders, the system must have at least 2 pilot cylinders to release the CO2 from the remaining cylinders.
- (k) If the entrance to a space containing the CO2 supply or controls of a CO2 system has a lock, the space must have a key to the lock in a break-glass type box that is next to and visible from the entrance.

## 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.