---
kind: "range"
citation: "46 C.F.R. §§ 154.1110–154.1135"
title: "46"
from: "154.1110"
to: "154.1135"
count: 6
url: "https://uscodex.org/cfr/46/154.1110..154.1135"
---

# §154.1110. Areas protected by system.


Each water spray system must protect:

- (a) All cargo tank surfaces that are not covered by the vessel's hull structure or a steel cover;
- (b) Each cargo tank dome;
- (c) Each on-deck storage vessel for flammable or toxic liquefied gases;
- (d) Each cargo discharge and loading manifold;
- (e) Each quick-closing valve under §§ [154.530](/cfr/46/154.530.md), [154.532](/cfr/46/154.532.md), and [154.538](/cfr/46/154.538.md), and other control valves essential to cargo flow;
- (f) Each boundary facing the cargo area of each superstructure that contains accommodation, service, or control spaces;
- (g) Each boundary facing the cargo area of each deckhouse that contains accommodation, service, or control spaces; and
- (h) Each boundary of each deckhouse that is within the cargo area and that is manned during navigation of the vessel or during cargo transfer operations, except the deckhouse roof if it is 2.4 m (8 ft.) or higher above the cargo containing structure.

# §154.1115. Discharge.

- (a) The discharge density of each water spray system must be at least:
  - (1) 10000 cm 3/m 2/min. (0.25 gpm/ft. 2) over each horizontal surface; and
  - (2) 4000 cm 3/m 2/min. (0.10 gpm/ft. 2) against vertical surface, including the water rundown.
- (b) The water spray protection under § [154.1110 (d)](/cfr/46/154.1110.md?p=d) and [(e)](/cfr/46/154.1110.md?p=e) must cover an area in a horizontal plane extending at least 0.5 m (19 in.) in each direction from the pipes, fittings, and valves, or the area of the drip tray, whichever is greater.

# §154.1120. Nozzles.

- (a) Nozzles for the water spray system must be spaced to provide the minimum discharge density under [§ 154.1115](/cfr/46/154.1115.md) in each part of the protected area.
- (b) The vertical distance between water spray nozzles for the protection of vertical surfaces must be 3.7 m (12 ft.) or less.

# §154.1125. Pipes, fittings, and valves.

- (a) Each pipe, fitting, and valve for each water spray system must meet [Part 56](/cfr/46/part56.md) of this chapter.
- (b) Each water spray main that protects more than one area listed in [§ 154.1110](/cfr/46/154.1110.md) must have at least one isolation valve at each branch connection and at least one isolation valve downstream of each branch connection to isolate damaged sections.
- (c) Each valved cross-connection from the water spray system to the fire main must be outside of the cargo area.
- (d) Each pipe, fitting, and valve for the water spray system must be made of fire resistant and corrosion resistant materials, such as galvanized steel or galvanized iron pipe.
- (e) Each water spray system must have a means of drainage to prevent corrosion of the system and freezing of accumulated water in subfreezing temperatures.
- (f) Each water spray system must have a dirt strainer that is located at the water spray system manifold or pump.

# §154.1130. Sections.

- (a) If a water spray system is divided into sections, each section must at least include the entire deck area bounded by the length of a cargo tank and the full beam of the vessel.
- (b) If a water spray system is divided into sections, the control valves must be at a single manifold that is aft of the cargo area.

# §154.1135. Pumps.

- (a) Water to the water spray system must be supplied by:
  - (1) A pump that is only for the use of the system;
  - (2) A fire pump; or
  - (3) **A pump specially approved by the Commandant (CG-OES).**
- (b) Operation of a water spray system must not interfere with simultaneous operation of the fire main system at its required capacity. There must be a valved cross-connection between the two systems.
- (c) Except as allowed under [paragraph (d)](#d) of this section, each pump for each water spray system must have the capacity to simultaneously supply all areas named in [§ 154.1110](/cfr/46/154.1110.md).
- (d) If the water spray system is divided into sections, the pump under [paragraph (a)](#a) of this section must have the capacity to simultaneously supply the required discharge density under [§ 154.1115(a)](/cfr/46/154.1115.md?p=a) for:
  - (1) The areas in §§ [154.1110(f) through (h)](/cfr/46/154.1110.md?p=f..h) and [154.1115(b)](/cfr/46/154.1115.md?p=b); and
  - (2) The largest section that includes the required protection under § [154.1110 (a)](/cfr/46/154.1110.md?p=a), [(b)](/cfr/46/154.1110.md?p=b), and [(c)](/cfr/46/154.1110.md?p=c).