Water Wash down System (WWS)

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FM-200 Fixed Fire Suppression System

TM-55-1905-223-10 Landing Craft Utility (LCU 200 Class) NSN 1905-01-154-1191 Manual

FIGURE 1-36. Countermeasure Washdown.

TM 55-1905-223-10

1-31. Water Washdown System (WWS). The WWS built of all stainless components are three (3)

separate systems installed in the Engine Room, Tunnel and Bow Thruster Room. The WWS is a

hydrogen fluoride (HF) gas mitigation, water washdown system (WWS) which provides general overhead

coverage to the protected spaces. The WWS is a simple overhead sprinkler grid which is piped directly to

the existing firemain. It receives seawater from the Bow Thruster Emergency Fire Pump (Engine Room

WWS) and two (2) Engine Room Fire Pumps (Bow Thruster Room and Tunnel WWS). The Bow Thruster

Emergency Fire Pump is powered by the Bow Thruster diesel engine and the two (2) Engine Room Fire

Pumps are powered electrically from the Ships Service Switchboard 240 V Distribution Panel.

WARNING

The WWS is not designed nor intended to be a stand alone fire

extinguishing system. It is designed to be used in conjunction

with the installed FM-200 Fixed Fire Suppression System.

The WWS, upon activation, serves to:

Quickly reduce the temperature within the protected space.

Minimize production of Hydrogen Fluoride (HF) Gas which is produced as a result

of FM-200 agent decomposition in contact with hot surfaces and flame at temperatures

above 1300 F.

Aid in scrubbing of any HF Gas generated.

Expedite ventilation of the protected space.

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