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 TM 55-1925-273-10-1
0032 00
ENGINE ROOM WATER WASHDOWN SYSTEM (ERWWS)
The purpose of the ERWWS is to quickly reduce the temperature in the protected space to minimize the production of
Hydrogen Fluoride (HF) gas generated as a result of FM-200 agent contact with hot surfaces and flame above 1,300 F
(704.4 C). The sprinkler water also acts to keep smoke particulate down and expedites ventilation of the compartment
when the fire is extinguished. The ERWWS is not designed or intended to be a stand-alone fire extinguishing system. It is
designed to be used in conjunction with the installed FM-200 fire suppression system. Use of the ERWWS reduces the risk
of HF exposure by reducing temperatures within the protected space.
The ERWWS is constructed of all stainless steel components. In order to operate the ERWWS, the fire main must be
charged and, at a minimum, fire and general service pump 1 must be online at maximum operating pressure. To provide an
adequate volume of raw water for the ERWWS, valves FM-17, FIRE/G.S. PMP No. 1 DISCH TO GS and FM-15, FIRE/
G.S. PMP. No. 2 DISCH TO GS. must be CLOSED prior to activation of the ERWWS. The ERWWS requires a minimum
of 145 gal/min (548.9 L/min) at 104 PSI (7.17 bar) to operate as intended.
Activation of the ERWWS is accomplished by opening WWS-1 (figure 7, item 1). WWS-1 is located in the engine room
vestibule on the main deck at frame 25. The ERWWS shall be activated prior to actuation of the FM-200 fire suppression
system. The ERWWS is a Hydrogen Fluoride (HF) gas mitigating water washdown system that provides general overhead
coverage to the protected spaces. The ERWWS consists of simple overhead sprinkler heads (figure 8) piped directly to the
fire main. The ERWWS receives raw water directly from fire and general service pump 1. Fire and general service pump
1 is powered by the Emergency Diesel Generator (EDG) switchboard and will have to be restarted remotely from the
pilothouse once the EDG comes online.
1
OFF
JCV-PRO-3
ON
2
Figure 7. Engine Room Water Washdown Station
0032 00-6
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