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 0031 00
TM 55-1925-273-10-1
1
4
3
T
W
W
2
P
D.C.
UP
LOCKER
M
CREW'S MESS/
DN
RECREATION AREA
BOATSWAIN'S
STORES
GALLEY
MAIN DECK
Figure 7. Arms Locker Drenching System
ENGINE ROOM WATER WASHDOWN SYSTEM (ERWWS)
The purpose of the ERWWS (figure 8) 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.
0031 00-8
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