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 TM 55-1925-273-10-1
0032 00
FM-200 FIRE SUPPRESSION ALARM SYSTEM
The purpose of the FM-200 fire suppression alarm system is to warn personnel on the hold deck (AMS 1, engine room, and
AMS 2) that the FM-200 fire suppression system is actuating. When the FM-200 fire suppression alarm sounds, personnel
have 60 seconds to evacuate the spaces before the FM-200 system is discharged.
The fire suppression alarm system is needed because the FM-200 agent produces Hydrogen Fluoride (HF) gas when
exposed to temperatures at or above 1,300 F (704.4 C). When the FM-200 system is actuated, ventilation to and from the
engineering spaces, the ship's service diesel generators, the fuel oil transfer pumps, and the bow thruster and pump drive
engines are automatically shut down to prevent the FM-200 agent from being extracted from the spaces. Although the FM-
200 agent itself is breathable, the atmosphere in the engineering spaces will rapidly degrade to a casualty condition as HF
gas may be present. Personnel in these spaces must have warning to evacuate or make preparations to find breathable air.
The FM-200 fire suppression alarm system is an automatically actuated alarm system. When the FM-200 system is actu-
ated, pressurized CO2 from the system's actuating circuit closes the alarm switch. This switch in turn energizes the strobe
lights, horns, and bell. Locations of the strobe lights, horns, and bell are illustrated in figure 5. Once the alarm begins to
sound, the occupants of the engine room and AMS 1 have 60 seconds before FM-200 agent is released. The FM-200 fire
suppression alarm system consists of five amber strobe lights, two horns, and one bell. Three strobe lights are mounted in
the engine room, and one each in AMS 1 and AMS 2. The alarm system bell is mounted on the weather deck aft of the
engine room access vestibule.
MESS
VESTIBULE
B
PASSAGEWAY
BOATSWAIN'S STOREROOM
GALLEY
MAIN DECK LEVEL
A
A
A
AMS 1
A
ENGINE ROOM
A
AMS 2
HOLD LEVEL
A
AMBER STROBE LIGHT
B
BELL
HORN
Figure 5. Components by Locations of the FM-200 Fire Suppression Alarm System
0032 00-4
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