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 suppres-
sion alarm sounds, personnel have 60 seconds to evacuate the spaces before the FM-200 system is dis-
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, ventila-
tion 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 actuated, 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 9. 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.
MAIN DECK LEVEL
AMBER STROBE LIGHT
Figure 9. Components by Locations of the FM-200 Fire Suppression Alarm System