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 TM 55-1925-273-10-1
0032 00
ARMS LOCKER DRENCHING SYSTEM
The arms locker drenching system is connected to the fire main system. The system is designed to provide raw water to the
arms locker in the event of a fire or excessive high temperatures. The arms locker drenching system must be manually
activated once the fire main has been charged. The system can be activated in the boatswain's locker (local) or from the 0-1
level (remote) at the bow by means of a reach rod valve system.
System activation occurs when the thermal heat detector (figure 11, item 1) senses a temperature above 105 F (40.5 C).
The thermal heat detector sends an alarm signal to the pilothouse indicating high temperature conditions in the arms locker.
The crew shall then investigate the situation and, if necessary, the fire main system would be charged. Once it is deter-
mined that the alarm condition exists and the fire main system is charged, the manual activation valve (figure 11, item 2) is
OPENED either locally or remotely. As raw water enters the piping system in the arms locker, a pressure switch (figure 11,
item 3) activates an alarm in the pilothouse to indicate that the arms locker drenching system has been activated. The raw
water from the fire main flows into the arms locker and out of two sprinkler heads (figure 11, item 4). Once activated, the
system will continue the flow of raw water into the arms locker until the manual activation valve is closed or the fire main
system is secured.
1
4
3
T
W
W
2
P
D.C.
UP
LOCKER
M
CREW'S MESS/
BOATSWAIN'S
DN
RECREATION AREA
STORES
GALLEY
MAIN DECK
Figure 11. Arms Locker Drenching Systems
EXTINGUISHING AGENTS
DRY CHEMICAL
The extinguishing agent dispensed from portable hand-held equipment used on the LT is dry chemical based (figure 12).
Dry sodium bicarbonate chemical is non-toxic, non-corrosive, and non-abrasive. It can be used effectively on oil fires, and
it is four times more effective than equal weights of CO2 in extinguishing a flammable liquid fire. Dry chemical is also
effective on electrical fires. Because the agent has little effect on the removal of heat, repeated applications may be required
to prevent the fire from reflashing. Dry chemical is the most effective hand held extinguisher in combating an oil spray fire.
The effective range of this agent is 13 to 22 feet (4 to 6.7 meters). Dry chemical can cover a large area, but the residue left
behind is difficult to remove.
0032 00-9
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