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 0031 00
TM 55-1925-273-10-1
WASHDOWN COUNTERMEASURE (WDCM) SYSTEM
The vessel has an installed WDCM system that is capable of forming a protective umbrella of raw water over the superstruc-
ture of the vessel. It is designed for protection against Nuclear, Biological, and Chemical (NBC) contaminants. If time
allows, the vessel should be wet down before an NBC attack. NBC agents would then be washed immediately overboard.
The WDCM system is more effective as a preventive measure than as a decontamination measure. Another benefit of using
the WDCM system is that it cools the external superstructure of the vessel. This can aid in removing excess heat from the
vessel in the event of fire.
SPRINKLER SYSTEMS
AMMUNITION STORAGE LOCKERS
The arms and ammunition storage locker is equipped with a flooding system designed to cool the contents in case of fire in,
near, or around the locker. However, if the surrounding area becomes heated, maintain a safe distance from the source of the
fire while applying high velocity water fog.
Temperature stability in ammunition and pyrotechnic storage areas is essential to prevent decomposition and deterioration
of stored devices. Ready service lockers and other ammunition stowage spaces are designed to maintain temperatures
within prescribed limits under normal operating conditions. The stability of smokeless powder decreases at temperatures in
excess of 100 F (37.8 C). Stowage in airtight spaces at temperatures of 70 F (21.1 C) or less is necessary to ensure
normal life of any service ordnance. Mechanical cooling is necessary if temperatures will exceed 100 F (37.8 C). If
mechanical cooling is not provided, artificial methods, such as water spray or wet canvas covers can be used to reduce the
high temperature.
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 temperature. The arms locker drenching system has to be manually
activated. The system can be activated in the boatswain's locker (local) or from the 01 level (remote) at the bow by means
of a reach rod valve system.
System activation occurs when the thermal heat detector (figure 7, item 1) senses a temperature above 105 F (40.5 C). The
thermal heat detector sends an alarm signal to the pilothouse indicating a high temperature situation in the arms locker. The
crew would then investigate the situation and if necessary, the fire main system would be charged. Once it is determined that
the alarm condition exists and the fire main system is charged, the manual activation valve (figure 7, item 2) is OPENED
either locally or remotely. As raw water enters the piping system in the arms locker, a pressure switch (figure 7, 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 7, 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.
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