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 TM 55-1905-223-SDC
e. Isolation valves. Isolation valves at various locations allow segments of the main to be
segregated and the pumps to be isolated from the sea chests on the main.
6-21. WASHDOWN SYSTEM. The LCU has an installed countermeasure washdown system which will
form an umbrella of sea water over the superstructure when activated for protection against nuclear,
biological, and chemical (NBC) contaminants. Additional coverage of the cargo and forecastle decks can be
accomplished by attaching hoses to weatherdeck fire stations, and strategically placing the nozzles to gain
maximum coverage. Nozzles should be in the high velocity fog position and securely lashed to a stationary
object. If possible, these hoses should be controlled from below deck cut-out valves when a NBC attack is
imminent.
If time allows, the ship should be wet down before a NBC attack. NBC agents which strike a ship
already covered with a film of flowing water are normally washed overboard. Wetting down may be
accomplished by activating the washdown system and by using fire hoses and the fire monitors.
The washdown system is much more effective as a preventive measure than as a decontamination
measure. Even if the washdown system is used only periodically to wet down the ship and is then turned off
to allow normal ship operations, the washdown is more effective than it would be if contamination had fallen
on completely dry decks.
NBC agent particles which impact on dry surfaces of the ship are not easily or completely removed by
post-attack washdown. Prompt use of the washdown system after NBC attack can remove more agent than if
the treatment is delayed. Without wetting down prior to NBC attack, use of the washdown and/or
general fire hosing will be needed as an additional countermeasure.
In areas where the runoff water flows very slowly, or collects in pools, some of the agent may adhere
to the ship and, in case of chemical agents, be absorbed by paint. When the tactical situation permits,
steaming on a zig-zag course helps to clear the ship of pools of water as the ship heels and, in addition,
improves the distribution of the washdown spray by varying the direction of the relative wind.
Section XI. FIRE FIGHTING EQUIPMENT
6-22. EQUIPMENT. Firefighting equipment is stored at various locations throughout the vessel. Types of
equipment and locations are listed below:
a. Ten pound, Type A-II dry chemical fire extinguishers:
(1) 01 Level, Port Passageway, outside 3 man Stateroom.
(2) Main Deck, Starboard side, outside Recreation Room.
(3) Provisions Storeroom, by door leading to Weather Deck.
b. Ten pound, Type B-II dry chemical fire extinguishers:
(1) Paint Locker, by door.
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