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 TM 55-1925-273-10-1
OPERATOR'S MANUAL
INLAND AND COASTAL LARGE TUG (LT)
THEORY OF OPERATION
FIRE MAIN, WASHDOWN, AND SPRINKLER SYSTEMS
GENERAL
The fire main, arms control room sprinkler, general service and fire fighting system, and the Engine Room Water Washdown
System (ERWWS) protect the LT from fire damage. The ERWWS is designed to be used in conjunction with the FM-200
fixed fire extinguishing system. Refer to WP 0032 00 for details on the FM-200 fire suppression system. The Wash Down
Counter Measure (WDCM) aides in eliminating Nuclear, Biological, and Chemical (NBC) contamination from the vessel's
exterior.
FIRE MAIN
The fire main is made up of two electrically driven pumps and one diesel engine-driven pump. The two electric fire
pumps, located in AMS 2, are rated at 250 gal/min (946 L/min) with a discharge pressure of 125 PSI (8.6 bar). The
diesel engine-driven fire pump is located in AMS 1. It is rated at 1000 gal/min (3785 L/min) with a discharge
pressure of 125 PSI (8.6 bar). A local start/stop control for all pumps is provided, and each pump can be controlled
from the pilothouse.
FIRE MONITORS
Three fire monitors (figure 1) are provided primarily to fight fires on other vessels when rendering aid. The monitors are
located on the top of the pilothouse to provide 360 degree coverage of the vessel. Each monitor is rated at 500 gal/min
(1893 L/min) with a 100 PSI (6.9 bar) discharge pressure. The monitors are capable of directional and elevation control,
and they can dispense both raw water and Aqueous Film-Forming Foam (AFFF). The diesel engine-driven pump is required
when operating more than one fire monitor.
AFFF is also known as "light water." It is synthetic, film-forming foam designed for use in shipboard firefighting systems.
When used properly, it provides a vapor seal over a fuel spill, and it is designed to extinguish class BRAVO fires. AFFF is
a highly effective extinguishing agent for smothering large fires, particularly those in oil, gasoline, and jet fuels. The foam
proportioning equipment in combination with the fire monitors and diesel engine-driven pump generate a very effective
foam blanket. AFFF is equivalent to raw water when it is used to extinguish class A fires.
Figure 1. Fire Monitor
0031 00-1
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