4" FIRE HOSE (HARD RUBBER
SUCTION HOSE MAY BE USED
IF AVAILABLE)
THIS DISTANCE AS
LOW AS POSSIBLE
3" HARD RUBBER
SUCTION HOSE
DIFFERENCE IN
WATER LEVEL
2-1/2" FIRE HOSE
55 FEET OR LESS
4" EDUCTOR
COMBINATION FOOT
(DISCHARGE
VALVE AND STRAINER
SIZE)
DCf053 2
Figure 5-32. A typical P-100 dewatering configuration.
with submersible pumps when floodwater is being
The P-100 pump should be stowed on the damage
pumped. Some pumps of this type are mounted
control deck or above. No more than one single pump
semipermanently with the discharge connected to a
will be stored within a single main watertight division.
drainage system.
One pump, complete with all accessories, will be
stowed for ready transfer off the ship for rescue and
assistance use. The P-100 pump has a total dry weight
of 106.9 pounds; therefore, one person should not
attempt to move it alone.
Various types of maintenance will be required to
maintain the P-100 pump in operating condition, such
as cleaning, inspection, lubrication, and testing.
Maintenance will be accomplished according to
PMS. Repairs may also be necessary and should only
be accomplished by trained personnel, using
a p p r ove d p r o c e d u r e s f r o m t h e m a n u fa c t u r e r 's
technical manual.
DCf0533
PORTABLE SUBMERSIBLE PUMPS
Figure 5-33. Ac portable electric submersible pump.
The portable submersible pump (fig. 5-33) used
To dewater a compartment with a submersible
aboard naval ships is a centrifugal pump driven by a
pump, lower the pump into the water using the attached
water-jacketed constant speed ac electric motor and
nylon handling line and lead the 2 1/2-inch discharge
may be designed to operate as single or three phase at
hose to the nearest point of discharge. This may be an
120, 240, or 440 volts. This design is rated to deliver
emergency overboard discharge connection, found on
140 gallons per minute against a maximum head of
the damage control deck. The amount of water taken
70 feet and 180 gallons per minute at a 50 foot static
from a flooded space increases as the discharge head
head. This output is variable and will increase with a
decrease in head pressure. Strainers are always used
decreases. Therefore, dewatering is accomplished
5-18
