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 TM 55-1925-273-10-1
0029 00
Clean water enters the OWS's (figure 2, item 4) tank bottom, back flushing the coalescer beds and displacing the accumu-
lated oil in the upper tank zone. This oil is discharged through the oil discharge check valve. Oily waste is pumped into the
oily waste storage tank (figure 2, item 2). Clear water is discharged overboard. When the oil content in the overboard
discharge exceeds acceptable standards, the water discharge is automatically redirected to the oily waste storage tank (figure 2,
item 2).
OIL CONTENT MONITOR
An Oil Content Monitor (OCM) is provided inline the OWS's (figure 2, item 4) discharge line. When the oil content in the
overboard discharge exceeds acceptable standards, the water discharge is automatically redirected to the oily waste storage
tank (figure 2, item 2) for retreatment. The oil content level is preset. A solenoid-activated valve determines the discharge
direction of the overboard discharge.
SYSTEM OPERATION
The oily waste drain tank (figure 2, item 1) receives and holds the waste discharge from the lube oil purifier and engine
sumps. Oily waste is transferred via the oily bilge piping system and the oily waste discharge pump (figure 2, item 3) to the
oily waste storage tank (figure 2. item 2). The oily waste storage tank supplies oily water to be processed by the OWS
(figure 2, item 4). The oily waste storage tank also receives the oil discharged from the OWS. The eductor discharges the
treated water overboard. When appropriate, the oily waste discharge pump can empty the oily waste storage tank through
the shore connection (figure 2, item 5). If the OCM detects that the oil content in overboard discharge exceeds (the preset)
acceptable standards, the water discharge is automatically redirected back to the oily waste storage tank.
THE BALLAST SYSTEM
The ballast system consists of: the bilge and ballast pumps (figure 1, item 1), duplex strainer, (figure 1, item 5) ballast duplex
manifold (figure 1, item 2), ballast piping (see figure 1), and the ballast tanks (see figure 1).
BALLAST MANIFOLD
A duplex ballast manifold (figure 1, item 2) provides selection and control of the ballast system piping alignment. The
ballast manifold is connected through a simplex strainer (figure 1, item 4) to the suction side of the bilge and ballast pumps
(figure 1, item 1).
BALLAST TANK SYSTEM OPERATION
The ballast system transfers raw water to and from ballast tanks (see figure 1) utilizing and the ballast duplex manifold
(figure 1, item 2), bilge and ballast pumps (figure 1, item 1), and ballast piping to maintain balance of the vessel. Discharge
from the bilge and ballast pumps can be directed either overboard or to the ballast tanks (see figure 1).
END OF WORK PACKAGE
0029 029 00-5
000-5/6 blank
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