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 TM 55-1905-219-14-8
4-15. SEWAGE SYSTEM - MAINTENANCE INSTRUCTIONS (Continued).
(Continued)
d. All personnel should be encouraged to wash their hands on exit from a sewage handling area
or after being in contact with sewage handling equipment.
a. General. The sewage collection system uses a limited amount of flush water, and is used in conjunction
with a suitable holding tank. In addition, with proper valving, the wastes can be directed overboard when the
vessel is operating in unrestricted waters. The collection system consists of controlled volume flush (CVF)
urinals and commodes, macerator/transfer pumps, and a timing circuit to control the operation of the pumps.
b. Operation. Operation of the system is as follows:
(1) Wastes are collected in the controlled (limited) volume flush urinals or commodes, which use 1 pint and
3 pints of flush water respectively; this results in a water savings of approximately 90 percent over conventional
flushing systems.
(2) Each time a controlled volume flush (CVF) commode or urinal is flushed, a switch turns on the
macerator/transfer (M/T) pump for approximately ten seconds; the duration of M/T pump operation is controlled
by a time delay relay within the control panel enclosure.
(3) The macerator/transfer pumps reduce the wastes to a homogenous slurry and transfers them to a
holding tank, which is pumped out at suitable facilities when full.
c. The following is an index to the sewage system maintenance instructions.
DESCRIPTION
PARAGRAPH
Sewage Pump
Macerator/Transfer Pump
Sewage Air Pump
Toilet
Urinal
Flush Valve
4-624
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