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TM 55-1905-220-14-8
4-15.
SEWAGE SYSTEM - MAINTENANCE INSTRUCTIONS.
a. General. The sewage handling system is a vacuum, flush-type, employing a centralized vacuum
collection tank into which two water closets and one urinal evacuate.  The system consists of a vacuum
collection tank assembly, one urinal, one urinal discharge valve and two water closets. The tank contents are
pumped out to a shore-based holding tank or sewer line.
b. Description.
(1) The shipboard collection disposal system, utilizes vacuum or differential pressure to move the
flushed 'black-water' to the collection tank. Black water is pumped from the collection tank to a shore based
installation for disposal. A control panel, located on the collection tank assembly, provides for semi-automatic
operation of the collection system.
(2) Vacuum pumps evacuate the collection tank and influent lines to the water closets and urinal
discharge valve. A pressure sensing switch controls the pumps to maintain a low pressure of 13 to 16 inch Hg.
Upon actuation and opening of a water closet valve, the sewage is pushed through the influent line or piping to
the collection tank.
(3) Liquid level sensors control the level indicator lights. Manually operated valves are strategically
located throughout the system to direct flow for various modes of operation and to isolate components requiring
servicing or maintenance. In an emergency situation the tank can be emptied by air pressure applied at the
tank top.
HIGH VOLTAGE is used in the operation of this equipment.
DEATH ON CONTACT may result if personnel fail to observe safety
precautions.
Never work on electrical equipment unless there is another person nearby
who is familiar with the operation and hazards of the equipment and who is
competent in administering first aid.
Whenever possible, the input power supply to the equipment must be shut
off before beginning work on the equipment.  When working inside the
equipment, after power has been turned off, always ground every part before
touching it.
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