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|  MIL-T-46765(AT)
3.5.5 Tank openings.
3.5.5.1 Sewage and waste opening. The tank shall be equipped with a 125 mm (5-inch)
diameter pipe which shall be connected to the power hose reel by a flexible coupling for
discharging sewage and waste into the rear compartment.
3.5.5.2 Hydrant opening. The tank shall be equipped with a 64 mm (2.5-inch) diameter
opening which shall discharge hydrant water into the front compartment of the tank body.
3.5.5.3 Tank drain. A 100 mm (4-inch) tank drain shall be provided to empty the tank body
of water directly into a 100 mm (4-inch) diameter pipe to a tee which shall either divert water
onto the street or into the centrifugal pump for either agitating sewer basins or flushing. The
tank drain shall be located directly below the hatch cover to be accessible for cleaning. The tank
drain shall be provided with a 100 mm (4-inch) gate shut-off valve under the tank; quick release
rubber coupling to disengage the drain pipe from the tank for hoisting the tank and to prevent
vibration; a 75 mm (3-inch) gate shut-off valve and tee connection at the street discharge end.
The tee connection shall be piped into the centrifugal pump for adding water under pressure to
break solids in catch basins, wash down underground chambers, and flush streets.
3.5.6 Auxiliary engine. An auxiliary engine driven power unit operating on the same type of
fuel as the main chassis engine shall be provided.
3.5.6.1 Auxiliary engine mounting and enclosures. The auxiliary engine power unit shall be
a liquid cooled, four-stroke cycle, (two or four-stroke cycle for diesel engines) reciprocating,
industrial type. The engine shall be mounted on structural steel frame members of sufficient
length and strength for the imposed loads to provide mounting of the clutch power takeoff unit
and the hydraulic and centrifugal pumps. The entire power unit shall be enclosed and shall be
fitted with ventilation panels and hood. The total enclosure shall prevent road splash and rain.
Removable access panels, constructed with louvers for ventilation, shall be installed on each side
and secured with a spring loaded locking device. Hinges shall be bolted to cabinet doors. The
panels and doors shall not vibrate or drum. The panels and doors shall be constructed of 16 gage
(1.519 mm) (0.0598 inch) hot rolled mild steel.
3.5.6.2 Engine. The auxiliary engine shall have not less than a 4330 cm3 (264-cubic inch)
displacement and shall provide power for the hydraulic system and the centrifugal pump. The
engine shall provide sufficient power to simultaneously operate the centrifugal pump the
hydraulic baffle agitator, and the power hose reel.
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