MIL-T-46765 Trucks, Tank: Sewage And Waste, Dump Type, 4550 And 7570 Liter 1200 And 2000 Gallon, Modified CommercialThis specification covers diesel and gasoline engine driven trucks equipped with a hydraulic lift dump tank, an auxiliary engine driven centrifugal pump, and associated hoses and equipment for loading and unloading the dump tank with sewage and waste materials. The vehicle is capable of cleaning sewers, septic tanks, catch basins, manholes, and sludge pits. The trucks have minimum gross vehicle weights GVW of 11 350 kilograms kg 25,000 pounds in a four wheel, two wheel drive 4x2, 4550 liter L 1200 gallon size; and 15 650 kg 34,500 pounds in a six wheel, four wheel drive 6x4, 7570 L 2000 gallon size; for normal rating conditions. Vehicles procured under this specification are commercial items which are warranted by the manufacturer as specified in acquisition documents.

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MIL-T-46765(AT)

not less than 690 kilopascals (kPa) (100 pounds per square inch (psi)) pressure to the eductor nozzle and the agitator hose.  The pump shall be capable of pumping water directly from underground, through the pump, and into the tank.  The centrifugal pump shall be coupled with a flexible coupling to the output shaft of the power takeoff unit.

3.5.8.1  Centrifugal pump components.  Centrifugal pump components shall include the following:

(a)   Suction and pump cleanout ports

(b)   A 6.4 mm (.25-inch) air cock installed on the top of the impeller shell to evacuate air

from the suction line.

(c)   A 31.4 mm (1.25 inch) drain plug installed on the bottom of the shell to drain the

pump

(d)   A 25 mm (l-inch) pipe thread opening in the 75 mm (3-inch) pump discharge to locate

a 25 mm (l-inch) pipe nipple and shut-off gate valve to which the agitator hose assembly is attached

(e)   Provision for attaching the underground suction hose (see 3.5.9.6) to the pump suction intake.

3.5.9  Hoses.  All pressure, suction, and discharge hoses shall withstand the intended usage without cracking, collapsing, or swelling and shall have a smooth bore.

3.5.9.1  Tank discharge hose.  One 7600 mm (25-foot) length of 64 mm (2.5 inch) discharge hose with quick disconnect cam lock couplings shall be furnished to discharge water from tank body onto street or basin.  A means shall be provided while discharging water from tank body or basin while under pressure to prevent hose from jerking.

3.5.9.2  Tank fill hose.  One 3530 mm (10-foot) length of 64 mm  (2.5 inch) diameter, collapsible fill hose shall be provided and one end shall have a screw-on type coupling compatible with the tank-fill inlet, and the opposite end shall be fitted with an American Standard Taper pipe threaded coupling, so that prior to filling tank, a suitable coupling may be attached for hydrant filling.

3.5.9.3  Suction hose.  A suction hose shall be provided and installed as a coupling to prevent vibration between the tank discharge drain tee and the centrifugal pump.

3.5.9.4  Pressure hose.  A 75 mm (3-inch) inside diameter (id) pressure hose not less than

5190 mm (17 feet) long shall be provided for connection to the pump discharge and the eductor

housing assembly.

3.5.9.5  Sand suction hose.  A 100 mm (4-inch) id, smooth bore, wire reinforced sand suction hose not less than 7600 mm (25 feet) in length, shall be furnished.  One end of the hose shall be connected to the power hose reel for discharging contents from sewer into rear of tank through

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