MIL-T-62032 Trucks, Tank: Fuel Servicing And Aircraft Fuel Servicing, 1,000 To 4,000 Gallon, Diesel And Gasoline Engine Driven, 16,000 To 50,000 Pounds Gvw, 4X2, 4X4, 6X4, And 6X6, Modified CommercialThis specification covers diesel and gasoline engine driven, four-wheel, two- or four-wheel drive, and six-wheel, four- or six-wheel drive, single or dual delivery fuel servicing and aircraft fuel servicing tank trucks, with product capacities from 1,000 to 4,000 gallons, having minimum gross vehicle weights GVW of 16,000 to 50,000 pounds for normal operating 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-62032H

4.3.10 Fluid flow tests. Test fluid shall be a clean commercial solvent with viscosity equal to gasoline or turbine fuel, but having a higher flash point and lower vapor pressure.

4.3.10.1 Bottom loading system and calibration test. Using either leg of the bottom loading adapter, at the manufacturer's option, the tank of the first production vehicle shall be loaded from empty at a rate of not less than 600 gpm through a calibrated meter. Failure of the tank to accept 600 gpm, failure of the tank compartment to accept less than its required capacity before closing of the bottom loading valve, acceptance by the tank compartment of more than its required capacity (in excess of 1 percent) or liquid contact with or liquid flow from the vents shall constitute failure of the test. The capacity marker of 3.5.10 shall be checked against the meter reading for proper setting. Upon any failure, corrections shall be made and the entire test repeated until successful.

* 4.3.10.2 Fuel servicing tests. The tank of the first production truck shall be completely discharged through the onboard meter and fuel servicing system(s) (gravity discharge for

type V). The recorded flow out through the onboard meter shall be compared to the amount of

fluid pumped into the truck to insure proper calibration of the onboard meter. During discharge, the flow rate (except on type V) shall be rapidly varied from 0 to 100 gpm for overwing refueling and closed-circuit fuel servicing and from 0 to 200 gpm for underwing fuel servicing. On

type III and IV trucks, the nozzle pressure shall be observed and the time from no-flow to

full-flow measured for conformance to 3.8.4.2.(b). For type I and III vehicles with the optional

75 gpm automatic nozzle (see 3.6.1.2), the automatic nozzle shall be replaced with a 100 gpm

nozzle for the purpose of these tests.

4.3.10.3 Self-load test. To determine conformance to 3.6.4.1, the four 10-foot lengths of hose shall be connected from the suction stub of the first production truck to a storage tank or other typical fuel source below ground level. A flow rate of not less than 100 gpm shall be maintained for a minimum of 3 minutes.

4.3.10.4 Defuel tests. The first production truck of type III and IV shall be tested to simulate defueling through the overwing and the underwing nozzles. The rate of flow during defueling shall be measured for conformance to 3.8.4.1(b), 3.8.4.1(c) and 3.8.4.2(b). The tank shall be filled to capacity during defueling to check automatic closing of the bottom loading valve during defueling.

4.3.10.5 Recirculation test. The recirculation system shall be tested for conformance to 3.8.4.5.

4.3.10.6 Deadman control. The deadman control shall be tested to insure immediate fuel flow stoppage when the control is released.