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

3.8.4.2 Underwing (single point) fuel servicing operations. The pumping system shall function as follows:

(a) Refuel from the tank through the filter/separator, the contamination monitor, the meter, the 2-inch pressure servicing hose, and the 2.5 inch underwing nozzle at any flow rate from zero to 200 gpm, while automatically maintaining 50 5 psig nozzle pressure at the inlet side of the nozzle. Once the pumping system pressure controls have been adjusted, the flow rate shall be regulated on demand ahead of the underwing nozzle. The system shall automatically recover from an externally induced no-low condition to full flow within 15 seconds after the full flow demand condition has been re-established. During pressure (underwing) refueling operation, the pumping system shall limit the total pressure at the inlet to the underwing nozzle to 120 psig at any initial flow rate from 0 to 200 gpm when the flow is shut off in

0.5 second;

(b) Defuel from the aircraft through the 2.5 inch underwing nozzle, the 2-inch hose, the

filter/separator, the contamination monitor, and into the tank at flow rates up to

80 gpm.

3.8.4.3 Closed-circuit fuel servicing operations. The pumping system shall refuel from the tank through the filter/separator, the contamination monitor, the meter, the 2-inch hose, and the 1.5 inch closed-circuit nozzle at any flow rate from zero to 100 gpm, while automatically maintaining 15 2 psig nozzle pressure at the nozzle outlet.

3.8.4.4 Self-loading operation. The truck shall be capable of self-loading (loading by use of the on-board pumping system) at a rate of not less than 200 gpm. Self-loading shall be accomplished through use of the suction stub specified in 3.5.21 and the 10-foot hoses specified

in 3.5.23.

3.8.4.5 Recirculation operations. The truck shall have the capability of recirculating contaminated fuel through the filter/separator, the contamination monitor, and back into the tank. The 2.5 inch underwing nozzle on the 2-inch hose shall be connected to a fitting with a check valve on the driver's side of the tank to perform fuel recirculation.

3.8.5 Type III fuel system components.

3.8.5.1 Pump bypass valve and line. An automatic pump bypass valve and line shall be an integral part of the flow control system. The pump bypass valve shall serve to divert excess fuel flow to the inlet side of the pump to control fuel pressure. The bypass line shall be located upstream of the filter/separator and contamination monitor. The bypass system shall prevent engine speed changes of more than 300 rpm between the full-flow and no-flow for any pumping mode, except defuel.

3.8.5.2 System tank return line. In addition to the pump bypass, a tank return line shall

be provided. The return line shall allow return of fuel to the tank during defuel and during use of