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

18 inches of water is reached. (Opening the bottom loading valve will open the

automatic vents specified in 3.5.11.4 thus pressurizing the vapor recovery line and the manometer.) Leave the bottom loading valve open. Close all other valves. Insure that test fluid is not draining back through the bottom loading check valve.

(d) The pressure decay over a 5-minute period shall be observed for conformance to the

1 inch of water requirement of 3.5.11.1(a).

(e) Bottom load additional test fluid into the tank observing the manometer and the

vents to insure that the vents do not open before 18 inches of water is reached and that the vents do open before 27.7 inches of water is reached (see 3.5.11.1(b)).

(f) Drain test fluid from the tank until a negative pressure differential of 6 inches of water is reached and hold at that level.

(g) The pressure increase over a 5-minute period shall be observed for conformance to the 1 inch of water requirements of 3.5.11.1(a).

(h) Drain additional test fluid from the tank observing the manometer and the vents to insure that the vents open before a vacuum of 10.4 inches is reached

(see 3.5.11.1(c)).

(i) Similar tests conducted by pressurizing the tank through an air hose connected to the

bottom loading flange are not acceptable since vacuum tests on the entire tank cannot be performed using this method.

4.3.8 Emergency venting. The exposed surface area of each tank compartment shall be measured and the capacity of each vent determined by its required stamping and certification

(see MC-306). The total venting capacity shall be calculated and compared to the surface area to

determine conformance to the requirements of 49 CFR, section 178.341, specification MC-306.

4.3.9 Parking brake check. On the first production vehicle, for vehicles with air brakes, the parking brake control in the truck cab shall be set in the "OFF" position. A 4-inch API coupler shall be connected to the bottom loading adapter. The brakes shall be observed to insure that they apply. The brakes shall be released and the test repeated with a 2.5 inch D-I type underwing nozzle connected to the bottom loading adapter. On type III and type IV trucks, the brakes shall be released and the underwing nozzle removed from its stowage bracket. The

brakes shall be observed to insure that they apply. The override toggle switch on the truck cab instrument panel shall be checked to insure it overrides the brake interlock only of the underwing nozzle stowage bracket. For vehicles with hydraulic brakes, the parking brake control in the cab shall be placed in the "OFF" position and attempts made to connect the 4-inch API coupler and then the 2.5 inch D-I type underwing nozzle to the bottom loading adapter. The ability to make either connection with the parking brake off shall constitute failure of the test. The test shall be repeated with the parking brake set and connection(s) shall then be possible.