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

3.8.6.1 Pressure vessel. The filter/separator pressure vessel shall be in accordance with MIL-F-890l and ASME Boiler and Pressure Vessel Code, section VIII. The pressure vessel shall be designed for a working pressure equal to or greater than the maximum pressure encountered during operation of the pumping system. The pressure vessel shall be hydrostatically tested at

1.5 times the maximum working pressure. The pressure vessel flange gasket shall be of the

0-ring type. The main vessel shall be provided with lifting devices capable of lifting the entire

filter/separator assembly.

3.8.6.2 Air eliminator. An air eliminator shall be provided to allow automatic purging of air from the filter/separator. The air eliminator shall be vented into the bottom of the cargo tank. A check valve shall be provided in the air eliminator line to prohibit the back flow of product fuel. The air eliminator shall be of the manufacturer's recommended size to allow proper air elimination, but shall be not less than 0.75 inch in diameter.

3.8.6.3 Water slug control. A water slug control shall be provided. The water slug control shall stop the fuel flow when a predetermined water level is reached in the pressure vessel and shall then permit fuel flow when the water level is lowered to a predetermined level.

The water slug detector shall be capable of being positively tested by exposing the detector probe

to water, without contaminating existing fuel in the tank, and without removing the detector probe from the vehicle. The water slug detector system shall be a Parker Hannifin part number F716 or equal.

3.8.6.4 Automatic and manual water sump drain. An automatic water sump drain shall be furnished and shall be either an aluminum or stainless steel vessel or an integral part of the filter/separator. The sump drain shall be provided with an automatic water discharge and a manually operated drain. The automatic water sump drain shall discharge accumulated water from the filter/separator. Provisions shall be made to discharge accumulated water to the ground. The water sump shall be structurally supported to prevent vibration on any fitting.

3.8.6.5 Liquid level indicator. A transparent liquid level indicator having a travel of approximately 2 inches and containing a 0.25 inch diameter red or black polypropylene float, and suitable for observing the water accumulation, shall be provided and attached directly to the vessel. The midpoint of the indicator shall be located at a level at least 1 inch below the bottom

of the filter/coalescer elements.

3.8.6.6 Differential pressure gage. The filter/separator shall be connected to a differential pressure gage. The gage shall indicate the pressure drop across the first and second stages of the filter/separator. The gage shall be located such that it is visible to the operator during refueling. The gage shall range from 0 to 25 psi, with a green background below 20 psi and a red background above 20 psi.