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

3.5.12.4 Vapor discharge outlet. Provision shall be made for discharging to atmosphere vapors from the vapor recovery system when vapor collection facilities are not available. The location of the outlet shall be on the top of the tank, remote from the driver's loading area, and isolated from the engine exhaust.

3.5.13 Bottom loading system. The tank shall be capable of being bottom loaded at a rate of not less than 600 gpm. To provide bottom loading capability, the tank shall be furnished with an automatic vent valve (see 3.5.11.4), a level-sensor controlled automatic flow control valve, and a bottom loading adapter with check valve. The system, including the automatic vent, shall be designed failsafe to prevent damage to the truck or any of its components if the bottom loading system malfunctions or is operated incorrectly. The system shall comply with

paragraph 4-14.3 of NFPA No. 407.

3.5.13.1 Inlet manifold. The bottom loading inlet manifold shall extend from the bottom loading adapter to the automatic flow control valve in the bottom of the tank. The complete inlet manifold system shall be sized to meet the required system filling rates and pressures.

3.5.13.2 Automatic flow control valve. An automatic flow control valve which serves as a combination bottom loading and emergency valve shall control the flow of fuel into the tank during bottom loading. The control valve shall be level-sensor controlled to shut off intake flow when the tank has reached its rated fluid capacity. A remotely operated manual control shall also be provided to open or close the valve. The automatic flow control valve operation shall be in simultaneous actuation with the automatic vent (see 3.5.11.4). The design of the control valve shall be in accordance with the emergency flow control type valve described in 49 CFR,

section 178.341-5 of MC-306, for assurance against accidental escape of contents. A deflector, in accordance with paragraph 4-14.3.8 of NFPA No. 407, shall be mounted in the tank over the flow control valve in order to prevent the fuel from spraying unrestrictedly into the tank.

3.5.13.2.1 Tank level-sensor control. The level control shall automatically shut off the automatic flow control valve when the tank is filled to its rated capacity. The level control unit shall be a hydraulic jet type sensing device utilizing line fuel pressure with a jet stream directed to a receiver. The level control shall have no moving parts but shall be adjustable to various heights from the manhole(s). A means shall be provided to precheck the level control system to determine if it is functioning properly. The level-sensing device shall be failsafe in case of line breakage or leakage. The level control system shall operate properly within the designed system pressure range and shall operate with the type of fuel specified without causing undue corrosion or deterioration of the equipment. The level sensor and any associated valves shall be free of all liquids with a freezing point above minus 50 F.