MIL-S-4953C(USAF)
3.8 Main storage tank. The spray outfit shall be equipped with a main storage tank of 24 gallons capacity. The tank shall be constructed of sheet metal having a minimum thickness of Number
11 (0.1196 inch) manufacturer's gage and shall be hot dip galvanized after fabrication. A filler neck and cap shall be provided on the tank. The main storage tank shall supply the compound
to the 12 gallon auxiliary tank by gravity. An air vent shall be provided in the tank to permit air and vapors to escape. The air vent shall be designed to preclude the entry of foreign particles in the tank. The tank shall be valved for drainage. A liquid level indicator shall be provided to accurately determine the quantity of oil in the main tank at all times.
3.9 Auxiliary tank. The auxiliary tank shall have a minimum capacity of 12 gallons.
The tank shall be of all welded construction having a minimum thickness of Number 11 (0.1196 inch) manufacturer's gage and shall be designed to withstand twice the hydrostatic pressure of the compound. The tank shall be insulated so that the heat loss will be minimum. An air vent shall be provided in the auxiliary tank to vent into the space above the compound in
the main storage tank for cleaning purposes. The tank shall be hot-dip galvanized after fabrication. Ports shall be provided in the tank for cleaning purposes. The tank shall be provided with the discharge line above the electric heaters.
3.9.1 The tank shall have provisions for immersion or cartridge-type electric heaters. The tank shall be piped and valved to permit the recirculation of the compound or oil through the hoses and return to the tank. The tank shall be provided with fittings and valves for attaching the
delivery hoses. The tank shall be designed so that the electric heaters are covered with compound or oil under all operating conditions. The tank shall be provided with a valve to permit the entire tank to be drained.
3.10 Electric heater. An immersion or cartridge-type heater shall be provided in the auxiliary tank for heating the corrosion-preventive compound or the preoiling fluid. The heater shall be of sufficient wattage to heat the corrosion-preventive mixture from 30° to 235°F ±15°F or preoiling fluid from 30° to 170°F ±10°F in 30 minutes without burning or carbonizing the compound or oil. The heater shall be suitably located in the auxiliary tank to give an equal distribution of heat to the compound or oil and prevent scorching.
3.10.1 The heater shall operate on a 220 volt (V) 60 cycle, single phase power source. It shall be wired for operation from an outside power source or from the alternator on the unit. The heater shall not require more than 5,000 watts maximum.
3.10.2 The heater shall be placed in the auxiliary tank in a manner to permit ease of removal for repair or inspection.
3.11 Pump(s). The pump(s) shall be of the positive-displacement rotary-gear type. The pump(s) shall have a capacity for delivering preoiling fluid of not less than 180 gph at 80 psi and corrosion-preventive compound at 10 gph at 150 psi. If two pumps are provided, they shall be equipped with the necessary switches and instructions and diagrams to show their correct operation.
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