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| MIL-T-62032H
the suction stub. The return line shall be tied in with the bottom loading emergency valve for
tank fill shutoff control during defuel operation. The tank return line shall be located
downstream of the filter/separator and the contamination monitor.
3.8.5.3 Check valves. The tank return line, as well as any other piping or tubing between
the tank and pumping system except the tank-to-pump suction line, shall incorporate check
valves to prevent backflow from the tank. The check valves shall comply with 49 CFR,
section 178.340-8 of MC-306. Check valves or manually controlled valves shall also be located
at the inlet and outlet sides of the filter/separator and the contamination monitor to allow routine
servicing and replacement of filter/separator elements and fuel quality monitor elements without
draining adjacent piping.
3.8.5.4 Tank-to-pump suction line. The tank-to-pump suction line shall provide for
adequate flow and smooth operation of the pump under all conditions. The suction line shall
incorporate a line strainer and a tank shutoff valve. A flexible coupling may be provided. The
suction line shall terminate in the bottom of the tank (not in the sump area) and shall not have a
raised seat that will allow sediment and water to collect in the low point area. The product
discharge opening shall be of the emergency flow control type designed in accordance with
49 CFR, section 178.341-5 of MC-306, to assure against the accidental escape of the contents. A
readily accessible tank drain shall be provided in the low point area.
3.8.5.5 Deadman pressure control valve. A deadman pressure control valve shall be
furnished as an integral portion of the flow control system to operate in conjunction with the
pump bypass valve and line to control flow rate and pressure (see 3.8.9.3.2).
*
3.8.6 Filter/separator. A filter/separator shall be mounted in one of the underslung
cabinets in such a manner that water removal and filter/coalescer elements are readily accessible
for replacement. The filter/separator unit shall be of aluminum or stainless steel construction and
designed for a rated flow capacity of not less than 200 gpm (100 gpm for type I and II vehicles)
for fuels as specified in 3.5. The filter/separator unit shall utilize not less than 10 filter/coalescer
elements (5 for type I and II vehicles) conforming to MIL-F-52308 at a rating of not more than
20 gpm each. Performance requirements of the filter/separator unit shall be certified by the
filter/separator manufacturer to be in accordance with MIL-F-8901. All aluminum parts shall be
anodized in accordance with MIL-A-8625 or coated in accordance with MIL-C-5541, class lA.
Inlet and outlet connections shall be not less than 3-inch grooved couplings (Victaulic or equal).
The filter/separator shall be so installed in the system that all fuel during fueling and defueling
operations will pass through the filter/separator. Fuel shall pass through the filter/separator in
one direction only, under all conditions. The filter/separator unit and components shall be
mounted to minimize vibration, oscillation or swing of the various components. The air bleed
line to the tank shall be compatible with the product fuel.
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