MIL-PRF-52666F
3.3.3 Flow conditions. The F/S shall meet the performance requirements as specified herein
on an intermittent and continuous flow basis. The F/S shall continue to perform satisfactorily
when subjected to pressure surges resulting from supply pump start and stop, and the opening
and closing of dispensing nozzles and system valves.
3.3.4 Chemical and biological threats. The F/S shall survive chemical or biological attack
and be capable of being decontaminated using standard agents and procedures. There is no
requirement for nuclear hardening.
3.3.5 Hydrostatic pressure. Each F/S, as a minimum, shall be capable of withstanding the
hydrostatic test pressure specified for a period of 10 minutes:
Type I
60 psi (4.14 bars)
Type II (both classes)
115 psi (7.93 bars)
Type III
115 psi (7.93 bars)
Type IV
225 psi (15.52 bars)
The maximum working pressure shall be equal to 2/3 of the hydrostatic pressure.
3.3.6 Differential pressure. The differential pressure measure across the inlet and outlet
couplings of the F/S, with the filter-coalescer element(s) and separator stages installed, shall not
exceed 10 psi at any flow rate up to 115 % of rated flow. The differential pressure without the
filter-coalescer element(s) and separator stages installed shall not exceed 5 psi.
3.3.7 Differential pressure dial gauge. Each F/S shall be provided with a differential pressure
dial gauge or device that shall provide the actual reading of differential pressure across the F/S
without manipulation of valves or subtraction of pressure readings. Accuracy of the gauge or
device shall be plus or minus 2 psi (± .138 bars).
3.3.8 Adapter and sampling probe. When specified (see 6.2), each of the F/S, except the
Type I F/S, shall be furnished with an adapter and sampling probe that can be used on the outlet
side of the F/S. Figure 1 is an example of a suitable adapter. The sampling probe shown in the
figure shall be as specified in ASTM D 2276 and ASTM D 3240. See 3.5.3 for the coupling
interface size.
3.3.9 Controls.
3.3.9.1 Water drain valve. Each F/S shall be provided with a device to drain the water before
it reaches the bottom of the element(s). There shall be no leakage when the device is not
functioning to discharge water.
3.3.9.2 Water level sight gauge. Each F/S shall be provided with a device that shall show the
amount of water within the F/S. A mark on this device shall be provided to indicate when the
water should be discharged.
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