MIL-PRF-52666F
3.3.9.3 Air relief valve. Each F/S shall be provided with a device to manually vent trapped
air from the top of the F/S.
3.4 Environmental requirements.
3.4.1 Operational temperatures. The F/S shall permit rated flow during and after exposure to
ambient temperatures ranging from minus 25°F (-32°C) to plus 140°F (60°C).
3.4.2 Storage temperatures. The F/S shall withstand storage in temperatures ranging from
minus 50°F (-46°C) to plus 160°F (71°C), after which they shall perform as specified herein.
3.4.3 Sand and dust. The F/S shall permit rated flow during and after exposure to a desert
environment.
3.4.4 Salt Spray. The F/S shall permit rated flow during and after exposure to a salty sea
atmosphere.
3.4.5 Vibration and shock. The F/S shall withstand the vibration of being transported by a
5-ton cargo truck, over cross-country tactical terrain, at an average speed of 8 mph (13 kph) for a
total of 100 miles. The F/S shall withstand the dynamic shock of being dropped on an 8 inches
(20 cm) thick bed of dry sand, from a height of 60 inches (152.4 cm). Breakage of the frame or
damage to the F/S or components shall constitute a failure.
3.5 Interface Requirements. The F/S shall conform to the following interface requirements.
3.5.1 Filter-coalescer element. The F/S shall incorporate the Government furnished (see 3.8)
filter-coalescer element(s) conforming to Figure 2, which have a flow rate of 20 gpm.
3.5.2 Separator stages. The F/S shall incorporate Government furnished (see 3.8) separator
stages (see 6.8) for use with elements defined in 3.5.1.
3.5.3 F/S inlet and outlet interfaces. Unless otherwise specified (see 6.2), the inlet fitting for
the F/S shall be a female, quick-disconnect, cam-locking coupling in accordance with ASTM
F 122, provided with a mating dust plug and connecting chain. The outlet fitting for the F/S shall
be a male, quick-disconnect, cam-locking coupling in accordance with ASTM F 1122, provided
with a mating dust cap and connecting chain. The inlet and outlet connections' sizes shall be:
Type I
1-inch.
Type II
1½-inch.
Type III
2-inch
Type IV
4-inch
F/S that use drybreak, single sex, hose fittings and/or snap-over-center couplings may be
considered if previously approved by the contracting officer.
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