MIL-PRF-83041C
3.3.5 Air in vessel. The filter separator shall be capable of eliminating air in the vessel, as well as air
introduced into the vessel, out through the air eliminator, see 4.5.3.
3.3.6 Pressure loss. Any pressure loss shall not exceed 20 psi from the inlet to the outlet connection at
a flow rate of 600 gpm using 0.76 specific gravity grade JP-4, JP-5/JP-8 ST fuel in accordance with
MIL-DTL-5624 when the elements are in new condition.
3.4 Protective treatment. Materials used in the construction of the filter separator shall be protected
against corrosion and deterioration in a manner that will in no way prevent compliance with the
performance requirements of this specification. The use of any protective coating that will crack, chip,
or scale with use, age, or extremes of climatic and environmental conditions shall be avoided.
3.5 Welding. Welding shall be in accordance with ASME "Boiler and Pressure Vessel Code, Section
9", AWS B2.1-84; and AWS D1.2-83.
3.6 Assembly. Each filter separator unit shall be delivered fully assembled and shall be ready for use.
The functioning of all components shall be tested prior to shipment and no assembly or field adjustment
of valves or components shall be required before use.
3.6.1 Vessel. The vessel shall be designed and fabricated in accordance with AWS D1.2, Section 9 and
qualified to the API Bulletin 1581, Group II, Class B. Swing type bolts shall be attached to the vessel
for safety reasons to retain the cover in a lock-tight position.
3.6.2 Vessel cover. A removable vessel cover shall be provided and shall permit element replacement.
The cover shall be provided with handles to facilitate its removal and replacement, an O-ring type
gasket to ensure the filter separator seals properly and performance is met during hydrostatic pressure
test (see 4.5.2).
3.6.3 Coalescer and separator elements. Coalescer elements are to be threaded base and 6-inch
diameter. Separators are to be constructed to allow screen flow from outside-in to ensure performance
and endurance.
3.6.4 Working pressure. The vessel shall be designed for a minimum working pressure of 150 psi
and shall be constructed and labeled in accordance with Section 9 of the ASME Code for Unfired
Pressure Vessels.
3.6.4.1 Inlet and outlet connections. The inlet and outlet connections shall be 4 inch nominal pipe size.
3.6.4.2 Flow control valve. A filter separator flow control value shall be provided with the vessel and
shall match the outlet connection flange face.
3.6.4.3 Inlet pipe. The inlet pipe shall have a check valve to ensure performance.
3.6.4.4 Outlet face. The outlet pipe shall be equipped with a rate of flow control/water slug valve.
3.6.4.5 Float control assembly. The float control assembly and its integral float control tester shall
provide a means to mechanically adjust the float to verify operation of the water slug valve and integrity
of the float valve.
3.6.5 Drain. The vessel shall be equipped with a 0.750 inch manual ball valve water and fuel drain.
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