MIL-PRF-83041C
3.6.12.5 Automatic air eliminator. An automatic air eliminator shall be installed on the highest point of
the vessel and shall have a check valve feature. An air eliminator shall be provided with an orifice
maximum 0.1250 inch, capable of operating at the pressure rating of the vessel. The liquid fuel and the
liquid fuel formed from the mist shall be returned to the filter separator through the vapor trap inlet
connection during the draining or defueling operation. The air eliminator shall be designed so that
while under a fuel pressure of 0.250 and 150 psig (pounds per square inch gauge) it will discharge
introduced air without discharge of liquid fuel. The air eliminator shall not leak when the vessel is
completely filled with fuel and pressure is raised to 150 psig and shall be capable of performing in
ambient temperatures ranging from -65° to +130°F. An air eliminator drainpipe to the outlet flow shall
also be provided in order to drain the sump tank.
3.6.12.6 Sampling connections. Sampling connections shall be provided at the inlet and outlet
connections to the housing. Each sampling connection shall consist of the following: 0.250 inch ball
valve, 0.250 inch quick disconnect coupling and dust cap. The sampling connections shall be capable of
accepting a sampling kit for drawing the samples required to assure fuel quality.
3.6.13 Spider assembly. Each filter separator shall contain a spider assembly to hold the coalescers and
separators in position, to support them firmly against vibration. The method of stabilization shall assure
an electrical bond between the spider and the vessel.
3.6.14 Coalescer and separator cartridges. Each filter separator shall be provided with coalescers and
separators that have been qualified to the performance requirements of API Bulletin 1581, for Group II,
Class B equipment.
3.6.15 Flow limiter water slug valve. A flow limiter water slug valve shall be provided which will limit
the maximum flow to 660 +10 gpm and stop the fuel flow when predetermined water level is reached in
the vessel and then permit fuel flow when the water level is lowered to a predetermined level. The
pressure loss across the valve shall not exceed 10.4 psi during flow of 0.76 specific gravity grade JP-4
fuel in accordance with MIL-DTL-5624 at a flow rate of 600 gpm ±10 gpm. The float actuated pilot
valve shall be located in the vessel.
3.6.16 Differential pressure gauge. The housing shall be equipped with a direct reading, piston type,
differential pressure gauge that measures the differential pressure across both coalescers and separators.
The gauge shall consist of a spring supported, corrosion resistant piston moving inside a glass cylinder,
with high pressure applied on top of the piston and low pressure applied below it. Under a differential
pressure of 30 psi, leakage past the piston shall not exceed 120 drops per minute. The cylinder shall
have end flanges with O-ring seals. The high-pressure inlet of the gauge shall have a 10 micron pleated
paper filter and the low pressure of 300 psi with a cylinder burst pressure minimum 1200 psi.
Differential pressure range of the gauge through approximately 3 inches of piston movement shall be 0-
30 psi with an accuracy of +0.5 psi, calibrated linearly with 1.0 psi scale graduations. High and low
pressure connections shall be 0.2500 inch NPT female with a bar stock valve at each connection.
Construction of the gauge shall be such that a 3 valve manifold is not necessary. If only one bar stock
valve is closed, the gauge shall not be damaged by up to 3000 psi differential pressure in either
direction. The differential pressure gauge shall be attached to the filter separator by a gauge panel.
3.6.17 Filter separator outlet connector. The quick disconnect outlet connector shall be provided with a
dust plug and a 0.0625 inch diameter security wire rope that is nylon jacketed. The outlet connector
shall be located downstream of the flow limiter water slug valve, shall be horizontal within the envelope
dimensions of the base (see 3.6.3), and located to permit each attachment of the 4 inch hose. The
connector shall prevent the hose from rubbing against sharp corners or edges, which could cause
damage to the hose.
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