MIL-PRF-15618H (SH)
3.5 Physical requirements.
3.5.1 Size and weight. The size and weight of the filter-separator assembly shall meet the specified flow
capacity (see 3.4.1) and all other requirements of this specification.
3.5.2 Air eliminator. When specified (see 6.2), an air eliminator meeting the requirements of API/IP 1581 shall
be provided. The air eliminator shall be removable for maintenance.
3.5.3 Water-slug shutoff. The filter-separator assembly shall be provided with a means of automatically
stopping fuel discharge from the vessel when water in the sump exceeds the capacity of the drain system. The
device shall automatically revert to normal operation of the filter-separator during release of and after water is
drained. The water-slug shutoff shall be designed to secure filter-separator effluent upon failure of the automatic
device. A means of periodically testing the water-slug shutoff feature (without adding water) shall be provided.
3.5.4 Manual sump drain. A manually operated drain shall be installed at the low point of the filter-separator
sump. The sump shall be fitted with an anti-vortex device to inhibit discharge of fuel with the water.
3.5.5 Automatic sump drain (optional). When specified (see 6.2), an automatic drain shall be installed in the
sump drain line to automatically drain water during normal filter-separator operation. The automatic sump drain
shall be designed to secure drain line flow upon failure of the automatic device. A means of isolation shall be
provided upstream of the automatic drain device to permit maintenance. A visual flow indicator shall be provided
downstream of the automatic drain device and shall be removable for maintenance.
3.5.6 Sampling connections. Sample connections shall be provided at the filter-separator inlet, outlet, and
sump to permit taking of fuel samples under flow conditions.
3.5.7 Level indication. A level indicating device shall be provided for observing water accumulation in the
sump. The range of indication shall extend as close as possible to or below the bottom of the sump and shall provide
indication of the cleavage line between the fuel and water. A means of isolation and draining shall be provided.
3.5.8 Pressure indication. Pressure indicating devices shall be provided for observing the filter-separator inlet
and outlet pressures. A differential pressure gage shall be installed with an audible alarm to alert operator when
pressure has reached prescribed limits across each stage of filtration, and display the pressure drop across each stage.
A means of isolation shall be provided for maintenance of gages.
3.5.9 Accessibility and location. All components requiring manual operation or periodic maintenance shall be
easily accessible. Indicators shall be located within view of components requiring operation.
3.5.10 Fabrication. The filter-separator assembly shall be fabricated in accordance with the ASME Boiler and
Pressure Vessel Code, Section VIII, Pressure Vessels. Pipe thread connections shall not be used. Silver braze and
solder joints shall not be used. Permanent joints shall be welded. Mechanical joints required for disassembly shall
be flanged (2-inch NPS and larger) or union (below 2-inch NPS).
3.6 Interface requirements.
3.6.1 Inlet and outlet connections. Filter-separator assemblies shall have horizontal, flanged inlet and outlet
connections in accordance with ASME B16.5. Inlet and outlet connections shall be permanently marked. End
connection size and type, shall be specified by the purchaser (see 6.2k).
3.6.2 Fuel types. The filter-separator assembly shall meet the requirements of this specification when operated
with the following fuels:
Type
NATO code no.
Specification
JP-5
F-44
MIL-DTL-5624
Naval distillate
F-76
MIL-PRF-16884
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