MIL-F-52429F
3.4.4 Reliability.
The specified mean-time-between-fa~lure (MTBF) shall
be 140 hours when the filter-separator is operated at rated capacity and
tested as specified in 4.6.4.
3.4.5 Transportability.
The filter-separator shall withstand the dynamic
vibrational stresses encountered in transportation and service. The
filter-separator shall operate as specified herein when tested as specified in
4.6.5.
3.5
Performance.
3.5.1 Vessel (tank) . The filter-separator vessel shall be fabricated of
aluminum alloy as specified on the drawings.
The vessel shall withstand a
hydrostatic pressure of 60 psi (4.14 bars) for a period of 10 minutes without
leakage, permanent deformation, or other defects that could harmfully affect
the performance and serviceability of the filter-separator.
3.5.1.1 Fuel inlet manifold. The fuel inlet manifold shall be fabricated
of aluminum alloy as specified on the drawings.
The manifold shall withstand
a minimum of 30 psi (2.07 bars) for a period of 10 minutes without leakage,
permanent deformation, or other defects that could harmfully affect the
performance and serviceability of the filter-separator.
3.5.2 Differential pressure. The maximum differential pressure across the
filter-separator shall not exceed that specified by MIL-F-8901, table III (see
4.5.2.1a).
.
3.5.3 Reusable separator stage.
The reusable separator stage shall be as
specified by MIL-F-8901, table 111, and as specified on the drawings. The
direction of flow shall be inside-to-outside (see 4.5.2.1b).
3.5.4 Water removal.
The filter-separator shall remove water as specified
by MIL-F-8901, table III from influent fuel containing up to one percent (by
volume) water (see 4.5.2.1c) . The discharge water shall contain not more than
O 50 percent fuel by volume.
3.6 Differential Pressure dial gauge.
The differential pressure gauge
shall conform to the dimensions shown and the requirements specified on the
applicable drawing.
The gauge shall provide the actual reading of the
differential pressure across the filter-separator without manipulation of
valves or subtraction of readings, and shall perform without structural
fallure or leakage.
The accuracy of the gauge shall be such that any error
psi (0.138 bars).
shall not exceed
3.7 Government furnished property.
The media shall consist of one
filter-coalescer element conforming to MIL-F-52308, and one canister as shown
on the applicable drawings. The Government shall furnish two filter-coalescer
elements conforming to MIL-F-52308 for each filter-separator in the contract
or purchase order (see 6.4) , one to be installed in the filter-separator and
one as replacements (see 5.1.1).
3.8 Hardware.
Bolts, nuts, and washers that do not come into contact with
the flowing fuel being processed shall be fabricated from materials as
specified on the applicable drawings.
When ferrous materials are specified,
the bolts, nuts, and washers shall be aluminum coated in accordance with
MIL-C-81740, type II, class 1, or MIL-C-83488, type II, class 2
Threads
shall conform to FED-STD-H28.
3.9 Cover gasket replacements.
One O-ring, as specified on the applicable
drawings, shall be furnished with each filter-separator in the contract or
purchase order as replacement items (see 5.1.2).
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