MIL-PRF-52308J
3.2.1 Material deterioration, prevention and control. The elements shall be fabricated from
compatible materials, inherently corrosion resistant or treated to provide corrosion and
deterioration protection for the element's expected service life in any operating and storage
environment.
3.2.2 Dissimilar metals. Dissimilar metals shall not be used in intimate contact with each
other unless protected against galvanic corrosion.
3.2.3 Identification of materials and finishes. The contractor shall identify the specific
material, material finish or treatment for use with component and subcomponent and shall make
information available upon request to the contracting officer or designated Government
representative.
3.3 Interface and interoperability requirements.
3.3.1 Filter-coalescer elements. Elements shall be fabricated and assembled to the form and
dimensions shown in Figure 1 to insure proper interface and interchangeability with existing
filter/separator vessels.
3.3.1.1 End caps. The end caps shall be mounted perpendicular within 3 degrees to the
longitudinal axis of the element.
3.3.1.2 O-ring. The O-ring packing and its retaining groove shall retain the O-ring seal
during installation and operation, and the O-ring form and dimensions shall be in accordance
with Figure 2 to insure proper interface and interchangeability of the elements with existing
filter/separators. The O-ring shall be hydrocarbon fuels (automotive and aircraft types) resistant
(see 6.9). The O-ring packing shall consist of a light coating of silicone compound or other
compatible material to O-ring and O-ring grooves to facilitate installation.
3.4 Operating requirements.
3.41 Water coalescence. The filter element shall coalesce water into visible drops from the
test fuel (see 4.4.2) at a fuel flow rate of 20 gallons per minute (gal/min or GPM) (76 liters per
minute, L/min), which is hereinafter referred to as rated flow or 100% of rated flow.
3.4.2 Differential pressure and fiber migration. The differential pressure across the element,
in combination with a separator stage (see 6.4.2 and 6.5), using clean, dry fuel (see 6.4.3 and as
defined by API 1581, Table 1), shall not exceed 6 pounds per square inch (psi) (42 kiloPascals,
kPa) at 100% of rated flow. The effluent fuel sample shall contain an average of not more than
10 fibers per liter and the number of fibers in any single sample shall not exceed 15 fibers per
liter (see 6.4.1). The element shall incorporate sufficient radial support to withstand a
differential pressure across the element of not less than 75 psi (520 kPa) without structural
failure or permanent deformation.
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