MIL-PRF-15618 Filter-Separator, Fluid, Pressure, Aviation And Distillate Fuel, Naval ShipboardThis specification covers filter-separator assembly \(see 6.5.2\) for use in shipboard fuel systems. The filter-separator assembly described in this specification, with filter elements qualified to MIL-PRF-32148, is intended for use onboard Naval ships to remove solids and water from fuel systems. These filter-separator assemblies are used with JP-5 fuel for aircraft, Naval Distillate or JP-5 for propulsion and auxiliary power gas turbines, Naval Distillate or JP-5 for diesel engines, and other miscellaneous internal combustion engines.

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MIL-PRF-15618H (SH)

3.6.3 Element spacing. Element spacing shall meet the requirements of API/IP 1581.

3.6.4 Element mounting. Element mounts shall be installed such that removal and installation of elements does

not cause mount to rotate or loosen and a tight seal to the mounting plate is maintained. Element mounts shall have

a blunted V-type knife edge for sealing to a flat gasket on the filter-coalescer or separator. The height of the V

section shall be 0.125 inch (3 mm) +10 percent. Torque requirements for installation of elements shall be provided

as specified (see 6.2). Element mounts shall be designed to withstand 150 percent of recommended assembly torque

without permanent distortion, cracking, or failure.

3.7 Maintainability.

3.7.1 Access. Components that require regular maintenance or servicing shall be readily accessible and not

require personnel to enter the filter-separator vessel. For very large filter-separator assemblies, this may be

unavoidable. If personnel entry is required, at least two equally spaced access openings shall be provided for safe

personnel access and temporary ventilation. Filter-separators with access covers heavier than 50 pounds shall have

an integral lifting device for removal.

3.7.2 Special tools. Special tools, if required for maintenance and servicing, shall be provided with the filter-

separator assembly.

3.7.3 Case drainage. The filter design shall permit the casing to be completely drained of all fluids before

servicing and maintenance.

3.8 Environmental requirements.

3.8.1 Shock. When first article inspection is required, the filter-separator assembly shall withstand Grade A

shock requirements of MIL-S-901, without any leakage (see 4.1.1).

3.8.2 Vibration. When first article inspection is required, the filter-separator assembly shall withstand vibration

in accordance with MIL-STD-167-1, Type I Environmentally Excited (see 4.1.1).

3.8.3 Temperature variation. The filter-separator assembly shall meet the temperature variation requirements

of API/IP 1581.

3.8.4 Materials. Filter-separator materials shall meet the environmental requirements of API/IP 1581 for fuel

types in this specification (see 3.6.2).

3.9 Identification plate. Identification plates shall be provided and comply with the requirements of

API/IP 1581. Identification plates shall be visible from the location where gages are normally viewed. The

permanent identification plate shall also include the following information: MIL-PRF-15618, revision, amendment,

and date.

4. VERIFICATION

4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:

First article inspection (see 4.1.1).

Conformance inspection (see 4.1.2).

4.1.1 First article inspection. When first article inspection is required (see 6.2), one complete filter-separator

assembly (see 3.1) shall undergo the tests and inspections outlined in Table I.

4.1.2 Conformance inspection. Each filter-separator assembly shall be inspected for conformance according to

the requirements specified in Table I.