MIL-PRF-83041C
AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)
Sections VIII & IX, D1B
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Boiler and Pressure Vessel Code, Rules for Construction of
Unfired Pressure Vessels (DoD adopted)
(Application for copies should be addressed to the American Society of Mechanical Engineers, 345 E.
47th St., New York, NY 10017, phone 212/705-8500 or FAX 212/705-7739.)
2.4 Order of precedence. In the event of a conflict between the text of this document and the references
cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes
applicable laws and regulations unless a specific exemption has been obtained.
3. PERFORMANCE REQUIREMENTS
3.1 First Article. When specified (see 6.2.4) a sample shall be subject to first article inspection in
accordance with 4.2.
3.2 Ease of use. The filter separator shall be designed to insure ease and rapid installation of
equipment, ease of use, and ease of general maintenance and repair.
3.3 Performance requirements. The filter separator shall be capable of meeting the performance
requirements outlined in the 3rd Edition of American Petroleum Institute's Bulletin 1581, "Specification
and Qualification Procedures for Aviation Jet Fuel Filter Separators", for Group II, Class B equipment
at a design flow rate of 600 gpm (±10 gpm).
3.3.1 Filter separator. The filter separator shall be designed and constructed so that parts will not work
loose and capable of withstanding the stresses, jars, vibrations and other conditions incidental to
shipping, storage, and service. All components shall be easily removed, serviced and operated. Any
design which renders operation of the filter separator as unduly difficult under field conditions will not
be acceptable. The filter separator, coalescers, and separator screens shall be identified with the
manufacturer's part number.
3.3.2 Components. To meet user safety and maintenance requirements, the filter separator shall consist
of the following major components: vessel, vessel cover, base or skid frame, coalescer and separators
elements, flow control valve, float control assembly, tie downs, fittings, connections and miscellaneous
openings, spider assembly, differential pressure gauge, and ground rod.
3.3.2.1 Materials. All components and materials (to include gaskets, fittings, valves, adhesives, etc.)
that normally come into contact with the fuel during operation shall be proven fuel resistant materials
and shall not degrade or be affected by fuel.
3.3.3 Accessories. The filter separator accessories shall consist of a direct read, piston-type differential
gauge that is capable of measuring differential pressure across both coalescers and separators and have
an automatic air eliminator with a check valve feature. It shall be designed to vent the vessel for
element change and include an adjustable pressure relief valve, a manual ball valve for draining the
vessel, and a flow control/water slug valve.
3.3.4 Flow. The maximum flow through the filter separator shall be limited to 600 gpm.
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