API IP Spec 1581:2002 pdf download.SPECIFICATIONS AND QUALIFICATION PROCEDURES FOR AVIATION JET FUEL FILTER/SEPARATORS.
3.1.6 Structural inlegrity
Filter,coalescer and coalescer elements shall meet single-element and full-scale perfonnance tests without showing indications of media or structural dctcrioration such as leaks or tears. Note that coalcsccr sock discoloration in the absence of supporting observation is insufficient to prove failure ofstructural integrity (see 4.3.2.8 and 4.4.5.5).
3.2 MECHANICAL SPECIFICATIONS
3.2.1 General
The acceptability of a design ultimately depends on satisfactory functioning of the vessel and components during the performance tests described in Section 4.
3.2.2 Vessel design and construction
3.2.2.1 Design codes
Filter/separator vessels shall be designed and constructed in accordance with the most recent edition and revision of Section VIII of the ASME Boiler and pressure vessel code or with equivalent codes applicable in the region of intended use.
3.2.2.2 Materials of con.slnwlion
3.2.2.2.1 All metal parts that contact fuel, with the exception of sensing lines, shall contain no zinc. copper, or cadmium or their alloys. Vessels shall be of stainless steel, anodized aluminium, carbon steel, or aluminium chemically converted in accordance with the most recent edition and revision of MIL-C-5541. Carbon steel vessels shall be internally coated with a white or light-coloured surface coating which shall not deteriorate upon exposure to fresh or salt water or aviation fuels, nor shall the coating affect fuel quality. Epoxy coatings conforming to the most recent edition and revision of MIL-PRF-4556 or an equivalent specification and other purchaser-approved coatings that have demonstrated equivalent or superior performance (to these epoxy coatings) are suitable.
Sample taps shall be provided to permit the taking of miluent and effluent fuel samples during fuel tiow. Each sample tap shall be large enough to accept. at least, a 1/4-inch National Pipe Thread probe assembly or an assembly of similar size, as applicable in the region of intended use.
3.2.2.5 Pressure taps
Pressure taps shall be provided to connect the appropriate pressure gauges or sensors to the filter/separator. The gauges or sensors shall permit reading the inlet pressure to the vessel and the outlet or total differential pressure. For multi-stage systems. pressure taps to measure the pressure drops across the filter/coalescer and across the separator and additional stage(s) shall be provided.
3.2.2.6 (‘leanowinspection connection
Access shall be provided to penni inspection and clcanout of all inaccessible chambers of the vessel, such as sumps and locations under or behind deck plates and manifolds. Acceptable provision for access shall be provided by the use of a 10 cm (4 inch) flanged cleanout connection when permitted by the design and construction code or an alternate scheme providing equivalent accessibility. Access schemes requiring the removal of the vessel’s inlet or outlet piping are unacceptable. Access schemes should be engineered to minimize the volume of deadlegs.
3.2.2.7 Drain and sample con nections
Water drains, sample drains, or both shall be provided at the low points of the inlet and outlet compartments and of the deck plate. Welded half-couplings 19 mm (0,75 inch) in diameter, furnished with pipe plugs, will satisfy this requirement. To ensure positive drainage. drains shall run from the bottom of the sump collection area.
API IP Spec 1581:2002 pdf download
