API IP Spec 1581:2002 pdf download.SPECIFICATIONS AND QUALIFICATION PROCEDURES FOR AVIATION JET FUEL FILTER/SEPARATORS
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 construction 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.Vessels may be fabricated from uncoated aluminium upon agreement of purchaser and manufacturer. 3.2.2.2.2 The sensing lines in new installations shall be stainless steel. 3.2.2.3 Vent and pressure relief taps Each filter/separator shall be provided with a tap for a pressure relief valve to relieve pressure from thermal expansion of the fuel. A connection for an air eliminator shall be provided at the highest point in the vessel. 3.2.2.4 Sample taps Sample taps shall be provided to permit the taking of influent and effluent fuel samples during fuel flow. 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.
API IP Spec 1581:2002 pdf download
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