API IP Spec 1596-2006 pdf free download
API IP Spec 1596-2006 pdf free download.DESIGN AND CONSTRUCTION OF AVIATION FUEL FILTER VESSELS . .
2.5.2 Metallurgy All metal parts in contact with the fuel shall be free of vanadium, zinc, cadmium, copper and their alloys. Vessels may be constructed of stainless steel, aluminium or carbon steel. Carbon steel vessels shall be internally coated with a light- coloured epoxy coating approved by the purchaser. Sensing lines shall be stainless steel 2.5.3 Gaskets, seals and coatings All gaskets, seals and coatings shall: Not deteriorate when exposed to fresh or salt water. Not promote microbiological growth. Be compatible with all aviation fuels and approved aviation fuel additives. Meet relevant industry and/or military specifications. Have appropriate pressure ratings. Note: Pure cork gaskets and compounds containing asbestos are not acceptable. 2.6 PIPING CONNECTIONS All main fuel piping conections larger than 38 mm (1,5 in.) nominal bore shall have a pressure rating equal to or greater than that of the vessel and should be flanged. Connection types other than flanged may be used if specifically requested by the purchaser. Note: Fire safety is sues should be considered when specifying comnections. To avoid clement damage, the vessel shall be designed so that high velocity inlet flow does not impinge flter clements. This can be accomplished by locating the inlet connection at an element-fice region of the vesel or shielding the elements with a baffle.
2.7 PORTS AND CONNECTIONS Ports shall be female threaded or flanged according to purchaser request. N ote: Male threaded stubs welded to the vessel are not acceptable for attachment of small valves and ftings since the threads are more susceptibleto damage during shipping and handling. Ports which have parallel threads shall have smooth external faces and dimensions suitable for fttings with an integral O -ring face seal and those utilising bonded sealing washers e.g. Dowty and Stat-O -Seal types. Weld beads on vertically intalled halfcouplingsor pipe stubs should not protrude intemally to cause localised entrapment of contamination. 2.8 VENT AND PRESSURE RELIEF PORTS A connection shall be provided at the highest fuellevel in the vessel of the inlet and/or outlet chamber, as appropriate, for installation of an air eliminator. Provision for a pressure relief valve shall also be made. 2.9 PRESSURE PORTS Ports shall be provided for connecting appropriate pressure gauges to the filter vessel to read differential pressure between the inlet and outlet piping connections. Provision shall be made for measuring the differential pressure across the stages for multi-stage vessels.
Water shall drain freely from the entire vessel and sump. A sump having a flat, level base does not meet this requirement. Vessel designs (ic. lid sealing schemes) that create void spaces that can trap water do not meet this requirement. All chambers, inclhuding the inlet and outlet branches, must be provided with ports so that fuel andor any accumul ated contamination can be completely removed via low-point drains. To facilitate this, sur faces shall avoid localised low points or stagnant areas. The main chamber containing the elements shall incorporate a definite slope toward a low point. For flat plates the minimum slope shall be three degrees. V ertical monitor vessels utilising 50mm(2 in.) elements are exempt from this requirement as are horizontal vessels on mobile equipment. Where manifolds are used in vertical vessels, the lower dished (concave) end of the vessel shall be acceptable without modification. Intemal weld beads on half couplings or pipe stubs shall not protrude to cause localised trapping of contamination. The height between any vessel drain/sample port and the ground shall be a minimum of 600 mm (24 in), unless otherwise agreed by the purchaser. This allows for installation of valves, ftings and extension lines whilst leaving enough clearance for the use of a bucket.
