API IP Spec 1581-2002 pdf download

API IP Spec 1581-2002 pdf download

3.1.5 Structural strength of elements The filter/coalescer elements, coalescer elements, and the element sealing device shall be capable of withstanding a differential pressure of 520 kPa (75 psi) without rupture, by-passing of seals, or the emergence of pinhole leaks. 3.1.6 Structural integrity Filter/coalescer and coalescer elements shall meet single- element and full scale performance tests without showing indications of media or structural deterioration such as leaks or tears. Note that coalescer sock discoloration in the absence of supporting observation is insufficient to prove failure of structural integrity (see and 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 V essel design and construction 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. . 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. 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. 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. Cleanout/inspection connection Access shall be provided to permit inspection and cleanout 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. Where multi-stage systems are used, the outlet manifold shall be blanked off and tested to a minimum pressure of 795 kPa (115 psi gauge) or the required pressure specified for the qualified multi-stage element vessel, whichever is greater. Marking of inlets and outlets All inlet, outlet, and sump drain connections shall be permanently marked. 3.2.2. I3 Element spiders The free ends of all elements greater than 46 cm (18 inches) long, regardless of mounting assembly, shall be stabilized (supported firmly) to minimize vibration. One acceptable system uses an element spider to tie the elements together and stabilizes the spider to the vessel wall. A spider shall not be an unbonded charge collector: if the method of stabilization does not assure an electrically conductive bond between the spider and the vessel then the spider shall be separately bonded to the vessel. Element-locating devices shall be provided in the spider to support slightly misaligned elements securely without causing unnecessary strain. 3.2.2. 14 Access to elements Unless special installation conditions require otherwise, access to the elements shall be provided by a hinged or pivoted vessel cover. The use of swing bolts is recommended to facilitate quick access to the interior of the vessel. To permit access to the far end of the vessel for maintenance purposes, the vessel’ s length-to- diameter ratio shall be limited by the following expressions, unless otherwise specified by the purchaser:

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