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API Spec 1590-2002 pdf free download

3.1 ELEMENT PERFORMANCE SPECIFICATIONS In this Section, the minimum performance level of the microfilter element is specified. Note: Elements are normally qualified for use in vertically orientated vessels but may additionally be qualified for horizontal use by repeating Run 2 of the performance tests (described in Section 5) in the horizontal orientation. 3.1.1 Contaminant removal efficiency The effluent fuel downstream of the microfilter element shall contain less than 0,15 mg/l particles greater in size than the stated filter rating. Solids transmissions shall be measured by the use of membranes according to the specific element rating as follows: 1,0 µm element 0,8 µm membranes 2,0 µm element 2,0 µm membranes 3,0 µm element 3,0 µm membranes 5,0 µm element 5,0 µm membranes (For further details on the verification of filter rating see 5.4.2 and Annex D.) The specified removal efficiency shall be maintained up to a differential pressure of 150 kPa (22 psi). 3.1.2 Media migration The effluent fuel downstream of the microfilter element shall contain less than 10 fibres per litre. A fibre is defined as any particle with a maximum dimension ten times greater than the minimum dimension and where the maximum dimension is greater than 100 µm. 3.1.3 Flow rate Elements with a nominal 150 mm (nominal 6 in.) outside diameter shall meet the performance specification at a minimum flow rate of 10 l/sec/m of effective media length (equivalent to 6 l/min/cm or approximately 4 US Gal./min/in). Manufacturers may qualify elements at higher flow rates if they wish. Note: This flow rate is specified for qualification purposes only. Since element life in a given application is a function of both dirt loading and flow rate, it is recommended that the purchaser consult with the microfilter supplier to establish the optimum flow rate/vessel size for that application. For elements with outside diameters different to that specified above it is not possible to prescribe a minimum qualification flow rate. Manufacturers offering such equipment are advised to qualify at a flow rate maximised for the level of influent dirt indicated in 5.4. 3.1.4 Differential pressure The manufacturer shall state the average differential pressure across a new element operating at the qualification flow rate with clean, dry fuel in technical literature intended to communicate differential pressure based change out requirements.
3.1.5 Fluid compatibility of elements The requirements of this publication for compatibility testing (Run 5) are: (a) The difference in existent gum between the blank run and element run shall be no greater than 8 mg/100 cm 3 . If the difference between the initial blank and the blank after the second 336 hour soak period is greater than 8 mg/100 cm 3 then the whole compatibility test run shall be repeated. (b) The water interface rating shall be no greater than 1b. (c) Any colour decrease shall be no greater than 4 Saybolt colour units compared with the blank measured after the total soak time period. (d) There shall be no visual change in the test element. 3.1.6 Structural strength of elements The filter element shall be capable of withstanding a differential pressure of 500 kPa (72,5 psi) (Element structural test, 5.4.6) without element rupture, collapse or bypassing of seals. 3.1.7 Structural integrity Filter elements shall meet Run 1-5 performance tests without showing indications of media or structural deterioration as evaluated by the critical examinations specified in Section 5. 3.2 MECHANICAL SPECIFICATION 3.2.1 General Final acceptance of the microfilter element depends upon its satisfactory functioning during the performance tests described in later sections. New microfilter vessels shall meet the mechanical requirements contained in 3.2.3 and 3.2.4. Where the purchaser specifies low temperature operability, the manufacturer shall guarantee elements for operation within the temperature range !50 EC to +70 EC (!65 EF to +160 EF). Element packaging Elements shall be packaged for shipment so that mechanical damage and contamination by dirt and water are prevented. The packaging shall include element installation instructions including, as a minimum, the recommended element fixing torque and, as necessary, information on fasteners for mounting adapters, end cap nut sizes, etc.

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