API Spec 1581:2002 pdf download

API Spec 1581:2002 pdf download.SPECIFICATIONS AND QUALIFICATION PROCEDURES FOR AVIATION JET FUEL FILTER/SEPARATORS.
(b) The filter/separator shall be able to effectively remove water from fuel without exceeding the effluent free-water levels specified in Section 3.1.1 when water is added according to the procedures specified in Section 4.
2.3.3 Type S-LD filter/separators
Type S-LD filter/separators (also known as coalescer/ separators) can be used at all filtration points in an aviation fuelling system where significant levels of water but minimal amounts of dirt can be expected in the jet fuel. Examples of suitable locations could be immediately after a microfilter (used to remove dirt to acceptable levels) or at locations where acceptable dirt levels can be achieved without filtration. The qualification requirements fbr coalescer/separators are:
(a) The Type S-LD filter/separator shall be able to maintain rated flow when it is contaminated with particulate to the level specified in Section 4 without the contamination in the effluent fuel exceeding the level specified in Section 3.1.1.
(b) The Type S-LD filter/separator shall be able to
effectively remove water from fuel without
exceeding the effluent free-water levels specified in Section 3.1.1 when water is added according to the procedures specified in Section 4.
2.3.4 Multi-stage systems
2.3.4.1 Multi-stage systems can be used at all filtration points in an aviation fuelling system where two-stage filter/separators are used but where additional performance or assurance is desired. Multi-stage devices include pre-filters (upstream of filter/coalescers) and water absorbing elements (downstream of separators). Water absorbing elements can be used for additional assurance that effluent water will not exceed the level specified in Section 3.1.1. Examples of such locations could be systems where surfactants or additives might impair filter/separator performance or on fuellers and hydrant servicers where an additional precaution may be desired to keep water from aircraft.
2.3.4.2 The quail fication requirement for a multi-stage system is that the filter/separator shall be able to qualify under Section 2.3.2 or 2.3.3 when the multi-stage devices arc installed.
Note: This specification applies only to the filter/separator portion of the system. No specific level of performance by a multi-stage system is implied by this specification.
2.4 QUALIFICATION FOR OTHER
CATEGORY AND/OR TYPE SYSTEMS
2.4.1 Categories
2.4. 1. 1 Single—element testing
For single-element testing there is no automatic qualification between categories. Qualification for each category shall be established by testing.
2.4.1.2 Full-scale lest ing
(a) Filter/separators qualified by testing to Category M 100 also qualify for Category M at the test flow rate and conditions.
(b) Filter/separators qualified by testing to Category M also qualify for Category C at the test flow rate and conditions.
Note: Category M 100 testing does not qualify to Category C.
2.4.2 Filter/separators qualified as Type S
Filter/separators qualified as Type S by testing also qualify as Type S-LD at the tested flow rate and conditions.
3.1.1 Contanilnation of effluent fuel
Contaminants in effluent fuel samples. taken during the specified test procedure and analysed by the specified methods, shall not exceed the following limits:
(a) Total solids content of 0,26 milligrams per litre (1,0 milligrams per gallon) by ASTM D-2276.
(b) Free water content of 15 ppnw by ASTM D-3240.
(c) Media migration of 10 fibres per litre (38 fibres per gallon).
3.1.2 Media migration
Any particle in the effluent with a length-to-diameter ratio of’ 10:1 or more and a length of 100 microns or more shall be counted as a fibre.
3.1.3 Solids holding capacity
3.1.3.1 TypeS filter/separators, as tested in the single- element test, shall hold a quantity of solids greater than or equal to 1,43 grams per litre per minute (19 mg/l x 75 minutes) (5,4 grams per gpm) of rated flow. The unit shall hold 67 % of the specified quantity of solids without exceeding a differential pressure of 105 kPa (15 psi) and shall hold the total specified quantity of solids without exceeding a ditTerential pressure of 315 kPa (45 psi).