API IP Spec 1581 pdf download.SPECIFICATIONS AND QUALIFICATION PROCEDURES FOR AVIATION JET FUEL FILTER/SEPARATORS
2.1.1 Filter/separator A filter/separator is a vessel containing filter/coalescer and separator elements that continuously removes dirt and water from aviation jet fuel to levels acceptable for servicing modern aircraft. A filter/separator can have either a vertical or a horizontal configuration. A filter/separator can consist of multiple stages. 22.214.171.124 A two-stage system consists of filter/coalescer and separator elements contained within a vessel. The fuel flows through the filter/coalescer element(s) into the vessel and then flows through the separator element(s) to exit the vessel. 126.96.36.199 A multi-stage system consists of a two-stage system that contains one or more additional stages. Additional stages may include currently qualified devices 6 located within each separator element capable of shutting off fuel flow if the filter/coalescer and separator elements fail to remove water to an acceptable level. Additional stages may also include currently qualified devices 6 located within each coalescer element designed to remove dirt (prefilter) or contaminants (adsorption stage). 2.1.2 Filter/coalescer A filter/coalescer is an element that is capable of removing dirt and of coalescing fine droplets of water in the fuel to sizes that can be removed in the filter/separator vessel. Filter/coalescers are classified as Type S and Type S-LD (low dirt) according to the amount of dirt the elements are capable of removing as defined in Section 2.3. 2.1.3 Separator A separator is an element that prevents water droplets (coalesced by the filter/coalescer) from leaving the vessel in the effluent stream. 2.1.4 Filter/separators For the purpose of this specification, filter/separators are qualified for one or more of the three categories defined in Section 2.2.
2.1.5 Abbreviations The following abbreviations and terms are used within: cm: centimetre gallon: U.S. gallon gpm: U.S. gallons per minute kPa: kilopascals (1 kPa = 0,144 psi) l: litre lpm: litre per minute mg: milligram mg/l: milligram per litre ml: millilitre mm: millimetre pinhole leak: A structural failure less than 1 mm in size. Discoloration on the sock of a filter/coalescer may indicate the presence of a pinhole leak but further investigation is necessary to ascertain ppmv: parts per million by volume psi: pounds per square inch (1 psi = 6,95 kPa) pS/m: picosiemens per metre (1 pS/m = 10 -12 siemens/metre. 1 siemens = 1 mho = 1 ohm -1 = 1 ampere per volt) rated flow: Rated Flow is the flow rate used for testing the performance of a filter/separator system in accordance with this specification. Note that the rated flow of a filter/separator system (meeting all specification requirements) is the maximum flow rate for that system in field applications rpm: revolutions per minute s/s: start/stop 2.2 CATEGORIES 2.2.1 Category C 188.8.131.52 Category C filter/separators (for commercial aviation fuel) are tested with a fuel containing an additive package in accordance with the procedures described in Section 4. 184.108.40.206 Category C filter/separators, coalescer/ separators and multi-stage systems are suitable for use with aviation turbine fuels that might contain surfactants but do not contain dispersant additives used in some military applications to enhance the thermal stability performance of jet fuel.2.2.2 Category M100 220.127.116.11 Category M100 filter/separators (for thermal stability enhanced military aviation turbine fuels) are tested with fuel containing an additive package that includes a dispersant, used to enhance thermal stability, in accordance with the procedures described in Section 4. 18.104.22.168 Category M100 filter/separators, coalescer/ separators and multi-stage systems are suitable for use primarily with military aviation turbine fuels that include dispersant additives such as those used to enhance thermal stability. 2.2.3 Category M 22.214.171.124 Category M filter/separators (for military aviation turbine fuels) are tested with fuel containing an additive package used in military fuels in accordance with the procedures described in Section 4. 126.96.36.199 Category M filter/separators, coalescer/ separators and multi-stage systems are suitable for use primarily with military aviation turbine fuels that contain static dissipater additive, metal deactivator additive, anti-oxidant, corrosion inhibitor, and anti- icing additive.