In the filter separator is equipped with two different sets of different functions of the filter, coalescence filter and separation filter when the fuel flows through the filter separator, in its internal filtration, coalescence, sedimentation, separation of the four processes.
Jet fuel from the inlet into the filter first-level tray, and then dispersed into the first-stage coalescence filter, jet fuel from the inside out, first through the filter layer to remove solid impurities, and then through the coalescence layer, Large water droplets, sink in the bottom of the filter, to achieve water separation; oil flow from the outside into the secondary separation filter, the future and the subsidence of the water droplets by the separation of the role of the role of clear water in the jet fuel completely separated, settling in the sump, Drain valve discharge; clean jet fuel through the separation filter pool in the secondary tray. The purified jet fuel is fed from the filter outlet to the aircraft refueling system.
In accordance with the civil airport and military airport regulations: the use of oil depots to the aircraft wing under the fuel filler joints, the general use of three jet fuel filter separator device.
Natural gas first into the feed gas chamber, the gas first hit in the support of the filter support tube (to avoid direct impact of the air filter filter, resulting in early damage to the filter), the larger solid-liquid particles were initially separated, and under the action of gravity Sink to the bottom of the container (periodically discharged from the drain).
Then the gas is filtered from the outside to the filter through the filter, the solid particles are trapped by the filter medium, the liquid particles due to the filter media coalescence function in the inner surface of the filter gradually coalescence grow up. When the droplets reach a certain size will be due to the impact of air from the inner surface of the fall into the filter into the internal flow channel and then into the convergence chamber. In the convergence of the material chamber, the larger liquid beads rely on gravity settlement separation, in addition, in the convergence of the material chamber, also has a separation element, it can effectively capture the droplets to prevent the export of droplets are entrained, To further improve the separation effect, the last clean gas out of the filter separator.
With the increase in gas throughput, the particles deposited on the filter will cause an increase in the pressure difference of the filter. When the pressure difference rises to the specified value (read from the differential pressure meter), the filter element has been seriously blocked and should be replaced in time The Filter separator replacement pressure is not higher than 0.1Mpa
Jet fuel from the refinery to the aircraft refueling in all aspects of the concentration of pollutants are different. In order to be able to economically and effectively use the filter, API1581 standard from the third edition of the filter will be divided into A, B, C three, to adapt to different needs.
A: water, impurity content of the highest, serious pollution of the occasion, such as refinery semi-into the library, finished product library out of the library lines, storage depots and other storage pipeline.
B: moisture, impurity pollution content is higher, moderate pollution occasions, such as storage depot, transit depot, the use of oil depot out of the pipeline.
C: suitable for moisture, impurity pollution is very low, mild pollution of the occasion, such as direct to the aircraft refueling tanker trucks, pipeline fuel trucks and fuel tanks and so on.
A, B, C three filters after the oil quality standards are the same, but its dehydration capacity and capacity of pollutants are different. Performance level A> B level> C level, regardless of the cost of the case, A can replace the B level, B can replace the C level. In order to give full play to the role of the filter to extend the life of the filter coalescence filter, should be used with the pre-filter.
"Aeronautical jet fuel filter separator technical specifications and quality of qualified identification method" to cancel the jet fuel filter separator performance level of the three levels. Field survey data analysis shows that jet fuel in the entire transport process, with the same degree of particle pollution. Therefore, all the locations in the transport system require the same effective filtering, but the filter system layout or the continuation of the third edition of the idea.
"Aeronautical Jet Fuel Filter Separator Technical Specification and Quality Qualification Method" The filter separators were re-classified into three categories, M100 for JP-8 + 100 filtration, M for JP-8 / JP-5 Filtration Class and class C of JetA / A1 filtering. So that civil and military filtration requirements of the technical specifications together.