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Normally, differential pressure of feed filters is considered. At high differential pressure > 1.0 Kg/cm2, the feed filters are switched to clean one (Manual) or back washing sequence starts in case of Auto back wash system.
High differential pressure or low pressure at downstream of filters will cause flow restriction, passing of particles through feed filters. In extreme case, feed filter cartridge may be damaged at > 2.5 Kg/cm2 differential pressure and passing through of particles to hydrotreating reactor.
Therefore, it is critical to monitor and control the differential pressure of feed filters for reliable operation of the reactor.