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Deep-Bed  Filters
Backwashing

Mechanical Science Volume 2 of 2
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Miscellaneous Mechanical Components DOE-HDBK-1018/2-93 FILTERS AND STRAINERS Deep-bed filters, like precoat filters, are cleaned by backwashing.  Water is pumped through the distribution piping near the top of the filter.   The flow rate of the water is kept high enough to lift  the  granulated  charcoal  or  anthracite  up  into  the  free  space.    The  water  washes  away  the deposits that have accumulated.  When the backwash cycle is completed, the flow is stopped, and the granules settle back down into the filter bed.   The filter can then be put back into service. Metal-Edged  Filters Metal-edged filters are used in the lubrication (oil) systems of many auxiliary units.   A metal- edged filter consists of a series of metal plates or disks.   Turning a handle moves the plates or disks across each other in a manner that removes any particles that have collected on the metal surfaces.    Some  metal-edged  type  filters  have  magnets  to  aid  in  removing  fine  particles  of magnetic materials. Strainers Strainers  are  fitted  in  many  piping  lines  to  prevent  the  passage  of  grit,  scale,  dirt,  and  other foreign matter, which could obstruct pump suction valves, throttle valves, or other machinery parts.   One of the simplest and most common types of strainers found in piping systems is the Y-strainer, which is illustrated in Figure 23. Figure 23   Y-strainer Figure 24 illustrates three additional common types of strainers.   Part A shows a typical sump pump suction bucket strainer located in the sump pump suction line between the suction manifold and the pump.   Any debris that enters the piping is collected in the strainer basket.   The basket can be removed for cleaning by loosening the strongback screws, removing the cover, and lifting the basket out by its handle. Part B of Figure 24 shows a duplex oil strainer commonly used in fuel oil and lubricating oil lines, where it is essential to maintain an uninterrupted flow of oil.   The flow may be diverted from one basket to the other, while one is being cleaned. Rev. 0 ME-05 Page 45







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