Filters and Strainers Summary (Cont.)

Mechanical Science Volume 2 of 2
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FILTERS AND STRAINERS DOE-HDBK-1018/2-93 Miscellaneous Mechanical Components Filters and Strainers Summary (Cont.) A duplex strainer is a strainer consisting of two sides with a basket in each side. Only one side is placed in service at a time. These are 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. If the filter or strainer cannot be easily removed for cleaning, the system design will usually include a flowpath for backwashing. The intent of a backwash is to flow liquid in the opposite direction of normal flow, creating a pressure that pushes the debris off the strainer or filter. The debris is flushed to a waste tank or drain. Normally, to establish a backwash lineup, the flowpath upstream of the inlet to the strainer or filter is closed, the flow path down stream of the outlet is closed, and a drain flowpath is opened. The flush source is then opened and the flow goes into the outlet of the strainer or filter, through the strainer or filter, and exits the inlet to the backwash drain or waste tank, carrying the debris with it. end of text. CONCLUDING MATERIAL Review activities: Preparing activity: DOE - ANL-W, BNL, EG&G Idaho, DOE - NE-73 EG&G Mound, EG&G Rocky Flats, Project Number 6910-0024 LLNL, LANL, MMES, ORAU, REECo, WHC, WINCO, WEMCO, and WSRC. ME-05 Rev. 0 Page 48

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