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purpose of centrifugal pump casing wear ring and impeller
wear ring
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Answer Posted / gautam
there is a small clearence maintained between impeller nd the casing, so that impeller can rotate freely.Now there is a small amount of liquid leaking from discharge side to suction side causing erosion of the parts near clearence,causing this clearence to increase. so casing wear rings are provided to minimize these clearence nd take up the erosive action of leakage fluid on itself rather than letting the impeller or casing to be eroded. Now as casing wear rings are cheap they can b replaced by new one if it has worn out enough.
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