Answer Posted / m.saravanaraj

A clearance between the pump casing and impeller is
required for free rotation of the impeller,if the clarance
is more between them,there is some possibility of water
leakage from the high discharge to suction side which
ultimately reduce the efficiency of the pump performance
and the leakage water will cause corrosion.In order to
avoid these problem a wear ring is incorporated in the pump.
In total the purpose of wear ring is to prolong the
life of the pump casing and impeller

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