On disassembling a centrifugal pump for overhaul, the third engineer reports holes drilled axially in the back side of a single suction closed impeller. The reason for the these holes is which of the following?

Question

Accepted Answer

To reduce the axial thrust forces on the impeller

Answer

To allow for water to recirculate for impeller cooling

Answer

To reduce the power required for the pump

Answer

To fit a puller for removing the impeller

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