Pumping Systems, Operations. Test 5

If a serious cavitation problem is experienced effecting the pump casing and impeller badly, the shape and design of which pump part could be altered and why?

The shape of the impeller to decrease capacity.
The shape of the outlet pipe to dampen turbulence.
The shape of the mouth ring to extend it and avoid turbulence.
The shape of the inlet piping to smooth the flow into the impeller.

According to regulations, on board ships it is necessary to have PUMP REDUNDANCY. What does this mean?

A stand-by pump must be available for each pump separately.
All pumps in the engine room are duplicated.
Two identical pumps must be fitted for each circuit.
All essential pumps in the engine room have a back-up possibility.

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Pumping Systems, Operations. Test 5

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