Pumping Systems, Operations. Test 12 – Online Maritime Tests

How is the free flow of HFO in the bunker tanks maintained when the external temperature drops below it's pour point ?

By circulating it with the transfer pump.
By transferring it on time to the HFO settling tank.
By heating the oil with steam via steam coils or steam banks.
By always ensuring that warm oil is bunkered.

What are the two main items in this drawing ?

A hydraulic motor and a pump.
An electric motor and a screw pump.
A compressor and an electric motor.
A centrifugal pump and an electric motor.

If you find it difficult to obtain suction whilst pumping bilge well 'A' which of the following actions would you take ?

Check that strainer cover of well 'A' is not leaking.
Check that bilge well valves 'B','C' and 'D' are properly closed.
Prime the pump with sea water.
All of these.

The electric motor on one of your centrifugal pumps has for a period of time gradually been running at lower and lower Amp-load. The pump is still supplying water, but the pressure is reduced. Which of the below alternatives is probably the reason?

The pump has suction from many places at the same time.
The pump is running at lower speed due to short circuit in the electric motor.
The pump has been more effective because the suction strainer has been removed.
Inner diameter of impeller is bigger due to cavitations, or outer diameter reduced by erosion.

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