Oil Tankers. Test 5

Which of these statements is correct concerning the starting of centrifugal pumps?

A priming pump is always required to flood the impeller suction.
They should always be started with the discharge valve closed.
They should always be started with the sealing line valves closed.
They should always be started with the discharge valve opened.

If a bonding cable is not connected by the terminal when joining a manifold for cargo operations _____

you should use an oxygen analyzer at all times
you should not commence cargo operations
you should use an International Shore connection
you should insert an insulating flange or single length of non-conducting hose

The static suction head of a pump is the _____

distance the suction liquid level is below the center line of the pump.
amount in inches of mercury the total suction head is below atmospheric pressure.
force necessary to overcome frictional losses in the pump and piping.
distance of the suction liquid level above the center line of the pump.

The simplest method to use for determining if a centrifugal pump is operating as designed is to _____

closely observe the pump discharge temperature.
use a clamp-on ammeter and compare the readings with past records.
momentarily close off the suction valve, and watch for a rise in pressure.
close off the discharge valve, and watch for a rise in pressure.

In spaces declared gas-free, further gas may be released _____

after loose scale and sludge are disturbed
when the temperature of the sea water rises
when water is loaded into the cargo tank
when oxygen levels become reduced

On tankers using hydraulic tank valve actuation, which of these valve types has the highest tendency to develop leaks relative to the valve, requiring more frequent maintenance?

Check valves.
Butterfly valves.
Globe valves.
Gate valves.

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Oil Tankers. Test 5

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