Oil Tankers. Test 5

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

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

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?

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

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

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

The static suction head of a pump is the _____

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

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

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

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

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

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Oil Tankers. Test 5

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