Oil Tankers. Test 2

On tankers, the crude oil washing check list states (amongst other things) that during crude oil washing operations _____

the quality of the inert gas must be frequently checked and recorded.
the inert gas oxygen content must be below 4.5 % in order to start or continue washing.
the inert gas system should be in operation.
the inert gas pressure is to be recorded prior to starting washing.

Clean ballast is normally _____

ballast water loaded into cargo tanks which have been crude oil washed.
ballast water loaded directly into a cargo tank after discharge.
ballast water loaded in tanks used only for that purpose.
ballast water loaded into cargo tanks which have been crude oil and water washed.

In the vicinity of an electrical storm tank cleaning _____

may continue if the tank pressure remains at atmospheric.
must be stopped.
may continue providing the tanks are inerted.
may continue providing the tank venting system is isolated.

Steam heating coils are provided in some cargo tanks in order to _____

provide warm water when tank cleaning
heat cargoes which have a high pour point
increase the volume of the cargo within the tank
reduce the volume of the cargo within the tank

Clean ballast may be discharged _____

by pumping only through a discharge line which is connected to an operational oil content monitor.
only by gravity.
by pumping directly through any overboard discharge line.
by pumping through the bottom sea chest.

One of the requirements for crude oil washing on tankers is that an inert gas system be fitted. According to regulations an inert gas system is required for which spaces?

Every cargo tank.
Every cargo tank, slop tank, cofferdam and ramp space.
Every cargo tank and slop tank.
Every cargo tank, slop tank and cofferdam.

Compared to globe and angle valves, gate valves _____

cannot be used for service requiring infrequent operation.
are more suitable for throttling.
are more easily repaired.
operate with little or no pressure drop when fully opened.

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Oil Tankers. Test 2

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