Oil Tankers. Test 9

A centrifugal bilge pump requires priming _____

in order to overcome the potential energy of water in the discharge line.
to initially unload the pump by having its head pressure equal to discharge pressure.
due to the inability of this type of pump to lift water to cover the suction (eye) of the impeller.
primarily to lubricate the shaft seals.

Before inert gas is introduced into a cargo tank, it should be established that the oxygen content of the gas is not more than _____

10% by volume
5% by volume
8% by volume
2% by volume

When discharging a double hulled tanker, the discharge plan must take into account the need to avoid _____

a discharge rate that is too slow.
a discharge rate that is too fast.
crude oil washing and discharging simultaneously.
excessive free surface.

Whilst discharging cargo, if the oxygen content within the inert gas main is above the SOLAS 1974 recommendations and the Engine Room inform you that they cannot reduce it, what would your actions be?

Stop all cargo operations.
Continue with cargo operations.
Call the chief engineer and continue with cargo operations.
Call the master and continue with cargo operations.

The purpose of pressure/vacuum valves is to _____

measure pressure/suction levels in cargo tanks
provide an audible alarm in the event of pressure build-up
provide for the flow of small volumes of tank atmospheres caused by variations in temperature
enable load/discharge of oil without opening sighting ports

Inert gas - how is sea water supplied to the deck seal?

Through a seawater aggregate pump fitted on the cargo deck
Through the deck seal pump fitted in the engine room
Through the deck fire line
Through the main seawater pumps or through the cargo condenser pump

Prior to starting the cargo pumps for discharge of a tanker cargo, it must be ensured that _____

the inert gas plant is ready for start-up.
all ballast tanks are inerted.
the pump room piping is inerted.
the inert gas plant is running on stand-by.

What is the purpose of the inert gas Scrubber Tower?

To remove sulphur combustion components from the gases.
To cool the flue gases and remove most of the sulphur and soot particles.
To remove soot particles and to saturate the gas with water.
To desuperheat the inert gases produced by the boiler by running the gases through water screens.

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Oil Tankers. Test 9

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