Oil Tankers. Test 9

The purpose of pressure/vacuum valves is to _____

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

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

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

What is the purpose of the inert gas Scrubber Tower?

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.
To remove sulphur combustion components from the gases.

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

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

A centrifugal bilge pump requires priming _____

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

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

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

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

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

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?

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

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Oil Tankers. Test 9

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