Oil Tankers. Test 9

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

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

The purpose of pressure/vacuum valves is to _____

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

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

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

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

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

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.
all ballast tanks are inerted.
the pump room piping is inerted.

A centrifugal bilge pump requires priming _____

primarily to lubricate the shaft seals.
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.
in order to overcome the potential energy of water in the discharge line.

What is the purpose of the inert gas Scrubber Tower?

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

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Oil Tankers. Test 9

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