Oil Tankers. Test 16 – Online Maritime Tests

What is the purpose of the decanting line between two sloptanks when you are waterwashing a cargo tank?

Make it possible to avoid build-up of static electricity during waterwashing
Enable both the primary and secondary sloptank to be filled without using the main cargo lines
Make it possible to retain most of the recovered oil in the primary sloptank, while cleaner part of the water will flow into the secondary sloptank, where it can be re-used as wash-water
Make it possible to fill the secondary sloptank, if the primary sloptank fills up

Operation of eductor- what is correct?

What is the purpose of a 'part flow display system' installed on some oil tankers ?

The Part Flow System makes it possible to measure the oil content, even if the Oil Discharge Monitoring Equipment is not working
The Part Flow System makes it possible to discharge dirty ballast below the water line on older tankers
The Part Flow System makes it possible to observe the discharge visually for oil content, on older tankers with discharge below the waterline
The Part Flow System makes it possible to observe the discharge visually for oil content, even in darkness

Why is the inlet to the sloptank often directed towards the bulkhead (see the illustration) ?

Bulwarks are generally not permitted in the cargo tanks areas because:

Are all pumps and blowers shut down during the shut-down procedure?

The use of steam driven ejectors for ventilation of cargo tanks having flammable vapours in them is not recommended now-a-days due to:

Steam at high velocities may generate static electricity which might cause incentive sparks?
It being not a very effective system for tank ventilation?
It might cause burns to unwary personnel?
It is rather expensive to waste steam?

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