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Oil Tanker Competence

Tank Cleaning – Principles & Operations

A test covering the fundamentals of cargo tank cleaning using tank cleaning machines. It includes cleaning principles, temperature regimes, pressure, the use of cleaning chemicals, cleanliness standards, and basic safety requirements. Suitable for cadets and junior officers.

Питань 18
Час 9 min
Мова Англійська

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Питання 1

Is it allowed to recirculate the tank cleaning water after carrying a cargo of petroleum?

A Yes – if the tanks are inerted, it is allowed to recirculate the tank cleaning water.
B No – recirculation the tank cleaning water will increase the risk of an electrostatic discharge, therefore it is not allowed under any circumstances.
C No – recirculation will prevent the tank from becoming clean.
D Yes – it is always allowed to recirculate the tank cleaning water.

Питання 2

What will happen with the flammable range if the oxygen content is lowered?

A The range will become more narrow.
B Nothing will happen.
C The flammable range is not oxygen dependent.
D The range will become wider.

Питання 3

What is the flashpoint?

A The lowest temperature where a liquid will vapourize to form an ignitable mixture in air.
B The minimum energy required to ignite an explosive mixture.
C The minimum gas percentage required for a gas/air mixture to ignite.
D The temperature at which a substance will spontaneously ignite without an external heat source.

Питання 4

The viscosity of a liquid depends on the:

A Temperature of the liquid.
B Acid value of the liquid.
C Flash point of the liquid.
D Vapour pressure of the liquid.

Питання 5

What is White Water Standard?

A A cleanliness Standard where the tanks are cleaned so they are visually clean, dry and odour free.
B A cleaning chemical especially for Stainless Steel Tanks.
C A tank cleaning method used to clean tanks in order to carry drinking water.
D Sea Water treated with chemicals to remove chlorides.
Tank Cleaning – Principles & Operations

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