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.

Questions 18

Time Limit 9 min

Language English

Sample Questions

Here are some example questions from this quiz. Download the GYRO app to take the full test.

Question 1

What is the most common reason for performing crude oil wash?

A To prevent cargo sludge building up.

B To avoid contamination of the next cargo.

C To comply with the Volatile Organic Compound Management Plan.

D To make it easier to ventilate the tank.

Question 2

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.

Question 3

When oil is flowing through a steel pipe both will be electrostatically charged in such a way that:

A One will be negatively charged, the other will be positively charged.

B Both will be negatively charged.

C Both will be positively charged.

D None of them will be charged.

Question 4

What will be the normal pressure when cleaning with dual nozzle tank cleaning machines?

A 8-10 bar.

B 4-6 bar.

C 6-8 bar.

D 10-12 bar.

Question 5

The fire hazard is controlled by «removing» the oxygen side in the fire-triangle when cleaning an inerted tank. How do we control the fire hazard if the tank is not inerted?

A By «removing» both the fuel and the sources of ignition.

B By «removing» both the fuel, oxygen, and the sources of ignition.

C By «removing» the fuel.

D By «removing» the sources of ignition.

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