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Question 1 of 5

30 minutes should be allowed before introducing any metallic ullage bob or the sampler into the tank after loading has ceased. This is to allow the charges to dissipate. This time is sometimes called the relaxation/relaxing time of the cargo. In case that the tank is equipped with a full depth sounding pipe this period is not required provided that the full depth sounding pipe is used.

Question 2 of 5

The 5 hours period can be reduced to 1 hour if the tank is continuously mechanically ventilated.

The 5 hours period can be reduced to 1 hour if the tank is continuously mechanically ventilated.

Question 3 of 5

The 30 minutes restriction only applies if a full depth sounding pipe is not fitted in the tank.

The 30 minutes restriction only applies if a full depth sounding pipe is not fitted in the tank.

Question 4 of 5

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Question 5 of 5

A corona discharge may be slowly released from sharp ends, however more dangerous discharges may still occur from such sharp ends.

In non-inerted cargo tanks, the metallic ullage bob or the sampler should not be introduced into the tank for a period of at least ... after the cargo loading has been stopped.

10 minutes.

Your answer
20 minutes.

Your answer
30 minutes.

Your answer
How long should you wait with introducing an unbonded metallic ullage bob or the sampler without a full length sounding pipe after the tank cleaning operation?

7 hours.

Your answer
5 hours.

Your answer
2 hours.

Your answer
Is this statement true or false? After stopping the loading, the sounding bob should not be lowered for 30 minutes, in a tank fitted with a full-depth sounding pipe.

False.

Your answer
True.

Your answer
Is the following statement true or false? Accumulated static charge inside the tank is not allowed to recombine or flow to the earth since it may lead to a static discharge of an electrostatic charge and can cause an explosion.

False.

Your answer
True.

Your answer
Is the following statement true or false? The separated charge inside the tank due to cargo turbulence tends to deposit on the sharp ends such as tank cleaning machine nozzles, high-level alarm probes.

True.

Your answer
False.

Your answer
Score:
Attempts:

10 minutes.

Your answer
20 minutes.

Your answer
30 minutes.

Your answer
7 hours.

Your answer
5 hours.

Your answer
2 hours.

Your answer
False.

Your answer
True.

Your answer
False.

Your answer
True.

Your answer
True.

Your answer
False.

Your answer
Score:
Attempts:

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