Marina Exam Reviewer: In what kind of atmosphere should tank washing be carried out when no inert gas plant is in operation?

Marina Exam Reviewer

In what kind of atmosphere should tank washing be carried out when no inert gas plant is in operation? 

A. Too lean ( less than 2% by volume of hydrocarbons) or over rich ( in excess of 15% by volume of hydrocarbons ) 
B. After having send a man down in the tank to check that there is no more oil left 
C. Ventilate the tank up to 21% oxygen 
D. After having aired the tank for at least 24 hours 




Answer:      A. Too lean ( less than 2% by volume of hydrocarbons) or over rich ( in excess of 15% by volume of hydrocarbons ) 

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