Topping up and Topping off

Difference between topping up and topping off 

Topping up is the procedure of filling inert gas in a cargo tank which contain inert gas before, ( increasing the pressure of inert gas) which is reduced to decrease in outside temp or any leakage from PV valve or mastriser.

Where as 

Topping off is the procedure of stopping the liquid cargo in a cargo tank at a desired level (same term is used for loading and/ or  if part discharging has to be done).

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