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5.29 RE-INSPECTION OF EMPTY TANKS
When a cargo tank has been emptied and drained it should be marked
as finished on the cargo status board and entered in the logbook. The
tendency is to assume that the tank is now as empty as possible and
that it will remain empty until the completion of the discharge. This
assumption may be wrong on two counts:
Additional cargo may accumulate near the stripping suction due to the
increased trim aft at the end of the discharge and
Cargo may re-enter the tank through bulkhead or pipeline leaks, or through
leaking or open valves.
When a cargo grade is finished, all of the tanks which held the same
grade of cargo should be examined to see if they contain pumpable accumulations.
Any tanks with pumpable accumulations should be restripped ashore before
the cargo grade is declared finished.
When the cargo operation is conducted from a CCR, the cargo watch officer
should note the final ullage of each tank as it is finished for the
first time and frequently check the readings of the empty tanks to verify
that the ullage has not decreased. Any empty tanks which show ullage
changes should be carefully inspected to determine the cause of the
change. If pumpable residues have accumulated, these should be stripped
ashore with a compatible grade of cargo.
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