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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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