Proper speed of the pump doesn't allow slops to build up , otherwise rewashed resulting in lost of time, that's why throughout the cleaning process , Expertise always kept cargo pump
( suitable with proper speed ) in runing condition.

 BENEFIT OF BALANCED CARGO PUMP SPEED :

The flow of water through the pump acts as a cooling for the seals. 
If the pump runs dry for a while the seals might get damaged from overheating. 
The same happens if the pump speed is too high compared to the actual demand by the water flow in the tank, the result will be damaged seals, lost time and extra work for all.

PRECAUTION : Always maintain the pump manufacturing operating instruction :

During the stripping sequence, if the liquid is being thrown from the cargo pump above the impeller, it is a good indication that the wear ring needs to be replaced. 
This significantly reduces the output of the pump and will also affect cleaning in lower parts of the tank adjacent to the pump. 
The cargo pump cofferdam must be purged before and after cleaning to avoid blockage, which may lead to serious cargo or hydraulic system contamination. 
If there is a significant sign during purging that a mixture of last cargo and/or hydraulic oil is present, pump seals should be checked/renewed before the next cargo is loaded.

Good communication is again essential between the vessel and the Ship Operator if such maintenance might lead to a delay in availability of the tank.

 Editor: By Chief Engineer