- Top Wash:-
- The washing area is from the joint section of the upper deck and the bulkhead downward to a height slightly above the oil surface.
- In the case of multi-stage system, each stage should be overlapped.
- In general, sludge accumulates on the horizontal girders, the top wash therefore should be started when the oil level reaches about three (3) metres above the bottom unless specified in vessel‘s COW operation Manual.
- The top wash terminates when the remaining oil level goes down to about 1.5 metres above the bottom.
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