Slop tank – Slop tank means a tank specifically designed for the collection of tank drainage ,tank washing and other oily mixtures.
Handling of slops
Mixture settle down during the passage water being more dense settles downwards and oil keep floating on top.
the water which has settle down is now passed through ODMCS( which ensures that the oil concentration present in this water is below federal standards.) And then to TWV and from there through spool and manual valve which discharges overboard.
Oily water that cannot fullfill ODMCS Criteria returns back to tank.
The oil floating on top is given to shore .