Section 5(3)(d) in The Merchant Shipping (Control of Pollution by Noxious Liquid Substances in Bulk) Rules, 2010
(d)be provided with pumping and piping arrangements, which, to the satisfaction of the Central Government, ensure that the quantity of cargo residue remaining in the tank and its associated piping after unloading does not exceed the applicable quantity of residue as required by sub-rules (1), (2), (3) of rule 12; and