Section 26(5) in The Merchant Shipping (Prevention of Pollution by Oil from Ships) Rules, 2010
(5)In order not to exceed the volume limits established by sub-rules (2), (3) and (4) and irrespective of the accepted type of cargo transfer system installed, when such system interconnects two or more separating the tanks from each other. These valves or devices shall be closed when the tanker is at sea.
