Abstract: A ballast pumping system for pumping water ballast to or from a plurality of ship ballast tanks, having a submerged pump located in one of the ballast tanks and a sea chest provided in the ballast tank together with the pump. Piping interconnects the pump and the sea chest, and also connects the pump to each of the bottoms of the ballast tanks.
Abstract: A tanker having a bow part, a stern part, and a midship tank part between them with a inner bottom therein. The midship tank part is divided by bulkheads into cargo tanks above the inner bottom, segregated deep ballast tanks at the same level as the cargo tanks, and segregated double bottom ballast tanks under the inner bottom.