LIQUID PUMP APPARATUS LIQUID STORAGE TANK THEREWITH BALLAST TANK FOR A MARINE VESSEL AND VESSEL HAVING A BALLAST TANK

摘要

Embodiments of the present inven provide a liquid pump apparatus. The liquid pumping device includes an immersion assembly having at least one immersion member with a liquid conduit thereon along at least a portion of its length, wherein the immersion assembly includes at least a portion of the immersion assembly in a liquid to be pumped And the liquid pumping device supplies the liquid in the tank to the liquid in the tank through at least one immersing member at one of a plurality of vertically spaced apart positions of the immersion assembly to cause liquid to flow through the immersion assembly into the liquid inlet And the liquid pumping device is configured so that the position at which the gaseous fluid is supplied to the immersion assembly is selected to be the position at which the pressure head of the liquid in the tank is within a predetermined range of values.