Marine pump refers to the machinery used on the ship to increase the pressure or potential energy of liquid and liquid materials to make them flow. Generally, pumps must be used to transport liquid to high positions, long distances and high pressures. The pumps can also be used to generate high-pressure liquid for hydraulic transmission. The pump is driven by a motor or other prime mover. The characteristics of marine pump are as follows: the pump shall not be cavitation due to the fluctuation of suction liquid level when the ship swings and tilts; In order to reduce the occupied area of the pump and facilitate maintenance, the vertical structure is generally adopted; The flow passage parts of marine castings are made of bronze, brass or stainless steel castings to minimize corrosion.

Marine pumps are widely used in modern ships. Generally speaking, a diesel powered cargo ship needs 36-50 pumps of various types, accounting for 20% - 30% of the total mechanical equipment of the ship.