Marine Ballast Water Pump

Introduction of Marine Ballast Water Pump

Ballast water pumps are pumps used for filling or draining ballast tanks. Also called ballast pump.

The injection and discharge of ballast water and the allocation between each tank are realized by the allocation valve box through the self-flow or ballast water pump.

Ballast pumps generally require large displacement and low head. Usually, the ballast pump is installed at the bottom of the ship and has a certain liquid column height, so it does not require dry suction capacity. Generally, a centrifugal pump or a reciprocating pump with a high specific speed is used. Depends on restrictions.

Marine Ballast Water Pump
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Arrangement of Ballast Water Pumps

The layout of the ballast piping system is characterized by the bidirectional flow of water in the pipeline, so a transfer valve box must be installed in the ballast system.

The ballast water system shall be provided with more than two ballast water pumps, the capacity of which shall be determined by the time required to discharge all the ballast water. Ships of different types and sizes have different times for all discharge of ballast water. Usually, the ballast water system is required to fill or empty the largest ballast tank within 2 to 2.5 hours, and to fill or empty the ballast water tanks of the whole ship within 6 to 8 hours.

Operation of Ballast Water Pumps

①. Ballast:

1. First close the ballast pump inlet valve, then open the undersea valve, open the ballast pump outlet valve (one globe check valve and one globe valve each) and the ballast tank intake valve that needs ballast (preferably symmetrically open), close the valve of the outboard main and the side valve.

2.At this time, the ballast pump inlet pressure gauge has a pressure display, start the ballast pump, pay attention.

Check the pressure gauge indicates that the inlet vacuum is between-0.05-0; the outlet pressure is between 0-0.4, the operation is normal. When the ballast tank is full of water, it will overflow from the corresponding vent pipe.

Close the above valve af ter ballast is completed.

②. Drainage:

1. Open the ballast pump inlet valve, open the ballast pump outlet valve and the outboard main valve and the side valve, and open the shut-off valve of the ballast tank that needs to be drained (preferably symmetrically).

2. Start the ballast pump and pay attention to the indication of the pressure gauge. The inlet vacuum is-0. Between 05-0; when the outlet pressure is between 0-0.4, the operation is normal, when the vacuum meter shows the pressure.

When the force is 0, the ballast tank is emptied, and when the vacuum gauge pressure fluctuates, some ballast tanks have been emptied.

3. Close all valves after the drainage is completed.