They are F. O. pumps, L. O. pumps, ballast pumps, fresh water pumps, sea water pumps, and bilge pumps.
cargo and ballast pump speed control system
rotary gas ballast pump
ballast pump control system
ballast pump status-indicating system
In this paper, method of calculation for pumping of water vapour with gas ballast pump is introduced.
Function test and automatic controller test for ballast pump.