a close-up of the ship's ballast pump in the engine room of a cargo vessel.

electricity operations stabilize unloading transport industry closeup ballast loading machine factory engine vessel system ships cargo vital wheel pump room ship iron background pump water ballasting boat centrifugal control electric electricity energy engine room engineer engineering equipment factory gear industrial industry job labor machine machinery maintenance mechanical mechanism merchant ship metal motor pipe pipeline piping plant plumber power pressure profession real repair repairman steel system technology treatment valve water work