The officers and crew members responsible for operating the ballast pumps and valves must be fully conversant with the line up and meaning of various “valve indications” and symbols provided on the ballast line up diagrams in Cargo control room and Pump room. They should be able to differentiate between indication of manual valves, hydraulic valves, manual-hydraulic valves, suction and discharge gauges for pumps and the prime mover for ballast pumps such as steam, electricity or hydraulic pressure. This helps a lot in executing the whole operation smoothly.