1.8 Bilge and ballast a general service pump has suctions from sea ballast main, bilge main and engine room bilge with discharges to the fire main, the ballast main the oily water separator and overboard. In this way, three pumps provide effective alternatives for all essential services in the event of breakdown of one or even two. Many ships will have more generous provision and all passenger ships will have a submersible fire and bilge pump, supplied with power from an emergency dynamo1.8 Bilge and ballast • A general service pump has suctions from sea, ballast main, bilge main and engine room bilge with discharges to the fire main, the ballast main, the oily water separator and overboard. In this way, three pumps provide effective alternatives for all essential services in the event of breakdown of one or even two. Many ships will have more generous provision and all passenger ships will have a submersible fire and bilge pump, supplied with power from an emergency dynamo