Bilge Pipe System

Ship when run on the sea will be dangerous when some water come in inside on the ship. If water that water little bit only may be can make corrosion on the ship, like on the floor, ship equipment like pump, valve etc. Moreover if there is puddle in side ship can cause mosquitoes can live and may be that mousqitoes can bring malaria disease or dengue faver, and this is will be dangerous for ship crue. If the water come with much capacity will give effect on ship stability or on worst condition ship will be colaps.

To avoid above condition, on ship have bilge system. This system use for take water inside ship to take out it. On some class give Lay Out of Bilge Line regulation about this as follow :

1. Germanischer Lloyd, on GL rules Machinery and System Chapter 3/11 Bilge system mentioned Bilge lines and bilge suctions are to be so arranged that the bilges can be completly pumped even under disadvantageous trim condition. Bilge suction are normally to be located on both sides of the vessel, for compartment located fore and aft in the vessel, one bilge suction may be considered sufficient provided that is capable of completly draining the relevant compartment. 
2. American Bureau of Shipping, on ABS rule 4-6-4/5.1.2 Basic Principles Bilge System mentioned : a.Function, A bilge system is intended to dispose of water which may accumulate in space within the vessel due to consideration, leakage, washing, fire fighting, etc. It is to be capable of controlling flooding in the propulsion machinery space as a result of limited damage to piping system   b.Cross flooding prevention, The system is to be designed to avoid the possibility of cross flooding between spaces and between the vessel and the sea.   c.System availability To anhace system availability, bilge pump integrity is to be assured through testing and certification; at least two bilge pumps are to be provided, and bilge suction control valves are to be accessible for maintenance at all time   d.Oil Polution Prevention. Provision is to be made to process oily bilge water prior to dischargeing overboard.

Bilge system consits of : Pumps, Motor to runs pumps, Piping, and Control devices.

Bilge pump used for transfering bilge water from some bilge area to bilge holding tank or take out it dirrectly. There are some class requirement must follow for bilge pump.

1. Bilge pump capacity, depend on ABS steel vessel rules 2012, when only 2 bilge pumps are fitted, each is to be capable of giving a speed of water through the bilge main required by 4-6-4/5.3.1(a) of not less than 2 m (6.6 ft) per second. the minimum capacity Q of the required Bilge Pump may be determined from the following equation :                                        

   

1. Bilge pump capacity depend on GL rules Sea Going Ship, Section 11 Piping system, Valves and Pump, Letter N Bilge System point 3.1 Capacity of bilge pump mentioned that each bilge pump must capable of delivering 

Where centrifugal pumps are used for bilge pumping, they are to be self priming or connected to an air extracting devices. We can use other pump use for bilge pump like Ballast pump, stand by sea water cooling system pump and general service pump they are self priming and of the required capacity according to above formulla. For fuel and oil pump are not to be allowed to be bilge pump.

For minimum bilge pipe size, as follows :

1. Depend on GL rules :