5 Bilge System
5.1 General
5.1.1 Application
The provisions of 4-6-4/5 apply to bilge systems serving propulsion and other machinery spaces, dry cargo spaces and spaces where accumulation of water is normally expected. Additional requirements for bilge systems of specialized vessels are provided in Part 5.
5.1.2 Basic Principles
5.1.2(a) Function. A bilge system is intended to dispose of water which may accumulate in spaces within the vessel due to condensation, 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 systems. 5.1.2(b) Cross-flooding prevention. The system is to be designed to avoid the possibility of cross-flooding between spaces and from the sea to the vessel. 5.1.2(c) System availability. To enhance 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 times. 5.1.2(d) Oil pollution prevention. Provision is to be made to process oily bilge water prior to discharging overboard.