5.9 Testing and Trials The bilge system is to be tested under working conditions, see 4-6-2/7.3.3. See also 3-7-2/3 for bilge system trials.
7 Ballast Systems
7.1 General These requirements apply to ballast systems for all vessels. They are intended to provide a reliable means of pumping and draining ballast tanks through the provision of redundancy and certification of ballast pumps, and the provision of suitable remote control, where fitted.
7.3 Ballast Pumps For self-propelled vessels 20 m (65 ft) in length or greater, all ballast tanks are to be connected to at least two power driven ballast pumps, one of which may be driven by the propulsion unit. Sanitary, bilge and general service pumps may be accepted as independent power ballast pumps. Alternative means of deballasting, such as an eductor or a suitable liquid cargo pump with an appropriate temporary connection (e.g., portable spool piece arranged in accordance with 5C-1-7/3.3.4(d) of the Steel Vessel Rules) to the ballast system, may be accepted in lieu of a second ballast pump.
Ballast pumps are to be certified in accordance with 4-6-1/7.3.