CB/T497-2012 Suction coarse water filter 

Low Pressure Return Oil Filter is located behind the bilge inlet, and Suction Water Filter is usually located at the bilge. As required by the main engine, there must be cooling water in the engine room. Other air conditioning systems usually have their own cooling systems, so the air conditioning cabin will also have its own Air Filter. The water inlet of the fire extinguishing system is usually arranged in the engine room, taking into account the daily seawater intake. If the daily intake of seawater is large, it is estimated that there will be an independent water inlet. If there is an auxiliary engine, a cooling water inlet is also required in the auxiliary engine room.