New IACS requirements to avoid crankcase explosions

The International Association of Classification Societies (IACS) has agreed to significant revisions of two of its Unified Regulations (UR). These are M10 (Protection of internal combustion engines against crankcase explosions) and M9 (Crankcase explosion relief valves for crankcases of internal combustion engines).

The former deals with the detection of a potential crankcase explosion through oil silt detection and monitoring equipment; the latter sets the standards for relief valves which, in case a crankcase explosion does occur, would mitigate the effect on people and on the engine itself. 

To support these revisions, IACS has developed two new URs: M 67 (IACS Type Testing Procedure For Crankcase Oil Mist Detection/Monitoring and Alarm Arrangements) and M66 (IACS Type Testing Procedure for Crankcase Explosion Relief Valves). These new UR provisions will take effect on 1 January 2006 and will apply to all applications for certification of an engine after that date, and to all new buildings contracted from 1 January 2006.

The text of these new provisions can be seen here

Contact:Dragos Rauta