SL2022-730/PRP Prevention of crankcase explosions

Safe design and operation of two-stroke MAN B&W combustion engines are key to MAN Energy Solutions. Over the years, we have come across examples of non-MAN Energy Solutions safety systems that failed to meet the required standard and human
behaviour that potentially could result in crankcase explosions.

Crankcase explosions pose a serious threat to both property and persons, and may even result in bodily injuries and/or fatal casualties.

In the past year, MAN Energy Solutions has received reports of destructive crankcase explosions on a number of older MAN B&W engine designs. The safety equipment decribed in this service letter and proper response to alarms from such equipment, with slow down or engine stop and subsequent fault identification, could have prevented these explosions. This service letter draws attention to the latest relevant safety components developed by MAN Energy Solutions and includes a specification of the recommended and proper execution of maintenance routines.

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