What is required for crosshead type engines that have a scavenging space in open connection to the cylinder?

Ans. The scavenge space to be permanently connected through an approved fire extinguishing system, entirely separated from the extinguishing system of the engine room.

           When the scavenge space is connected to the under side of the piston, there is every possibility of scavenge fire if the blowpast of the hot exhaust gas takes place due to worn out cylinder liner or broken piston rings or piston ring cut off in the groove. In such circumstances, the hot gases or the spark, entering the scavenge space, will start burning the sludge and accumulated oil inside the scavenge space. As plenty amount of air is available this scavenge fire may continue for a longer period and it may also go beyond control. Hence it is necessary that a permanent arrangement must be provided so that if all other means, such as stopping of the engine and covering the exhaust and the turbocharger suction filter with a cloth, fail. In such circumstances, it should be possible to extinguish the fire by the use of a permanent extinguishing medium which is connected to the underside of the piston scavenge space mostly CO2 or steam is utilized. The requirement for this is very small and it should be independent of the engine room system because if it is connected to the engine room fire fighting system, it may possible that you may discharge the complete safe battery of the cylinder which are actually kept for the engine room fire. In such condition, engine room fire fighting equipment capacity will be reduced. Hence the scavenge space fire fighting installation should be entirely independent of the engine room fire fighting installation.

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