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Scavenge Fires (2- Strokes)
Fires in the scavenge spaces of diesel engines can be caused by wear of mechanical components, faulty fuel injection, inefficient exhaust system and incorrect cylinder lubrication. Scavenges spaces shall be drained regularly each day and manually cleaned on a regular basis, but not exceeding 2 months so that the risk of scavenge fires is kept to a minimum. When inspecting scavenge trunks, the condition of piston rings should also be checked, remember to carefully ventilate scavenge spaces before inspecting. Also ensure that enclosed space entry permit is issued prior to entering the scavenge spaces.

Scavenge fires are extremely dangerous and it is important that quick and effective action is taken to rectify the situation.
• Engine revolutions must immediately be reduced to a minimum.
• If possible the fuel is to be cut off from the cylinder unit concerned.
• If more than one cylinder is involved then it will be more effective if the engine is stopped and the turning gear engaged and continuous turning commenced.
• The cylinder lubricators are then to be advanced to the maximum setting on the effected cylinders.
• Turbocharger air intakes are to be blanked off.
• Scavenge space relief valves where possible can be secured, and isolating flaps shut.
• All external scavenge space surfaces must be carefully scrutinized for outbreaks of fire and strategic cooling applied as necessary.
• There are various types of scavenge space fire extinguishing systems in use i.e. steam, dry powder, and CO2.
The system applicable to your engine is to be operated strictly according to the manufacturer’s instructions. Particular attention must be paid to any precautions which have to be taken, e.g. the engine must only be operated within the rpm ranges specified by the manufacturer.

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