How is crankcase explosion prevented?

Preventive measure of crankcase explosion There should be adequate cooling of the engine. Proper purification and analysis of lube oil. Lube oil filter to be changed over & cleaned as per schedule. Ensure proper cylinder lubrication by checking the condition of piston, piston rings and liner through scavenge ports.

How is crankcase explosion detected?

For example, just before the explosion, the engine will show sudden noise, irregular running, high exhaust temperature, a sudden increase in load and smell of oil mist. Thus safety device in the form of an oil mist detector is installed to check and avoid crankcase explosion in the first place.

What do you do after crankcase explosion?

What will be your action after detecting a hot spot?

1. Inform chief engineer & bridge.
2. Reduce the engine speed to reduce the heat generation.
3. Increase lubrication to the running surfaces.
4. Keep clear off crankcase relief door to prevent personnel injury, keep fire extinguisher ready and open skylight.

What is primary and secondary crankcase explosion?

The primary explosion produces a shock wave which propagates inside the crankcase with increasing speed and distance traveled. This explosion is known as secondary explosion and it causes very severe damage to engine plating. Crankcase explosions have been a result for the loss of several lives of people in the past.

What is the possible cause why the crankcase oil enter the scavenge space?

Causes of Scavenge Fire Presence of fuel oil in the scavenge spaces due to defective fuel injectors, incorrect pressure setting of injectors or fuel particles landing on the cylinder liner due to excessive penetration. Excessive cylinder lubrication which is drained down to scavenge spaces.

In which of the following engine crankcase explosion occurs?

Crankcase explosion in I.C. engines usually occurs as First a mild explosion followed by a bi explosion. Crankcase explosions are also the result of high operating temperatures of the engine. The main cause of crankcase explosions are the development of hot spots at various places in the crankcase.

What is crankcase relief door?

2. Crankcase relief doors. The Crankcase relief doors are also fitted to prevent any damage to the crankcase and ingress of fresh air inside the crankcase. The crankcase doors are spring loaded valves which lift up in case there is any rise of pressure inside the crankcase.

What are the causes of starting air line explosion?

The main cause of starting airline explosion is the leaking starting air valve or jamming at open position of the valve. Initially, the oil which is discharged from the air compressor to starting air line system, it will deposit as a thin moist film on the internal surface of the pipes but not ready to combustion.

How do you stop a scavenge fire?

Prevention of Scavenge Fire

1. Clean scavenge space and drain at regular intervals.
2. Keep scavenge space drain open at regular intervals.
3. Excess cylinder lubrication must be avoided.
4. In case of timed lubrication, the time has to be checked as per PMS.
5. Piston rings must be properly maintained and lubricated adequately.