Class 2 (2nd Engineer) MEP 📅 Jan 2021

Exam Question

Why does an explosion occur in the starting air line of an interal combustion engine and how can the possibility of such an occurrence be reduced? Sketch and describe devices, which may be fitted to reduce the severity of such an explosion. State the attention which air starting valves should be given before maneuvering passage.

Reference Answer

Cause of starting air line explosion:
The main cause of starting airline explosion is the leaking starting air valve or jamming at the open position of the valve.
Initially, the oil that is discharged from the air compressor to the starting airline system will deposit as a thin, moist film on the internal surface of the pipes but is not ready for combustion.
If the starting air valve leaks or is jammed at an open position, hot gas or flame may enter the starting air manifold, vaporise the oil and set fire to oil mist and greasy matter, which generally deposit on the surface.

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