Air Start Systems Flashcards

1
Q

What are the three main sources of explosions in an air start system for a slow speed engine?

A
  1. A leaking start air valve
  2. Fuel leaking into the cylinder whilst the engine is stopped
  3. Auto ignition of oil deposited on the inner surface of the start air manifold
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2
Q

How can you minimise the risk of a start air explosion?

A

Oil carry over from the compressor should be minimised. Class regs require air compressor air intakes are located in an oil free atmosphere and a drain/filter for intercepting oil/water between compressor discharge and receiver.

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3
Q

What is required on the air system for direct reversing engines with a greater bore than 230mm?

A

The air start system must be protected with flame arresters or bursting discs for each cylinder, fitted between the cylinder start air valve and the manifold.

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4
Q

What must be fitted for non-reversing and auxiliary engines with a bore greater than 230mm?

A

A single flame arrester or bursting disc is acceptable fitted at the supply Inlet to the starting air manifold.

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5
Q

What sort of practices can lead to explosions in the main air start system?

A
  • Tell tales/drains at each end of the starting air manifold found blacked off.
  • Failure to drain start air receivers and starting air pipes at regular intervals
  • Failure to check for leaking start air valves
  • Failure to maintain starting air valves and systems in accordance with manufactures instruction.
  • Failure to maintain fuel valves
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