Which risk increases when an internal combustion engine crankshaft operates at higher rotational speeds but with insufficient lubrication?

💡 Explanation

When a crankshaft operates at high speeds with inadequate lubrication, metal-to-metal contact leads to increased cyclic stress because the oil film cannot adequately separate the surfaces, initiating micro-cracks and eventually leading to fatigue failure. Therefore fatigue failure results, rather than detonation, oxidation or creep, which occur through entirely different phenomena.

• Which primary risk arises during multi-pass welding of thick structural steel sections?
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• Which risk increases when the scroll compressor outflow valve in a large-scale LNG pump fails closed?
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