Evidence of low temperature corrosion is observed on the combustion space components of a slow- speed diesel engine. What causes this corrosion and what can one do to mitigate this situation?
• Low temperature (cold-end) corrosion in diesel engine exhaust and combustion spaces • Role of sulfur in fuel and formation of sulfuric acid (H₂SO₄) in presence of water/condensation • Effect of cooling water temperature on metal surface temperature and dew point of acid
• Which fuel impurity is most commonly linked with cold corrosion in slow-speed diesel engines: sulfur or vanadium? • Does low temperature corrosion become worse when metal surfaces are colder or hotter than the acid dew point? • Among the options, which action would keep combustion space surfaces warm enough to avoid acid condensing on them?
• Identify which choices talk about sulfur + water/condensation forming an acid on cold surfaces • Check which option suggests keeping cooling water temperature high enough so metal surfaces stay above the acid dew point • Eliminate any choice that claims low temperature corrosion cannot be observed or that recommends making surfaces colder when talking about acid condensation
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