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?

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Sulfur from the fuel condensing on cold surfaces forming sulfuric acid. Ensure cooling water temperatures maintain the combustion space temperatures above the dew point of sulfuric acid.

Answer

Sulfur in exhaust gas mixing with water vapor condensation. Order cylinder oil of lower total base number.

Answer

Vanadium from fuel melting in the exhaust gases. Maintain lower cooling water temperature to prevent vanadium from melting.

Answer

Low temperature corrosion cannot be observed; it has to be determined by metallurgical testing. Maintain cooling water temperatures as per manufacturer's specifications.

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