Introduction Since the world oil crisis in the mid‐seventies, there has been an ever increasing tendency to use high distillate heavy fuels as a substitute for conventional marine fuels. The policy by shipping companies to use this lower cost fuel has proved to have long‐term detrimental effects through increased corrosion, both in the engine and auxiliary equipment unless remedial action was taken. The basic problem has been the level of hydrocarbon content in the fuel. Inadequate combustion of the hydrocarbons during the burning of the oil has led to free carbon formation. There has also been fouling due to impurities in the fuel and problems with sludge deposition and fuel stratification in the fuel lines and storage tanks.
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