Part 2. Inhibitors in Cargo. Magnitude of corrosion losses in tankers is detailed. One typical tanker in coastwise service, after 195 mixed cargoes, or approximately eight years’ service, had top 18 feet of all cargo bulkheads renewed at a direct cost of $250,000, an average of $1300 per voyage. Lower bulkheads must be replaced in four years, making total corrosion cost $50,000 to $75,000 a year for direct steel replacement costs. Additional costs include $3000 to $8000 a day for lost time while ship is under repair, the difference between normal drydocking and extensive bulkhead renewal being three to four weeks.
Tests on paints, dehumidification, metallic coatings, cathodic protection and water soluble inhibitors show these to be unsatisfactory. An oil soluble inhibitor, on the basis of a 9 months’ comparative test, show Monsanto Chemical Company’s Santoline C has sufficient merit to warrant additional investigation.
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(*Note: This abstract was not a part of the original publication of Part 2.)
