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A program to detect corrosion under insulation has been ongoing at the Stenungsund ethylene plant since 1976. Experience to prioritize inspection has been developed. During the years 1978 to 1980, the number of yearly inspected lines with more than 0.5-mm corrosion decreased from 50 to 15%. A survey of the condition of 530 pressure vessels was carried out in 1980. Corrosion was found under hot insulation on 75% of not painted vessels and on 20% of painted and insulated vessels. No corrosion was found on equipment in continuous cold service.
corrosion, atmospheric corrosion, insulation, experience
Engineering associate, Esso Chemical AB, Stenungsund,