Corrosion Loss in the Chemical Plants of Chugoku-Shikoku District of Japan
The Project Team on Corrosion Loss, Chugoku-Shikok
An investigation on the corrosion loss has been carried out from the view of industrial economy during the period of 1996 and 1997 fiscal year. Two different approaches, initiated by T. P. Hoar and by H. H. Uhlig respectively, were both adopted for this investigation. Questionnaires based on the Hoar approach were mailed to 111 chemical factories of which 43 factories have responded. The questionnaires composed of 13 independent questions to collect information on several items such as size of total production, investment in plant and equipment and expense for corrosion protection. In the Uhlig approach, which analyzes the production data in the industries related to the corrosion, the survey proceeded for the cost analyses of 8 basic topics. The Uhlig approach underestimated the corrosion loss as compared with that in the Hoar approach. The ratio of indirect over direct corrosion loss was estimated to be in the order of 0.1 irrespective of the character of each individual plant.