復水器冷却管の海水による腐食

概要

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In this paper, the corrosion of condenser tubes is investigated experimentally. The test pieces of these tubes of 16.0mm O.D.and of 200mm length used here are an Albrac tube of 13.6mm I.D., a titanium tube of 15.4mm I.D., a composite tube of 11.8mm I.D., and a sea water resistance stainless steel tube of 14.4mm ID. The composite tube also consists of Albrac tube fixed into a stainless steel tube.<BR>Each kind of these tubes was continuously cooled by sea water from September 1990 to August 1991. The total running period of the experiments was 8, 100 hours (about 337 days), and the average cooling sea water velocity was about 2.0m/s.<BR>The chemical analysis of sea water during testing period was carried out. And the amounts of scale deposition and of corrosion of inner surface of the tubes, the surface roughness, the results of surface observation by electron microscopy, and the results of qualitative-quantitative analysis by X-rays were respectively compared for each tube.<BR>Also, these experimental results by continuous cooling were compared with the results of corrosion study using same kind of tubes by intermittent cooling carried out previously in 1986.