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02201 EXCESSIVE RATE OF MIC ON 316 SS IN SEAWATER

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Product Number: 51300-02201-SG
ISBN: 02201 2002 CP
Author: A.Kh. Bairamov, R. Bradley, M.N. AI-Sonidah, Toseef Ahmed, and Jim Liang
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This paper presents the results of investigations, which revealed an extremely high rate of microbiologically induced corrosion of 316 SS plugs used in the tube side of a horizontal titanium heat exchanger operating with Arabian Gulf seawater. Service life to failure was approximately 2.5 years. Operating temperatures at the inlet and outlet were 37°C and 43°C respectively. Site inspection revealed that the conical plugs, with average lengths of 74 mm and maximum diameters of 21 mm, were heavily fouled and some of them were completely covered by a dark-brown slimy paste-like deposit. Analysis of this deposit showed the presence of a relatively high concentration (11 wt. %) of organic matter. Severe local damage in the form of egg-shaped hollows and "bottle-shaped" pits with narrow mouths was found. Calculated corrosion rate was about 8.2 mm/year (323 mpy), which is very high for this alloy in such an application. The results of the SEM/EDS, FTIR and wet analysis are presented and discussed. FGS microbiological test kit analysis registered a severe level ("positive ++'') of anaerobic bacteria content in the deposit. The titanium tubes and robe sheet were in very good condition. Keywords: 316 SS plug, titanium heat exchanger, seawater, microbiologically induced corrosion, fouling, "egg-shaped hollow", "bottle-shaped pit".
This paper presents the results of investigations, which revealed an extremely high rate of microbiologically induced corrosion of 316 SS plugs used in the tube side of a horizontal titanium heat exchanger operating with Arabian Gulf seawater. Service life to failure was approximately 2.5 years. Operating temperatures at the inlet and outlet were 37°C and 43°C respectively. Site inspection revealed that the conical plugs, with average lengths of 74 mm and maximum diameters of 21 mm, were heavily fouled and some of them were completely covered by a dark-brown slimy paste-like deposit. Analysis of this deposit showed the presence of a relatively high concentration (11 wt. %) of organic matter. Severe local damage in the form of egg-shaped hollows and "bottle-shaped" pits with narrow mouths was found. Calculated corrosion rate was about 8.2 mm/year (323 mpy), which is very high for this alloy in such an application. The results of the SEM/EDS, FTIR and wet analysis are presented and discussed. FGS microbiological test kit analysis registered a severe level ("positive ++'') of anaerobic bacteria content in the deposit. The titanium tubes and robe sheet were in very good condition. Keywords: 316 SS plug, titanium heat exchanger, seawater, microbiologically induced corrosion, fouling, "egg-shaped hollow", "bottle-shaped pit".
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