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97535 MICROBIALINFLUENCED CORROSION IN CARGO OIL TANKS OF CRUDE OIL TANKERS

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Product Number: 51300-97535-SG
ISBN: 97535 1997 CP
Author: Rong T. Huang, Beverly L. McFarland, Ronald Z. Hodgman
Industry: Oil and Gas Production
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Excessive pitting corrosion in the uncoated bottom platings of cargo oil tanks was detected in newbnilt crude oil tankers only 2 to 5 years old, and was diagnosed as microbial influenced corrosion (MIC). Sulfate-reducing bacteria (SRB) concentrations reached as high as 100,000 to 10,000,000 per milliliter in the settled water at the bottom of the cargo oil tanks. Biocide treatment to control MIC was studied in the laboratory using microbial consortia isolated fkom cargo oil tank bottoms. Biocide treatment to control MIC was attempted experimentally, but was found to be impractical onboard tankers. A MIC mitigation strategy, employing an enhanced pitting inspection and repair program combined with the coating of the bottom platings, was developed and implemented for existing crude oil tankers. Considerations for improvement of future newbuild crude oil tankers are also presented. Keywords: MIC, SRB, corrosion, pitting, cargooil tank, tankers, crude oil, corrosion rate,coating
Excessive pitting corrosion in the uncoated bottom platings of cargo oil tanks was detected in newbnilt crude oil tankers only 2 to 5 years old, and was diagnosed as microbial influenced corrosion (MIC). Sulfate-reducing bacteria (SRB) concentrations reached as high as 100,000 to 10,000,000 per milliliter in the settled water at the bottom of the cargo oil tanks. Biocide treatment to control MIC was studied in the laboratory using microbial consortia isolated fkom cargo oil tank bottoms. Biocide treatment to control MIC was attempted experimentally, but was found to be impractical onboard tankers. A MIC mitigation strategy, employing an enhanced pitting inspection and repair program combined with the coating of the bottom platings, was developed and implemented for existing crude oil tankers. Considerations for improvement of future newbuild crude oil tankers are also presented. Keywords: MIC, SRB, corrosion, pitting, cargooil tank, tankers, crude oil, corrosion rate,coating
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