GABON LINE CORROSION-1 COATING DISBANDMENT LEADS CAUSES OF EXTERNAL PIPELINE CORROSION

Marcel Roche Societe Nationale Elf Aquitaine Pau, France Internal corrosion has proved the most persistent corrosion problem on the approximately 670 miles of pipelines operated since 1959 by Elf Gabon. Causes include the presence of CO2 in polyphasic lines, residual oxygen and sulfate-reducing bacteria (SRB) in water-injection lines, and bacterial corrosion in crude-oil lines. External corrosion has been less troublesome, caused either by atmospheric marine exposure with frequent wetting or by

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