Regional Cathodic Protection Design of a Natural Gas Distribution Station
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Regional cathodic protection has significant impact on pipeline integrity management. After risk analysesof a newly built gas distribution station constructed in an area with large dwelling density, risk score washigh because of potential threat caused by galvanic corrosion. Except reinforced steel in concrete, thereare four kinds of metal buried under earth: carbon steel, galvanized flat steel, zinc rod and graphite module. To protect buried pipeline from external corrosion, design and construction of regional cathodic protectionwas proposed. Current density was measured with potential using potential dynamic test and boundary elementmethod (BEM) was used to calculate current requirement and optimize best anode placement during design. From our calculation on the potential, optimized conditions for this area were that an applied current was3A and anode was placed at 40 meters deep from the soil surface. It results in potential range between-1.128 VCSE and -0.863 VCSE, meeting the -0.85 VCSE criterion and the -1.2 VCSE criterion that no potentialwas more negative than -1.2 VCSE to cause hydrogen evolution at defects in coating of the pipeline.
Abstract
Regional cathodic protection has significant impact on pipeline integrity management. After risk analysesof a newly built gas distribution station constructed in an area with large dwelling density, risk score washigh because of potential threat caused by galvanic corrosion. Except reinforced steel in concrete, thereare four kinds of metal buried under earth: carbon steel, galvanized flat steel, zinc rod and graphite module. To protect buried pipeline from external corrosion, design and construction of regional cathodic protectionwas proposed. Current density was measured with potential using potential dynamic test and boundary elementmethod (BEM) was used to calculate current requirement and optimize best anode placement during design. From our calculation on the potential, optimized conditions for this area were that an applied current was3A and anode was placed at 40 meters deep from the soil surface. It results in potential range between-1.128 VCSE and -0.863 VCSE, meeting the -0.85 VCSE criterion and the -1.2 VCSE criterion that no potentialwas more negative than -1.2 VCSE to cause hydrogen evolution at defects in coating of the pipeline.
참고문헌 (5)
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