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11130 Monitoring Of Corrosion Parameters Within the Annular Space of Cased Natural Gas Transmission Pipelines

Picture for 11130 Monitoring Of Corrosion Parameters Within the Annular Space of Cased Natural Gas Pipelines
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Product Number: 51300-11130-SG
ISBN: 2011 11130 CP
Author: Frank G. Hemerlein, Vincent Pastore and Diego Politano
Publication Date: 2011
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A method to evaluate the corrosive environment of annular spaces within casings of natural gas transmission pipelines using commercially available, “off the shelf” equipment has been devised and implemented. Three separate locations were selected for test monitoring of corrosion rates on steel carrier pipelines operating within these environments. The locations were monitored for 22-26 months and average corrosion rates were established for a variety of representative conditions. Test results confirmed the initial hypothesis that cased pipeline segments exist in relatively benign environments as long as cathodic protection/coating systems and electrical isolation status between carrier and casing are maintained. These results lend further credence to the position that cased segments are inherently safer than uncased segments due to the extra layer of protection from third party damage which remains the most significant threat to pipeline integrity.

Keywords: corrosion rate, casings, cased pipeline segments, annular space, direct assessment, high consequence areas, natural gas transmission pipeline, external corrosion direct assessment, ECDA, electrical resistance (ER) corrosion rate probes.
A method to evaluate the corrosive environment of annular spaces within casings of natural gas transmission pipelines using commercially available, “off the shelf” equipment has been devised and implemented. Three separate locations were selected for test monitoring of corrosion rates on steel carrier pipelines operating within these environments. The locations were monitored for 22-26 months and average corrosion rates were established for a variety of representative conditions. Test results confirmed the initial hypothesis that cased pipeline segments exist in relatively benign environments as long as cathodic protection/coating systems and electrical isolation status between carrier and casing are maintained. These results lend further credence to the position that cased segments are inherently safer than uncased segments due to the extra layer of protection from third party damage which remains the most significant threat to pipeline integrity.

Keywords: corrosion rate, casings, cased pipeline segments, annular space, direct assessment, high consequence areas, natural gas transmission pipeline, external corrosion direct assessment, ECDA, electrical resistance (ER) corrosion rate probes.
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