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07699 Gas Distribution Transmission Pipelines External Corrosion Direct Assessment - A Case Study

Picture for 07699 Gas Distribution Transmission Pipelines External Corrosion Direct Assessment - A Case Study
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Product Number: 51300-07699-SG
ISBN: 07699 2007 CP
Author: Dirk Van Oostendorp, Nolan Earle, Robert Forbes
Publication Date: 2007
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The Southeast Alabama Gas District (SEAGD) has been engaged with the development of in-depth analysis, field data interpretation, validation and analysis pertaining to the integrity of natural gas transmission pipelines. The integrity assessment of the subject pipelines included urban and rural settings, and was complicated by pipelines under asphalt and concrete at road crossings. The project attempted to utilize various AC attenuation survey methods (specifically Pipeline Current Mapper (PCM) and Alternating Current Voltage Gradient (ACVG)) and Long Range Guided Wave Ultrasonic Testing (LRGWUT) technology to accurately identify, categorize and locate corrosion defects along significant portions of the transmission portion of a regional distribution network. This paper presents the main findings, conclusions and recommendations generated over the period (2004-2006), carefully taking note of the latest Natural Gas Integrity Rules (DOT49 CFR Part 192), drawing on practical experience, as well as the relevant NACE Recommended Standard RP0502-2002 for ECDA. The potential impact of corrosion failures on public safety and the environment is rationalized during the process by the delineation of “Class 3 High Consequence Areas” and “Identified Sites” as applied to the ECDA. The case study should be of value to other gas distribution companies as lessons learned which could promote a common understanding and direction for the benefit of all parties concerned.
The Southeast Alabama Gas District (SEAGD) has been engaged with the development of in-depth analysis, field data interpretation, validation and analysis pertaining to the integrity of natural gas transmission pipelines. The integrity assessment of the subject pipelines included urban and rural settings, and was complicated by pipelines under asphalt and concrete at road crossings. The project attempted to utilize various AC attenuation survey methods (specifically Pipeline Current Mapper (PCM) and Alternating Current Voltage Gradient (ACVG)) and Long Range Guided Wave Ultrasonic Testing (LRGWUT) technology to accurately identify, categorize and locate corrosion defects along significant portions of the transmission portion of a regional distribution network. This paper presents the main findings, conclusions and recommendations generated over the period (2004-2006), carefully taking note of the latest Natural Gas Integrity Rules (DOT49 CFR Part 192), drawing on practical experience, as well as the relevant NACE Recommended Standard RP0502-2002 for ECDA. The potential impact of corrosion failures on public safety and the environment is rationalized during the process by the delineation of “Class 3 High Consequence Areas” and “Identified Sites” as applied to the ECDA. The case study should be of value to other gas distribution companies as lessons learned which could promote a common understanding and direction for the benefit of all parties concerned.
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