Corrosion in Steel Gas Pipelines: Prevention, Detection, Assessment, Repair and Refurbishment
Engineering Honours Degree 2006
University of Adelaide
This paper outlines the issues involved with pipeline corrosion. There is a huge infrastructure of oil and gas transmission pipelines around the world. To keep these pipelines safe and in a working order action must be taken to prevent pipeline corrosion and maintain the integrity of these pipeline assets. The corrosion mechanism for pipelines is discussed and prevention methods including coatings and cathodic protection are also compared. Detection of pipeline corrosion is a task an operator / owner must perform to determine and maintain the integrity of the pipeline. If corrosion is detected the operator must justify that this corrosion is not compromising the integrity of the pipeline and this is commonly done with field verifications and defect assessment. These individual tasks are discussed in detail and insight is given into the gains found from in properly utilising captured data. The assessment methods for corrosion defects play a part in the refurbishment process implemented on a pipeline with corrosion. New and old repairs for pipeline defects are also investigated. All of the tasks involved with maintaining pipeline integrity come down to the amount of conservatism the operator / owner wants to implement and of course economics. Research into pipeline corrosion has not been extensive however this could be set to change as this infrastructure gets older and the potential for failure becomes more apparent.