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Experience in the Prediction of Corrosion Growth Rates in Oil and Gas Pipelines

Lookup NU author(s): Dr Julia Race


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In order to develop effective integrity management plans for corroding pipelines, operators need to be able to estimate realistic internal and external corrosion growth data. Corrosion growth rates are an essential input into future integrity assessments, rehabilitation planning and also allow safe and cost effective operating and maintenance strategies to be developed. One of the most accurate methods of obtaining actual corrosion growth rates is by comparing signals from subsequent high resolutions in-line inspections. However, this type of data is not always available, e.g. for pipelines that have had only one inspection or are uninspectable. Qualitative risk based models for estimating internal and external corrosion growth rates have been the subject of much recent research. In this paper, this approach is developed further, taking into account our experience in conducting repeat inspections on over 9000 miles of on and off–shore, liquid and gas pipelines. This experience has allowed corrosion rates to be measured and coupled with pipeline environmental and operational data in a database. This paper describes the development of this database, discusses the results in terms of corrosion rate distributions and compares the measured rates with recommended direct assessment approaches.

Publication metadata

Author(s): Race JM; Sofos P; Dawson SJ

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 4th International Conference on Pipeline Technology

Year of Conference: 2004