Abstract
Hydrocarbons are mainly transported by undersea or underground pipelines. Metal loss due to corrosion is one of the most common situations leading to pipeline loss of integrity. There are various methods for both external and internal corrosion which may produce local reductions in wall thickness, such as single pits, multiple pits or general corrosion over a large area. The B31G criterion for prediction of burst pressure of corroded pipe has been found to be overly conservative and ambiguous in many situations. A multi-level assessment procedure is proposed which would reduce the degree of conservatism in the assessment, increase accuracy in the evaluation procedure, and admit high resolution inspection tool data. A two-criterion approach was found to be successful in predicting plastic collapse of pipe with single and multiple corrosion pits, and complex-shaped corrosion, and is proposed for the highest level of assessment. A simplified technique, which aims at producing a suitable stress field for the lower bound theorem of limit analysis at the current yield locus, is proposed as a transition from an empirical to a nonlinear assessment of corroded pipe. The concept of a modified elastic modulus was incorporated in an elastic finite element analysis as a simplified nonlinear
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Citation Formats
Chouchaoui, B.
Evaluating the remaining strength of corroded pipelines.
Canada: N. p.,
1993.
Web.
Chouchaoui, B.
Evaluating the remaining strength of corroded pipelines.
Canada.
Chouchaoui, B.
1993.
"Evaluating the remaining strength of corroded pipelines."
Canada.
@misc{etde_7193921,
title = {Evaluating the remaining strength of corroded pipelines}
author = {Chouchaoui, B}
abstractNote = {Hydrocarbons are mainly transported by undersea or underground pipelines. Metal loss due to corrosion is one of the most common situations leading to pipeline loss of integrity. There are various methods for both external and internal corrosion which may produce local reductions in wall thickness, such as single pits, multiple pits or general corrosion over a large area. The B31G criterion for prediction of burst pressure of corroded pipe has been found to be overly conservative and ambiguous in many situations. A multi-level assessment procedure is proposed which would reduce the degree of conservatism in the assessment, increase accuracy in the evaluation procedure, and admit high resolution inspection tool data. A two-criterion approach was found to be successful in predicting plastic collapse of pipe with single and multiple corrosion pits, and complex-shaped corrosion, and is proposed for the highest level of assessment. A simplified technique, which aims at producing a suitable stress field for the lower bound theorem of limit analysis at the current yield locus, is proposed as a transition from an empirical to a nonlinear assessment of corroded pipe. The concept of a modified elastic modulus was incorporated in an elastic finite element analysis as a simplified nonlinear analysis. 145 refs., 146 figs., 35 tabs.}
place = {Canada}
year = {1993}
month = {Jan}
}
title = {Evaluating the remaining strength of corroded pipelines}
author = {Chouchaoui, B}
abstractNote = {Hydrocarbons are mainly transported by undersea or underground pipelines. Metal loss due to corrosion is one of the most common situations leading to pipeline loss of integrity. There are various methods for both external and internal corrosion which may produce local reductions in wall thickness, such as single pits, multiple pits or general corrosion over a large area. The B31G criterion for prediction of burst pressure of corroded pipe has been found to be overly conservative and ambiguous in many situations. A multi-level assessment procedure is proposed which would reduce the degree of conservatism in the assessment, increase accuracy in the evaluation procedure, and admit high resolution inspection tool data. A two-criterion approach was found to be successful in predicting plastic collapse of pipe with single and multiple corrosion pits, and complex-shaped corrosion, and is proposed for the highest level of assessment. A simplified technique, which aims at producing a suitable stress field for the lower bound theorem of limit analysis at the current yield locus, is proposed as a transition from an empirical to a nonlinear assessment of corroded pipe. The concept of a modified elastic modulus was incorporated in an elastic finite element analysis as a simplified nonlinear analysis. 145 refs., 146 figs., 35 tabs.}
place = {Canada}
year = {1993}
month = {Jan}
}