Water-condensation rate critical in predicting, preventing TLC in wet-gas lines

07/10/2000
TOP-OF-LINE CORROSION-1 TLC appears at a field joint without concrete coating (Fig. 1).Click here to enlarge imageThis first of two articles on top-of-line (TLC) pipeline corrosion demonstrates that TLC in wet-gas pipelines correlates with the water-condensation rate (WCR).A model to calculate WCR along the pipe profile and evaluate the risk of TLC is presented.The conclusion next week indicates how corrosion-prediction models can be updated and presents remedial actions for the preventing TLC.Research reported on here evaluated the risk of TLC rate for gas lines from three different fields and obtained a good agreement between inspection pigging-UT inspection records and evaluated WCRs....
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