The need for monitoring based on the results of in-tube magnetic testing of main gas pipelines (MPG) is substantiated in this study. An analysis that is performed using the data of in-tube diagnostics of pipelines is the most complete and reliable source of information about the state of a main gas pipeline at the moment of monitoring. Analysis of thin-walled single-seam tubes has shown that safe operation can be maintained by an increase in the frequency of ITNDT (no more than 3 yr between testing) and timely elimination of stresscorrosion flaws if the MGP is constructed of only single-seam thin-walled tubes. The process of corrosion activity on thin-walled double-seam tubes occurs not only near compressor stations, but also along the whole section up to the moment when the frequency of ITNDT increases (no more than 3 yr between testing procedures), and timely repairs will minimize the number of thin-walled double-seam tubes in operating MGPs. Safe operation of an MGP can be achieved only by replacement of thin-walled double- and singleseam tubes with thicker walled shop-insulated tubes (more than 19 mm thick) and by timely ITNDT at 5-yr intervals. NDE with pig flaw detectors with a longitudinal magnetization system is applicated.
Analysis of stress-corrosion flaws in main gas pipelines based on the results of in-tube nondestructive testing
Analyse der Spannungskorrosionsfehler in Hauptgaspipelines auf der Grundlage von Ergebnissen der Innenrohr-ZfP
Russian Journal of Nondestructive Testing ; 45 , 5 ; 317-324
2009
8 Seiten, 12 Bilder, 5 Quellen
Article (Journal)
English
In-tube nondestructive testing of main gas pipelines
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