The results of in-tube magnetic nondestructive testing performed on a six-branch corridor of gas main pipelines are given. The comparative analysis of the results of three inspections conducted for the period of 2000-2009 is performed. The propagation of stress-corrosion flaws proceeds in the system of gas pipelines from northeast to southwest and is associated with changes in the climatic and geographic conditions of their installation. The inspections following the first in-tube inspection and stress-corrosion flaw remedial works that were performed on the basis of the results still revealed a large number of small-depth stress-corrosion flaws and the interval of their propagation along a section increased. This means that the work on remedying detected flaws is not sufficient to arrest the active stress-corrosion process. As shown by in-tube inspections, the factor of an increased pressure on the first 30.0 % of the length of a section primarily affects thin-wall double-weld pipes. The longevity of main gas pipelines in the zones with an active stress-corrosion process can be increased only by replacing thin-wall double-weld pipes with preinsulated pipes with thicker walls. The operational safety of gas pipelines must also be provided by performing timely in-tube inspections.
Monitoring of stress-corrosion flaws in an extensive multibranch system of gas main pipelines using the results of repeated in-tube nondestructive testing
Überwachung von Spannungskorrosionsfehlern in einem Mehrzweigsystem von Gas-Hauptleitungen durch die Ergebnisse wiederholter zerstörungsfreier Prüfung im Rohr
Russian Journal of Nondestructive Testing ; 46 , 12 ; 892-897
2010
6 Seiten, 6 Bilder, 5 Quellen
Article (Journal)
English
In-tube nondestructive testing of main gas pipelines
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