PROVIDING RELIABILITY OF TRUNK GAS PIPELINES OPERATION ON THE BASIS OF IN-LINE INSPECTION RESULTS

This Paper deals with the topical problem of providing safety of trunk gas pipelines on the basis of in-line inspection results, and consists of the following Sections: Pipeline Failures and Diagnostics In this Section data are cited on the length and failure incidence of Russia's trunk gas pipelines. It presents Russian highly efficient technologies and equipment for ILI to ensure such technological operations as inner pipe-surface cleaning, caliper logging, defect detection by MFL and TFI tools, and defect measurement. It also cites the scopes of diagnostics carried out in Russia and abroad. Diagnostics Results The Section contains generalization of the experience and presents results of the diagnostics of above 100 thousand km of trunk gas pipelines. Cited here are results of the statistical data processing of detected defect parameters as well as rated assessments of defects danger. The high potential danger is shown of stress-corrosion damages due to the high crack growth rates, as well as the possibilities of applying EMA technologies to detect and identify cracks at an early stage of thei