Experience On The Survey Repair Methods Of Wear Problem On High Pressure Gas Transmission Pipelines

摘要

Over time pipelines in the field, transporting high-pressuregas, have exhibited severe external wear at support locations,especially near bends, due to expansion/contraction withrespect to climatic conditions.This paper describes on-stream inspection surveytechniques and the subsequent repair/inspection methodscarried out, to ensure that pipeline integrity is maintained. Thefirst gas transmission lines were constructed around 30 yearsago, meeting the code requirements of ASME/ANSI B31.8,with an operating pressure of approximately 1050 psi. In July1998, at one location, a 12” gas transmission line leaked dueto external wear of the pipe at its point contact with atransverse support.This paper also focuses on the significance of designlocation class, field investigation, corrective & preventivemeasures, repair & acceptance methods.