June 15, 2018
A common technique used in this application is ‘hot tapping’, which facilitates the creation of connections within existing pressurised vessels, pipelines and networks without the need to empty any of these pressurised systems. In-service welding is also commonly used during pipe maintenance procedures, including installing sleeves to repair damaged sections within pipelines. A thorough understanding of the factors that affect welding onto in-service pipelines helps avoid pipeline shutdowns and interruptions of service, thereby bolstering both economic and environmental benefits for operators and welders alike. Moreover, repairs can be undertaken efficiently, effectively and with full confidence. According to Alistair Forbes, Weld Australia Technology Operations Manager, “The advantages of in-service welding are significant and wide-reaching, particularly in the gas & oil industries, where the process can be used to avoid costly shutdowns and service interruptions and maintain continuity of supply to customers. “In comparison, in situations where in-service welding is impossible, sections of the pipeline undergoing repair or replacement must be sealed and degassed before welding can commence, and must then be repurged once welding is complete. This complicated…