«Proceedings of Gubkin University»

EFFECT OF HEAT REMOVAL INTO PUMPED PRODUCT ON PIPE WALL TEMPERATURE GRADIENT DURING THE WELDING REPAIR OF CORRODED PINHOLES

UDC: 621.644
DOI: -

Authors:

¹ Gubkin Russian State University of Oil and Gas (National Research University, Leninskiy prospect, 65, 119991, Moscow, Russian Federation
² Pipeline Transport Institute, Sevastopol Avenue, 47а, 117186, Moscow, Russian Federation

Keywords: oil trunk pipelines, repair method, local corrosion, thermal processes, running energy

Annotation:

Currently, welding is the most progressive method of repairing local corrosion damage on the outer surface of the linear part of the mains. However, heating of the pipe wall by welding, which occurs due to the action of a concentrated source of heat (welding arc) softens the metal of the repaired surface, which creates the risk of an emergency. The authors present the results of the studies of thermal processes occurring in the pipe wall repaired by welding. The authors have identified the zone of guaranteed strength properties, providing a reserve for temporary resistance to metal pipe rupture during repair, and also established the relationship between the thickness of the specified area and the amount of running energy and heat removal into the pumped product during repair. A mathematical model describing the polynomial dependence of the thickness of the zone of guaranteed strength properties on the effective thermal power of the welding arc, the speed of its movement and the residual thickness of the pipe wall at the repair site are presented.

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