METHOD TO REPAIR METAL PIPELINES WITH DEFECT OF WELDED EDGES DISPLACEMENT BY INSTALLATION OF REPAIR PAD Russian patent published in 2013 - IPC F16L13/04 

FIELD: construction.

SUBSTANCE: method to repair metal pipelines with a defect of welded edges displacement by installation of a repair pad consists in welding of a repair pad onto an edge displaced to the pipeline axis. The installed pad increases the moment of resistance of pipe wall section and creates conditions for symmetrical loading in the zone of defective welded joint. It makes it possible to reduce the value of stress concentration and to increase strength of a welded joint with displacement of welded edges to the level of the defect-free pipeline.

EFFECT: method makes it possible to repair defects of welded edges displacement without draining a pipeline and without interruption in product transportation as inner pressure reduces to a safe level.

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