Application of Device and Comprehensive Finishing Technology that Increase the Bearing Capacity of Gas Transmission System Nodes
Keywords:gas transmission system, pipeline, corrosion-fatigue process, butt weld, finishing arrangement, cleaning, grinding, surface plastic deformation, coating of welds by anticorrosive paste
It is presented that pipelines of gas transmission systems of Armenia are mainly installed in open terrain and operate under conditions of simultaneously influencing factorst, that`s why corrosion-fatigue and plain corrosive processes occur and develop in the joints of welded pipe seams. These phenomena significantly reduce the bearing capacity and service life of pipelines, and in some cases initiate breach of tightness and fatigue failures. To avoid this, the comprehensive finishing technology is proposed to increase the bearing capacity of butt welds. By the use of its particular operations is becoming possible: to remove a surface damage and microcracks; to increase a fatigue resistance by surface plastic deformation of welds and adjacent areas; increased tightness and corrosion resistance of welds by coating them with a special polymer glue. The special movable device has been developed in order to implement the proposed comprehensive finishing technology, this devise is installed and fixed on the weld. The device is equipped in pairs and oppositely with slot-cleaning and plastically deforming rollers operating on friction running-in. An electric drive is installed on the device, transmitting rotation to two round semi-levers pivotally mounted on a large gear wheel, inside which these four rollers are placed. A unit with a brush is installed on one of the semi-levers to clean the weld during its grinding and anticorrosive coating application on the seam surface. The use of this device significantly reduces the execution of manual finishing works on pipelines, increases operational reliability and extends the service life of pipelines.
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