METHOD FOR REPARING GAS PIPELINES WITH STRESS-COROSION CRACKS

FIELD: technological processes. ^ SUBSTANCE: after preliminary cleaning of defective part of surface of pipe by an abrasive wheel, the edges of the cracks are determined using penetrant flaw detection method and the defective part is then melted by an unsmeltable tungsten electrode. The process of m...

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Hauptverfasser:	SIVOKON' VIKTOR NIKOLAEVICH, BARANOV NIKOLAJ ANATOL'EVICH, EHFROS SERGEJ DAVIDOVICH, SIDORENKO GENNADIJ STANISLAVOVICH, ISTOMIN ALEKSANDR GEORGIEVICH
Format:	Patent
Sprache:	eng ; rus
Schlagworte:	BLASTING CLADDING OR PLATING BY SOLDERING OR WELDING COMBINED OPERATIONS CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING JOINTS OR FITTINGS FOR PIPES LIGHTING MACHINE TOOLS MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING METAL-WORKING NOT OTHERWISE PROVIDED FOR OTHER WORKING OF METAL PERFORMING OPERATIONS PIPES SOLDERING OR UNSOLDERING SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL TRANSPORTING UNIVERSAL MACHINE TOOLS WEAPONS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	FIELD: technological processes. ^ SUBSTANCE: after preliminary cleaning of defective part of surface of pipe by an abrasive wheel, the edges of the cracks are determined using penetrant flaw detection method and the defective part is then melted by an unsmeltable tungsten electrode. The process of melting starts and ends 10-15 mm from the beginning of the crack and after its end with formation of a depression with fused edges. The obtained depression filled along its whole length by an argonarc method with a filler wire. The surface is then cleaned, flush with the main metal and quality is controlled using ultrasonic flaw detection. Subsequent hardening is carried out using ultrasound pulse processing of the cleaned surface. The method reduces labour intensiveness of the repairing pipes which are in use and with defects in form of stress-corrosion cracks. ^ EFFECT: increased longevity of gas pipelines. ^ 4 dwg, 1 ex