FLASH-BUTT WELDING FOR COMPRESSED NATURAL GAS (SNG) TRANSPORTATION AND STORAGE

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    03-Jul-2015

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Flash butt welding (FBW) is the process where the parts to be welded are heated to required temperature by passing of electric current and pressed to each other to form a welded joint FBW is applied for welding steel pipes, rails, and other rolled stocks, parts of light metal alloys, e.g. aluminium-base and titanium-base alloys E.O. Paton Welding Institute proposed to Sea NG, Canada, the inventor of Coselle technology, to use Flash Butt Welding (FBW) for pipe connection

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  • 1. E.O. Paton Electric Welding Institute, Kyiv, Ukraine FLASH-BUTT WELDING FOR COMPRESSED NATURAL GAS (SNG) TRANSPORTATION AND STORAGE Ihor Ziakhor, Ph. D.

2. The Coselle is a unique system, invented in Canada, for Compressed Natural Gas (CNG) transportation and storage in coil of small diameter pipe. A single Coselle carries about 3.0 million standard cubic feet (mmscf) of natural gas. Numerous Coselles with CNG are contained within the specially-designed ship. 3. Potential markets for CNG concept What is CNG / LNG 4. DesignandcapacityofCosellesystem Eachcoselleconsistsof about17,350metersof 168mmdiameterpipeof highstrengthX70steel ThesizeofaCosellemay rangefrom15to20 metersindiameterand 2.5to4.5metersin height,anditmayweigh about550tones. FullyFramedCoselle (20mexteriorDiameter) 5. Oneofthemainproblemsistomanufacture coiledpipestructuresusingthemost appropriatetechnology Thefirstproblemis reliablemethodof singleX70steelpipes connection(welding) intolongpipesection Thesecondproblem islongpipesection windingwithminimal ovalization 1-toweld 2-towind 6. InnovativeAspect E.O.PatonWeldingInstitute proposedtoSeaNG,Canada, theinventorofCoselletechnology, touseFlashButtWelding(FBW) forpipeconnection ExperimentalevaluationofFBW appliedtocoiledpipestructures manufacturehasshowntechnical advantagesoverstandardwelding methods 7. Whats the problem Flash butt welding (FBW) is the process where the parts to be welded are heated to required temperature by passing of electric current and pressed to each other to form a welded joint FBW is applied for welding steel pipes, rails, and other rolled stocks, parts of light metal alloys, e.g. aluminium-base and titanium-base alloys However, FBW performed with the available equipment is limited in capabilities due to the level of technical characteristics of existing welding machines, mainly electronic and hydraulic control systems. 8. Development of a new generation of the FBW technology and equipment to address the following tasks: raising efficiency of the process through building fast-response actuating mechanisms and computerized system to control the welding process; raising productivity and ensuring a specified level of mechanical properties of welded joints through intensification of the thermal-deformation cycle of welding; computerization of inspection and diagnostics of quality of welded joints; improving environmental characteristics of the process (substantial decrease in harmful emissions into the atmosphere) 9. Stage of Development: The experimental equipment prototype and several batches of welded pipes are available. Modernized K584M machine during welding of pipes for Coselle manufacture Welded pipe specimen after bending 10. Main Advantages of Flash-Butt Welding (FBW) applied to manufacturing coselles. This solution will allow to strengthen mechanical properties of welded joints, in particular cyclic weld strength, to increase productivity of winding pipes, to enhance safety and reliability of Coselle carries Plots of fatigue resistance of welded joints in X70 (1) and X56 (2) pipes 11. Contact Details Dr. Valerij Kryvenko Phone: (380 044 ) 524-7304; Fax: (380 044 ) 227-6329; 271-2328 E-mail: elweld@viaduk.net, zyakhor@paton.kiev.ua E.O. Paton Electric Welding Institute, Kyiv Address: 03680, Ukraine, Kyiv, 11, Bozhenko str.

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