TECHNICAL MANUAL - Sharq.biz

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welding errorsThe following pictures report several jointings performed without respecting thewelding instructions defined by the standards UNI 10520 and UNI 10521.The experience developed in the years on trench sites, in the testing laboratoriesand at the Technical Training Center allowed the characterization and filing of themost common welding error types:irregular welding beadbuttfusion off-centering of the elementsuncomplete insertion of the pipeswrong centering of the pipesoff-centering of the pipe on the left sideoff-centering of the pipe on the left sideand wrong welding parameters setting60
uncorrect pipe cutuncorrect pipe cutand uncomplete insertionirregular scraping(carried out with unproper tool)lack of scrapingpipe boring before coolingwrong welding parameters setting61
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The content of this manual is updat
Page 7 and 8:
tablesrelationship between SDR, ser
Page 9:
pipe/fitting dimensionsUNI EN 12201
Page 12: training courseswelders classificat
Page 15 and 16: standard referencesThe references g
Page 17 and 18: CIGTransport and supply of gas - Pi
Page 19 and 20: jointing systemsThe most important
Page 21 and 22: transition systemsThe metal/PE fitt
Page 23 and 24: uttfusion jointing“Welding with h
Page 25 and 26: external nominal diameter[d n ]cont
Page 27 and 28: welding cycle at single pressureY(P
Page 30: phase 3removal of the heating plate
Page 33 and 34: synoptic tablephases and parameters
Page 35 and 36: phase 1hauling and pre-heatingPosit
Page 37 and 38: synoptic tablephases and parameters
Page 39: automatic buttfusion machinesThe st
Page 42 and 43: Visually check that the pipes are f
Page 44 and 45: cleaningJust before the jointing wi
Page 46 and 47: weldingConnect the plugs of the con
Page 48 and 49: scrapingClean the pipe from dust, d
Page 50 and 51: coolingThe cooling time of the join
Page 52 and 53: automatic reading systemsof the wel
Page 54 and 55: polyvalent ef unitThe electrofusion
Page 56 and 57: ancillary equipmentaligning clamp
Page 59 and 60: inspection of weldedjointingsEither
Page 61: electrofusion welding UNI 10521visu
Page 65 and 66: transport and storageThe guidelines
Page 67: uttfusion fittingsThese items are g
Page 70 and 71: The laying of polyethylene pipes ou
Page 72 and 73: water pipelinesThe reference standa
Page 74 and 75: gas and water pipeline layingThe in
Page 76 and 77: signalsIt is necessary to lay over
Page 78 and 79: gas installation for domestic usesu
Page 80 and 81: testing procedureThe testing proced
Page 82: Edition September 2010
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