TECHNICAL MANUAL - Sharq.biz

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phase 5weldingMaintain the ends into contact with pressure (P 5 + P t ) for a time equal to:t 5= 3 + e n[minutes]where e n is the nominal thickness of the pipe and/or fitting to be welded.A tolerance of (+10%, -0%) is admitted on the t 5 value.P 5 + P tP 5 + P tBphase 6coolingAt the expiring of the time t 5 , the pressure is released to zero and the weldedjoint can be removed from the clamps. The joint must not be stressed until thecomplete cooling at touch, because it is possible the formation of cracks andslackenings in the cut area. The cooling must be carried out naturally, avoid anyquick cooling with water, compressed air and other methods.The cooling time must not be shorter than:t 6= 1,5 × e n[minutes]where e n is the nominal thickness of the pipe and/or fitting to be welded.30
synoptic tablephases and parameters of the welding cycleAT SINGLE PRESSUREphasecontactpressuretime[seconds]notes1hauling andpre-heating0,15 N/mm 2 + P t -Time t 1 which allows to form aring of fused material with width:A=0,5 + (0,1 x e n ) [mm]2 heating ≤ 0,02 N/mm 2 12 x e n the ends into contact with theRelease pressure and maintainheating plate.3removal of theheating plate- < 4 + (0,3 x e n )Remove the heating plateavoiding to damage both ends.4build-up of thewelding pressure0-> 0,15 N/mm 2 + P t 4 + (0,4 x e n )Put into contact the ends avoidingan excessive coming-out ofmelted material.5 welding 0,15 N/mm 2 + P t (3 + e n ) x 60 Maintain the ends into contact.6 cooling - 1,5 x e n x 60The joint cannot be subjected tostresses.N.B. Within the formula, e n shows the nominal thickness of the pipe/fitting31
Page 4 and 5: 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 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 and 62: electrofusion welding UNI 10521visu
Page 63 and 64: uncorrect pipe cutuncorrect pipe cu
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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