TECHNICAL MANUAL - Sharq.biz

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emovable systemThe removable system includes all connections with stub end and backingflange, kit antifluage as well as compression fittings (quick release joints).These systems allow to connect different materials (PE, PVC, steel or cast-iron)and also the connection to special products such as valves.stub end and backing flangeThe jointing with stub end, backing flange and gasketis normally used to connect polyethylene pipes withothers of different material, or to access to valvesand branches. It can also be chosen for a temporarilyjointing of two PE pipelines.The stub end must be welded to the PE pipe (indifferentlyusing buttfusion system or with electrofusion) andforms the support base for the flange, normally madeof steel or aluminium. The connection is made by bolts,while the tightness is guaranteed using a flat gasket,placed between the two elements. Its composition issuitable for the carried fluid.kit antifluageThis jointing system similar to the above-mentionedone, is made of a PE stub end and a polypropyleneflange charged with fiber glass; the special designavoids the deformation of the counter-flange andguarantees the joint tightness in the long period.compression fittingThis is also called “quick release joint” or “clamp joint”for its constructive characteristic which consists ofa main body screwed with two bushes. Tightness isguaranteed by the elastomeric gasket compressed bythe mechanical elements.This type of fitting is generally used in low pressurepipeline systems since overpressure or hammering cancompromise the tightness, as well as the ovalization ofthe pipe.18
transition systemsThe metal/PE fittings allow the connection of a polyethylene pipe to otherpipelines, or special fittings of different material.They can be made of:monolithic metal/plastic couplingwith smooth or thread metal part. The polyethylene partis overmoulded on a metallic part suitably prepared,obtaining a fitting guaranteed to axial bursting andinternal pressure tightness.copper/pe couplingwith smooth copper part, designed and manufacturedusing the same method of the monolithic metal/plasticcoupling.Transitionsystemsassembled metal/plastic couplingmanufactured by mechanical assembling of a steel partwith a polyethylene pipe section. The metallic part isinserted in the polyethylene pipe by mechanical forcing.The joint clamping is made with an external nut.metal/plastic thread long couplingis a special application of the monolithic metal/plasticfitting, prolonged and bended at 90° on the steel part.It is normally used for the construction of branchnetworks.19
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: jointing systemsThe most important
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 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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