8 1 2015 BRG PREMANT district heating pipe PRE Subject to technical changes 6 352 EWELCON S System description The EWELCON S Electro Welding Joint is a member of the EWELCON family It is the ideal match for our tried and tested EWELCON welding joint for the smaller dimension range The shrink on sleeve and the prefabricated heating elements for the EWELCON S electro welding joint are delivered in separate packaging units The shrink on sleeve which is fitted with solar protection foil is pushed onto the casing pipe before welding the inner pipes The heating elements are delivered in handy packaging units which are protected against contamination as appropriate for use on construction sites The heating elements are only placed around the two ends of the plastic casing pipe immediately before welding The weld seam area can easily be cleaned and dried This plays a key part in the high and constant quality of the joint even in difficult and confined installation locations These properties make the EWELCON S system particularly suitable for new installations Repairs and refurbishments on existing pipes are carried out with the EWELCON welding joint using the wraparound method For quality reasons the installation is only carried out by fitters who have acquired the necessary qualifications after thorough training from our training staff The shrink on sleeve in the EWELCON electro welding joint consists of bimodal PE HD This ensures optimal long term properties The thermal conductor a meanderform copper wire is embedded in a PE HD carrier strip Each heating element set is fitted with a temperature sensor The heating elements are fixed onto the prepared casing pipe ends they adapt to the component tolerances The special design in the area of the connecting ends ensures constant welding conditions over the entire pipe circumference Following the usual on site method the shrink sleeve is shrunk down onto the casing pipe ends with a gentle propane gas flame the heating elements are optimally chambered as this is done Together with the contact pressure for the weld surfaces the weld bath temperature is the most important requirement for plastic weld seams of high quality This fact is consistently implemented in the EWELCON S system The required contact pressure is reliably applied by the clamping tool specially developed for this purpose The welding process is regulated by a microprocessor controlled welding appliance The temperatures of the weld bath and the thermal conductor are monitored and stored throughout the entire welding process This method ensures that the weld bath temperature is largely independent of disruptive external influences such as the weather and thus comparable from one welding operation to the next The parameters for each welding operation are stored in the welding computer so that they can be read out and documented at a later stage Furthermore every joint produced is subjected to a thorough visual inspection and a tightness test after which it is foamed and the filling and venting bores are sealed with weld plugs

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