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Fittings

The TeraPlast fitting range includes: electrofusion fittings, injection moulded fittings for butt welding and PE compression fittings.
Electrofusion fittings Electrofusion fittings are made by injection moulding and contain a calibrated electrical resistance inside their wall. Welding with such fittings has become increasingly used, thanks to an extremely simple and fast procedure and the superior quality of the joint. In general, this procedure is widely used for gas distribution networks. In the case of this joint, the energy that is generated in the coils of the electrofusion fitting heats the material on the inner surface of the fitting and the outer surface of the pipe, after it has been introduced into the fitting. As a result of the increasing temperature and pressure between the two surfaces, the two masses of molten material flow together leading to their fusion. Each of the fusion area is provided with an indicator made in the fitting wall which is pushed outwards during the fusion process. This is also the first visual proof that the welding process has taken place. See also HDPE water pressure pipes and fittings.

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In the case of welding with electrofusion fittings, the parameters used are temperature and time. The parameters are written on the product label and read automatically by the electrofusion device. Although it is an even simpler procedure than butt welding, several important factors must considered, including:

  • correct cutting of the pipe ends and marking on them the insertion length in the fitting;
  • scraping the outer surfaces of the elements to be joined to remove the oxidized surface layer;
  • cleaning the joint surfaces of foreign bodies and especially lubricants, using special solvents;
  • cooling must be done naturally according to the time marked on the fitting label.

Electrofusion welding uses automatic welding machines with barcode reader, and the realization of these welds requires well-qualified personnel.

Injection moulded fittings for butt welding

Joining with butt fittings is the most common permanent joint technology used. Injection moulded fittings for butt welding depend on the base material of the pipe (fittings) and the standard dimensional ratio (SDR), and are made available by the manufacturers of welding equipment.  

The principle of this method is based on the phenomenon of fusion. Basically, this involved heating the surfaces to be joined for a certain period of time. Then, the two surfaces are pressed onto each other at a set pressure and for a well-defined period of time, so that the molten material fuses to form a single structure. This phase is followed by a cooling phase.

Welding parameters are therefore time, pressure and temperature..

Injection moulded fittings for butt welding depend on the base material of the pipe (fittings) and the standard dimensional ratio (SDR), and are made available by the manufacturers of welding equipment. See also HDPE water pressure pipes and fittings.

PE compression fittings

Compression fittings offered by TeraPlast are manufactured within the dimensional range 20 - 110mm, with a relatively wide field of use.

The most common field of use of compression fittings is the water network repairs. Their use is possible even for indoor installations and technological pipes. They are most often used in the area between the network connection and the building.

We recommend paying special attention to the fittings used to make the connections (see the presentation of the components of this range).

Compression fitting is the simplest of the polyethylene pipe joining technologies. This technique allows the joining of hundreds of meters of pipe network with an increased and very economical efficiency, especially the one delivered in coils.

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