Prefabrication

Prefabrication of pipe systems refers to the manufacturing of standardized and factory-made pipe sections in large quantities, which are then assembled during installation on the building site. The fittings and pipe are butt-welded together during prefabrication, after which the prefabricated sections are installed on site using electrofusion.

Prefabrication has the following advantages:
- Saves time during installation
- Reliable butt-welded joints made under factory conditions

The advantages of prefabrication are especially visible in situations when the pipe systems are identical and can be prefabricated in large batches using retaining moulds. Large identical pipe systems typically occur in for instance a hospital or an apartment complex.

Although prefabrication can be done with a variety of materials, the properties of HDPE offer specific advantages as a material for this manner of installation:
- Simpler handling due to the light weight of HDPE. A related advantage is the lower transport costs in cases involving large distances between the factory and installation site.
- Minimal risk of breakage and deformation during transport and handling because HDPE is a flexible, impact-resistant and tough material. It will even survive rough treatment.
- Simple assembly using butt-welding or electrofusion, enabling firm and leak-free welded joints to be made.

Fittings and prefabrication
To facilitate prefabrication the dimensions of all common fittings have internationally standard lengths and diameters. In order to optimise the welding of fittings under an angles, a graduated arc is integrated into the fittings. The spigot of most fittings can be shortened and still be butt-welded on a standard butt-welding machine, which fittings and their dimension are listed in our product overview.