In Denmark, many water utilities are using PE pipes for almost all of their new installations, and AVK gate valves with PE pipe ends are an integrated part of fully welded distribution networks covering many supply areas.
Advantages of PE pipes
"PE pipes are easier to handle and in general come in a higher quality than e.g. cast iron and PVC pipes. You do not need to handle large bolts and there are no mechanical joints to give rise to leakage", representatives from the two utilities say.
In urban areas, pipes and valves are assembled using electro welding. On longer distances, butt welding allows for the pipes to be welded above ground rather than in the trench, for easy installation.
New fittings of fully welded PE pipe systems
Photos above represent two projects at the water utilities involving new fittings of PE pipes and valves with PE pipe ends.In Aalborg a new supply line was established as an emergency backup for a supply area, where the consumers to this point in time could only be supplied from one location. The emergency backup ensures that the consumers will still be supplied with clean water in case of e.g. contamination at their main supply.
The photos from Aarhus are associated to the establishment of a completely new water supply, a 5.5 km main line (450 mm) and related main lines for raw water to be cleaned at the water plant and for distribution (400 mm). Related to the formation of the new water supply, drainage was established in the nearby park. The water utility had to relocate some pipes due to the placement of the drainage, and loops of PE pipe were led below the drainage lakes and connected to the existing non-PE pipes.
Unique features of AVK gate valves with PE pipe ends
- Available for outside pipe diameters up to 630 mm (for water)
- Valve/pipe connection has no bolts and is stronger than the PE pipe itself
- Possibility to obtain pipe approval that covers the entire network including valves, since all standard PE pipes can be mounted on the valve
- Extra-long pipe ends that leave room for an additional weld
- Renowned AVK valve design