pipes for street sewerage systems
PEHD polyethylene spiral pipes
PEHD polyethylene spiral pipes represent a high-quality, practical and functional method of collecting and disposing of used waters. It is also a safe method and an economical one, over a long-term period of exploitation. PEHD spiral pipes are simply the best choice from the aspect of caring for the health of the users and our environment.
Owing to the cutting-edge extrusion technology, polyethylene spiral pipes are both lighter and stronger than the smooth PVC pipes. Consequently, they require much less effort in transportation and installation of pipelines, thus saving time and money for the investor.
PEHD spiral pipes are capable of withstanding higher pressure than the smooth PVC pipes, mostly owing to their exceptional elasticity and high degree of ring rigidness. There are several methods that can be used in joining this type of pipes:
- extrusion welding of pipes from the inside or from the outside (diameters in the range of Ø800 mm to Ø1200mm),
- heat-shrinking foil (diameters in the range of Ø300 mm to Ø1200).
Each of the applied joining methods guarantees simple and economical installation and maintenance, The outer wall of the pipe is extruded in a spiral, while the inner wall remains smooth, thus preventing accumulation of residue even after a long period of use. High-pressure washout is possible owing to the inner qualities of polyethylene and the pipe design. The pipes are produced in compliance with the EN ISO 9969, DIN 16961 and EN 13476 standards for pressures of SN4 (4KN/m2) and SN8 (8KN/m2), with the inner diameter in the range from Ø300 mm to Ø1200mm and in lengths ranging from 6m to 12 m.
PE spiral pipes have very good hydraulic features, owing to their smooth inner surface, characterised by a low friction coefficient. The pipes are resistant to abrasion, aggressive waste waters, chemical impacts and are also highly resistant to major mechanical impacts such as land shifting.
The pipelines that are in compliance with the 13476 standard are corrosion-resistant in contact with water within a wide scale of pH values, including household waste waters, rainfall, surface and underground accumulations. If the pipelines that are built to meet these standards are to be used to collect and channel waters with a certain content of chemical pollution, such as industrial waste waters, then other factors must also be taken into consideration, such as temperature resistance and resistance to chemicals.