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Spiral pipes BIOTOP SVT with a hollow wall of a spiral profile made of polyethylene, designed for underground networks of domestic sewage and drainage systems (non-pressure and storm sewers, drains), as well as the removal of other liquid and gaseous substances, to which the pipe material is chemically resistant at maximum temperature permanent drains of 40 °C and short-term drains with temperatures up to 80 °C. BIOTOP SVT pipes are made by continuous auger extrusion of a hollow profile pipe’s wall followed by winding up and extrusion welding of it on a cylindrical mandrel. BIOTOP SVT are designed for underground networks of domestic sewage and wastewater systems. The service life of the piping system using BIOTOP SVT pipes is at least 50 years. Any design and construction company can contact our constructor department to receive robustness calculations of loads, calculations of the plate against ascent, selection of pumping equipment and many other technical services.