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UDC 628.1/.2:621.644.075

Prodous O. A., Terekhov L. D.

Selection of polyethylene pipe grades for trenchless rehabilitation of water and wastewater pipelines

Summary

In the world practice different methods of trenchless rehabilitation of water and wastewater pipes are used. Selecting a method of trenchless rehabilitation is recommended solely after having compared the cost of the set of process equipment, its payback period and hydraulic characteristics of the pipeline before and after the rehabilitation. A method of substantiating the selection of polyethy­lene pipe grades for trenchless rehabilitation of water and wastewater pipelines is presented. The method of selecting the diameter of polyethylene pipes is as follows: for a certain pipe material the inner diameters of the pipeline under rehabilitation and pulled through polyethylene pipe are determined according to the existing standards; the ratio between the inner diameter of the pipeline of the section under rehabilitation and the outer diameter of the polyethylene pipe pulled through (by any method) should differ by only one standard size by grades; for comparison the hydraulic characteristics of the pipeline before and after the trenchless rehabilitation are determined by tables (handbooks); the cost of the process equipment, payback period and the hydraulic characteristics of the pipeline before and after the rehabilitation are compared. Thereafter the diameter of the pulled through polyethylene pipes is accepted. A comparative analysis of the hydraulic parameters for two methods of trenchless rehabilitation with the use of 160–400 mm diameter polyethylene pipes was carried out. The results of comparing the hydraulic characteristics of a pipeline in the process of rehabilitation with and without host pipe destruction are presented.

Key words

water supply , pipeline , trenchless repair , sewerage , polyethylene pipes , pressure losses

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REFERENCES

1. Prodous O. A. Rekomendatsii po vyboru sposoba i podboru tekhnologicheskogo oborudovaniia dlia bestransheinogo remonta inzhenernykh setei [Recommendations on the method and selection of the process equipment for trenchless rehabilitation of uti­lity networks. St. Petersburg, NII AKKh imeni K. D. Pamfilova Publ., 2004, 51 p.].
2. Prodous O. A. [Trenchless rehabilitation of utility networks. Specific features of technologies, equipment and material selection]. Abstracts of «Water: Ecology and Technology. ECWATECH–2006» VII International Congress. Moscow, 2006.
3. Prodous O. A. [How does the recognition of the hydraulic potential of a water supply network help?]. Truboprovody i Ekologiia, 2008, no. 2, p. 2. (In Russian).
4. Prodous O. A. Tablitsy dlia gidravlicheskogo rascheta trub napornykh iz polietilena [Tables for hydraulic calculation of pressure polyethylene pipes. St. Petersburg, Gerda Publ., 2011, 240 p.].