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UDC 628.144:532.542

Prodous O. A.

Predicting head loss in pipelines made  of different polymer materials

Summary

The availability of manufacturing tolerances for the outer diameter and wall thickness in the operating standards for pipes made of different polymer materials results in changes in the values of the calculated inner diameter, flow velocity and friction loss. The demand for the calculation of head loss for the subsequent count in the operation of pipelines made of different polymer materials is shown. It is proposed to set regulated maximum values of pipe wall roughness and include them into the operating standards for pipes: to develop the limits of the altitudinal roughness parameter Ra; to develop the method of in-process monitoring of the roughness parameter Ra during pipe manufacture similar to GOST 12586.0-83 «Reinforced-concrete pressure vibrohydromoulded pipes». Based on this method the manufacturer of the pipes will have to enter the numerical values of roughness parameter Ra into the passport of the pipe lot so that it will be possible to predict friction losses for the length of the designed pipeline; to recommend an instrument for in-process monitoring of the inner wall roughness parameter of pipes made of polymer materials upon the substantiation of the choice; to prepare the method of in-process monitoring of the wall roughness parameter of pipes made of polymer materials for including it into the requirements of GOST 18599-2001, Р 52134-2003, Р 54560-2011.

Key words

pressure pipeline , pressure losses , polymer pipes , roughness , parameter monitoring method

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REFERENCES

1. Prodous O. A. Tablitsy dlya gidravlicheskogo rascheta trub napornykh iz polietilena [Tables for hydraulic calculation of pressure polyethylene pipes. Saint-Petersburg, Svoe Izdatel’stvo Publ., 2017, 240 p.].
2. Prodous O. A. [Influence of inner diameter of pressure polyethylene pipes on friction losses]. Vodoochistka. Vodopodgotovka. Vodosnabzhenie, 2018, no. 6 (126), pp. 14–19. (In Russian).
3. Prodous O. A., Dobromyslov A. Ia. [Taking into account roughness of plastic pipes]. Energeticheskoe Stroitel’stvo, 1985, no. 6, pp. 72–74. (In Russian).
4. Prodous O. A., Dobromyslov A. Ia., Shashkova I. L. [On the quality of the inner surface of plastic pipes]. Vodosnabzhenie i Sanitarnaia Tekhnika, 1987, no. 5, pp. 6–8. (In Russian).
5. Prodous O. A., Dobromyslov A. Ia. [On the link between equivalent even-grained roughness and parameters of the physical roughness of pipes made of different materials]. Izvestiia Vuzov. Stroitel’stvo i Arkhitektura, 1987, no. 5, pp. 92–96. (In Russian).