UDC 621.644.073:691.175.5/.8
DOI 10.35776/VST.2024.03.05

Averkeyev I. A.

Tools for accelerating the design and calculation processes
of polymer pipeline systems

Summary

The latest developments made by POLYPLASTIC Group for the agile design, calculation and selection of polymer pipes and structures for water supply and sewer networks are considered. Among them are albums of standard design solutions that present documents containing multiple-use ready-made standard design solutions that the designer can include in the design documentation without significant changes. New mobile applications are presented that simplify the calculation and design of polymer pipeline systems providing for quick selection of pipes and acquisition of the solutions required for the project development.

Key words

hydraulic design , polymer pipes , polymer tanks , design solutions , strength calculation , mobile applications

DOI 10.35776/MNP.2019.12.05

UDC 628.144:532.542

Averkeyev I. A.

On special features of determining the coefficient
of equivalent polymer pipe roughness
(to be discussed)

Summary

The criteria of estimating the condition of the inner surface of water and wastewater pipelines are considered and appraised. In particular, the feasibility of using equivalent roughness Кэ coefficient as such a criterion is substantiated. Two main methods of determining Кэ parameter are presented and described: with the help of hydraulic experiments with subsequent processing of the results by Prandtl and Colebrook–White equations; direct measurement by a proficorder of the arithmetic mean deviation of the profile of the inner surface of the pipe from the midline Ra with the subsequent conversion to Кэ using the empirical dependence obtained by A. Ia. Dobromyslov. An assessment of the reliability of the results obtained by these methods is given. The feasibility of developing a standard regulating the procedure of determining the parameter Кэ and the mandatory in-process monitoring of it are considered.

Key words

hydraulic design , water and wastewater systems , polymer pipes , coefficient of pipe inner surface roughness

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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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UDC 628.144:532.542

Prodous O. A., Vasil'eva M. A.

Simplified form of the normative dependence for hydraulic calculation  of pipelines made of polymer materials (to be discussed)

Summary

Hydraulic calculation of pipelines (pipes) made of polymeric materials is regulated by the acting regulatory documents (SP 40-102-2000). In the aggregate a method (sequence) of hydraulic calculation of pipelines made of polymeric materials with the use of a simplified form of the normative dependence for determining hydraulic resistance coefficient  is proposed. The calculation method is of practical interest because it is confined to the determination of three values included into the normative calculation dependence for the subsequent determination of head losses along the pipeline length. The hydraulic calculation method includes new parameters: hydraulic potential of a pipeline, effective fluid flow rate, effective roughness of the inside pipe surface, effective pipe diameter. These parameters and the Calculation Method have been included into the 3rd edition of the complemented material of Reference book «Tables for hydraulic calculation of pressure polyethylene pipes» (2017). The simplified form of the normative dependence and the method of making hydraulic calculations of pipelines made of polymeric materials can be considered to be included into the revised version of SP 40102-2000.

Key words

hydraulic design , hydraulic resistance , calculation method , polymer pipes , hydraulic roughness