Analysis of the international and domestic computing dependencies for the calculation of the head loss in pipelines made of polymer materials

Summary

The computing dependencies regulated by the domestic and international standards for the hydraulic calculation of pressure pipes made of polymer materials are considered. The design values of hydraulic characteristics of 600 mm diameter pressure polyethylene pipes obtained at a test installation (600 mm diameter pipe lined with polyethylene, 35.04 m section length) were compared. The comparative analysis of the computing dependencies used both in Russia and abroad for calculating the head loss in the pipes made of polymer materials was carried out. The priority sequence of using the international and domestic dependencies for hydraulic calculations of pipelines made of polymer materials is recommended.

Key words

pipeline , polymeric materials , hydraulic design , pressure losses , calculation formulae , analysis of computing dependencies

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UDC 628.144:532.542:691.175

Averkeyev I. A., Gimazieva D. R.

Analysis of methods of hydraulic calculation of pressure pipelines made of polymer materials

Summary

The analysis of the most pressing for today methods of hydraulic calculations used in domestic design of pressure pipeline systems made of polymer materials was carried out. The methods of hydraulic calculation of pressure pipes were considered on the basis of: pipe friction number formula for hydraulically smooth pipes suggested by F. A. Shevelev; Kolbruk formula (widely used overseas); formula suggested by A. Ia. Dobromyslov. The analysis of the methods was carried out in relation to the applicability and validity of the results of the hydraulic calculations of pressure pipelines. The aim of the analysis was to assist the designer in choosing the most comfortable method of hydraulic calculations of pressure pipes made of polymer materials.

Key words

polymeric materials , hydraulic design , pressure pipeline , calculation method , validity of calculation method

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UDC 628.147.2:504.058

Granovsky A. V., Dottuev A. I.

Earthquake Resistance of Outer Utilities on the Basis of Polytron-ProКan Pipelines

Summary

Results of experimental tests on a shake table with a view to evaluate the earthquake resistance of pipelines of various diameters used as outer utilities are presented. By results of dynamic tests the behaviour of the pipeline made of polypropylene pipes with a two-layer profiled wall of Polytron-ProКan brand has been established at resonance and also over the frequency-amplitude range of 7–9 points.

Key words:

seismic action , pipeline , polymeric materials , corrugated two-layer pipes

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UDC 621.644:621.643.2-034.13

Prodous O. A., Dzhanbekov B. A.

Pipes with polyurethane coating for the construction of the Teberda group water main

Summary

The problem of drinking water deficiency in the southern regions of Russia (at the North Caucasus) can be solved by the construction of a large-diameter and long water main for water transportation from the artesian sources located in the Karachay-Cherkessia Republic. The analysis of the advanced efficient durable polymer materials for pressure pipelines having the high hydraulic potential and operating in the zone of extreme seismicity was carried out. The economic efficiency of using ductile iron pipes with polyurethane inner coating in the construction of the Teberda group large-diameter water main is shown. The specific head losses along the length of a 500 mm water main are cited that are 2.5 times less than the specific head losses in pressure polyethylene pipes of the same diameter.

Key words

pipeline , polymeric materials , pressure losses , drinking water deficiency , pump energy consumption

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