CALCULATION OF OPERATING MODES FOR HYDROTRANSPORT COMPLEXES WITH MAIN PIPELINES CONSISTING OF POLYETHYLENE AND STEEL PIPE SECTIONS

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Parent Category: Geo-Technical Mechanics, 2013

Category: Geo-Technical Mechanics, 2013, Issue 111

UDC 622.648.01 – 9:621.643.29

Semenenko E.V., D. Sc. (Tech.), Senior Researcher (IGTM of NAS of Ukraine)

Nykyforova N.А., Ph.D. (Tech), Assistant Professor (NМеtАU of МES of Ukraine)

Tatarko L. G., Senior Teacher (USU of Chemical Technology of МES of Ukraine)

Abstract. The paper is devoted to creation of methodical support for hydrotransport system calculations with main pipelines consisting of polyethylene and steel pipe sections, which allows determining not only a slurry discharge, but also acceptable length of polyethylene pipe section, which can stand to given pressure. Purpose of tis paper is to elaborate a procedure for calculating hydrotransport parameters and operating modes of the plant with main pipeline consisted of polyethylene and steel pipes sections.

The concerned calculation procedure of hydraulic gradient and critical velocity of hydrotransportation by polyethylene pipes is an adapted variant of a calculation procedure of hydrotransport parameters for polydisperse materials with particles of different density elaborated by the IGTM scientists. It is the first calculation procedure which takes into account differences in resistance laws for pipes made of various materials as well as availability of inner welts on the weld seams of polymeric pipes. It is offered to calculate operating modes for such hydrotransport plants by solving nonlinear equation set obtained by using of the Bernoulli equation. One of these equations determines a working point of the system and the second determines acceptable length of the polyethylene pipe section. Dependences are offered for calculating hydraulic gradient and critical velocity in steel and polyethylene pipes, which take into account characteristics of slurry, pipeline material and availability of inner welts on the weld seams between polyethylene pipes. With the help of these dependences a calculation method was elaborated for operating modes of hydrotransport systems with main pipelines consisting of polyethylene and steel pipes sections, which is the first which allows determination not only slurry discharge, but also acceptable polymeric pipe section length, which can stand to given permissible pressure. Obtained scientific results allow to ground main pipeline parameters and operating modes for hydrotransport complexes in process of their modernization by using polyethylene pipes for suction pipelines installation in order to rise pressure at the input to the pump as well as for mounting the end sections of pressure pipe in order to decrease total pressure loss.

Keywords: hydrotransport, polyethylene pipes, hydraulic gradient, critical velocity.

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About the authors:

Semenenko Eugeniy Vladimirovich, Doctor of Technical Sciences (D.Sc), Senior Researcher at the Institute of Geotechnical Mechanics, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

NykyforovaNinaAnatoliyevna, Candidate of Technical Sciences, Assistant Professor at the National Metallurgical Academy of Ukraine, State Higher Educational Institution “National Metallurgical Academy of Ukraine” (SHEI “NMetAU”), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Tatarko Larisa Gavrilovna, Senior Teacher of Physics,  State Higher Educational Institution “Ukrainian State University of Chemical Technology” (SHEI “USUCT”), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

 

 

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