Tag:pressure

№3|2010

POWER SAVING

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UDC 628.12:62-531.3

KARGIN S. A.

Analysis of Electric Power Losses in the Course of Operation of a Group of Pumps Equipped with Adjustable Drive

Summary

Calculations of the power losses in pump units with aggregates operating simultaneously, one of them is adjustable, are presented. The main advantage of a control scheme with one adjustable pump is a relatively low cost of an apparatus part. But additional power losses connected with reduction of rotation frequency of a pump impeller of the adjustable pump in the course of operation of unregulated pumps under conditions of maximum output are unavoidable. Calculations of these losses made with the use of vector diagrams of hydraulic capacity of pumps make it possible to develop a structure of a power efficient pumping unut characterized by acceptable cost of equipment and minimal power expenditures to maintain the preset pressure in a pressure line.

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№12|2014

POWER RESOURCES CONSERVATION

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UDC 628.147.2

Karmazinov F. V., Melnik E. A., Ipatko M. N., Il'in Iu. A., IGNATCHIK V. S., Ignatchik S. Iu.

The method of evaluating the economic efficiency of water supply systems with pumping stations equipped with tanks

Summary

A method of evaluating the economic efficiency of the water supply systems with pumping stations equipped with tanks is presented that provides for optimizing at the design stage water conveying systems in remote areas. These systems are characterized by: low energy efficiency because of the pressure loss during water discharge and low network reliability during bypass operation caused by pressure fluctuation. The method takes into account the specific features of simultaneous operation of two subsystems: pipeline and valving subsystem and booster pumping subsystem. The selection of net discounted flow rate over the life cycle as a uniform optimization criterion for all the subsystems is substantiated. It is stated that the economic and energy efficiency of the investment projects of upgrading water conveying systems is a function of the actual inlet pressure in the supply pipelines and depends on the engineering measures aimed to improve it. These measures include the use of valves for downstream pressure control, mini-hydropower units and auxiliary low head pumping stations. By the example of Parnas booster pumping station in St. Petersburg it is shown that the use of the developed method allows improving the reliability coefficients of the water supply system to P(t) > 0.95 with simultaneous 17% reduction of the net discounted flow rate over the life cycle. In this case depending on the actual inlet water pressure in the supply pipeline the energy consumption of a pumping station is reduced by 22–60%.

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№4|2010

PROBLEMS, PERSPECTIVES

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UDC 696.117.62-192

Svintsov A. P., MUKARZEL S. A., SUCHENKO V. N., GLEBOV E. A.

Design Technique for Dimensioning a Pass Hole of the Flat Valve of a Faucet Head

Summary

A new design technique is presented for calculating the area and geometric parameters of a pass hole of the stop valve with a smoothly changing shape of cross-section. The proposed technique allows designing of flat valves for sanitary fittings of various purposes.

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№9|2010

POTABLE WATER SUPPLY

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UDC 628.15:62-531.3.004.18

LEZNOV B. S., Vorobiev S. V.

Assessment of Water Saving When Using the Regulated Electric Drive in Pumping Plants of Water Supply Systems

Summary

Methods of the assessment of water saving developed by specialists of the Yagorba Ltd. and the automation laboratory of the NII VODGEO PC are described. The assessment of water saving when using a regulated drive for various variants of pumping plants operation in the water supply systems can be made with the help of these methods. Results of the calculation are close sufficiently to the results of operational supervision on real objects. This procedure can be used for estimation of reduction of wastewater disposal into the sewerage owing to the reduction of non-productive discharges in a water delivery system. The example of calculation of predicted water saving for a pump installation with one and several units is presented.

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№4|2017

WATER DISTRIBUTION NETWORKS

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UDC 628.144:532.542

Baranchikova N. I., Yepifanov S. P., Zorkaltsev V. I., Kurtin A. V., Obuzdin S. Iu.

Flow distribution in water supply and distribution systems with automatic pressure regulators

Summary

The task of flow distribution in general pipeline systems including the systems of water supply and distribution with automatic pressure regulators is considered. To improve the reliability of the system operation pressure regulators are often installed «downstream» (redu­cing valves) and «upstream» (tank release valves). Pressure regulators manufactured by Bermad have been installed in the water distribution networks of Irkutsk; that provided for reducing and stabilizing the pressure in some zones. However zones exist that are supplied from several water pipelines with different pressure at the connection points, therefore sometimes complete closing of some regulators occurs (more often with small diameters) or flow reversal is possible, and the water flows through the regulator in the opposite direction. In this case the regulator fails to fulfill its function. Mathematical modeling of such situations is very important because it is them which significantly complicate the operation of the water supply and distribution systems. Mathematical models of automatic «upstream» and «downstream» pressure and pressure drop regulators are suggested with account of their version: normally open or normally closed. The mathematical formulation of the problem of flow distribution in the systems of water supply and distribution with pressure regulators is presented. The critical for the practice task of flow distribution in the pipelines with automatic regulators has been solved for the setting that describes different scenarios of the automatic regulators operation. A simple and efficient method of solving the set task of flow distribution that does not require derivation and has rapid enough convergence is suggested. On the basis of the numerical experiments it is fair to assume that the number of iterations moderately depends on the dimension of the problem (number of nodes and semicircular arcs), considerably depends on spread of hydraulic resistance values and to a lesser extent – node selection.

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№12|2013

AUTOMATED AND INFORMATION MANAGEMENT SYSTEMS

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UDC 628.144

Bol'shev K. N., Ivanov Vasilii Alekseevich, Stepanov A. A., Varfolomeev G. R.

Temperature and pressure monitoring system of the water distribution networks of Yakutsk

Summary

The information on the design of the system of monitoring temperature and pressure in the water distribution networks of Yakutsk is presented. In operating the municipal water supply under low temperature conditions continuous water temperature and pressure monitoring in the network is needed to prevent from pipeline freezing and overheating of the pumped water. To this end automated systems of temperature and pressure monitoring in the networks have been deve­loped. To provide for the data remote transfer for the system control Circuit Switched Data (CSD) technology for GSM mobile networks is used. With the help of this technology two GSM modems can establish a communication channel for import of data. For the operation of this system at a remote measuring point a cellular communication signal of the selected operator at the facilities together with continuous power supply shall be available. AIR-10N pressure sensors and TSPU-205-N temperature sensors were used as transmitters with 4–20 mA standardized signal; CPU – computer-process interface modules manufactured by Elemer SPE OJSC were used for subsequent transformation of signal and interface. Exchange of data between the computer and analogue input modules is ensured by MODBUS protocol version. To provide for the system control an information computerized system including a data base with Microsoft SQL Server 2008 Express, a service of terminal polling with the help of Windows service application, and an operator interface was developed. At present the system is operating steadily in the mode of systematic polling. The designed system can provide for collecting data from 200–300 measuring points.

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vstmag engfree 200x100 2

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Российская ассоциация водоснабжения и водоотведения

Конференция итог

ecw20 200 300

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