| CONTENTS N7 2004 |
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PROBLEMS, PERSPECTIVES |
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| E. I. Pupirev. Economic Aspects of Introduction of the European Stan-dards for Potable Water Quality in Russia The most important aspects of introduction of the European Standards for potable water quality in Russia are considered; technical, organizational and economic measures are proposed. |
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| A. F. Poriadin. Environmental Protection Management in the System of Vodokanals of Russian Cities It's proposed to plan the protection of environment in the system of Vodokanals that will serve to ecological safety of water usage. |
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ENERGY ECONOMY AND RELIABILITY |
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| B. S. Leznov, V. B. Chebanov. Technological Principles of Energy Saving at Pumping Stations The main principles to be taken into account when designing the automated energy saving control systems equipped with regulated electric drives have been formulated. |
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| Yu. A. Trukhin, V. I. Luptakov. Reduction of Energy Expenditure in the Course of Operation of Centrifugal Compressor Engines The problem of reduction of energy expenditure at the air blasts of aeration stations are considered. |
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| E. M. Zorkin. Technical Specifications for Pump Stations of Water Supply to Closed Irrigation Systems The problem of automation of the pump station for agricultural irrigation systems taking into account the technological requirements placed upon the automation system and problems of increase in efficiency and reliability of water supply system operation is considered. |
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| S. K. Khusainov, R.N. Suleymanov. Analysis of Efficiency of Centrifugal Pumps Operation in the System of City Vodokanals A high level of vibration of centrifugal pumps reduces the time between repairs, accelerates the foundation failures and increases the operation costs. |
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| L. I. Kantor, B. E. Levinskikh, R. N. Suleymanov. Estimation of Centrifugal Pump Efficiency Taking into Account the Temperature of Water Pumped The thermodynamic method of estimation of the pump units efficiency has been approved in oil industry; it's recommended to employ it in the system of city Vodokanals. |
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| D. G. Shkerdin. Frequency Converters for Pumps Energy Saving Drive The Driving Technique. Scientific and Technical Centre Co. has developed and produces the frequency converters of AĻ-140H series and automated control systems for pump units oriented to control the pumps and ventila-tors. The converters allow to create the regulating system without addi-tional equipment; they have incorporated program functions realizing dif-ferent operation tasks. The description of functional parameters of these converters; examples of their use at the real objects of water supply are presented. |
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| A. A. Shikhov, V. A. Andrianov. Use of Frequency-Adjusted Drive in Energy Saving Systems of Pump Unit Control The use of frequency converters at water supply and sewage pump stations to control the pump units' electric motors is one of the most effective methods of energy saving. |
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| A. A. Glumin. Why the Breakdowns at Underground Pipelines Occur The reasons of breakdowns at underground cast-iron pipelines have been analyzed. It has been determined that in 90-95 % of events they take place because of daily fluctuations of pipe walls temperature. |
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| Abstracts of the Articles Published in the Issue ¹ 7 | 40 |