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UDC 621.65:62-531.3:628.1
Goryunov A. N.
Interaction of Pumping Plants of the First Lift and Water Treatment Facilities
Summary
To ensure the effective work of a water treatment station, the coordination of operating modes of a pump station of the first lift with maintenance of the predetermined level at treatment facilities or in pure water tanks, and maintenance of the predetermined discharge to treatment facilities as well depending on the city’s water consumption is necessary.
Key words:
potable water , pumps , startup mode , treatment facilities , frequency of rotation , tank , turbidity , adjustable electric drive
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UDC 621.65.62-531.3:628.1/.2
Sivolov G. E., Karmalov A. I., Ivanson P. B., Iskhakov Yu. B.
Multilevel Automated Control System of Technological Processes of Water Supply and Wastewater Disposal
Summary
The stages of creation of the multilevel automated control system of technological processes of water supply and wastewater disposal with the use of an adjustable electric drive in pumping units, microprocessor and computer hardware are considered. A brief review of principles of operation of the system’s components is done. To ensure the uninterrupted water supply and wastewater disposal JSC Seversky Vodokanal realizes the project of creation of the multilevel automated system of control over technological processes of lifting, treatment and transportation of water to consumers with subsequent wastewater disposal to the city’s treatment facilities. The implementation of the project is carried out step-by-step.
Key words
adjustable electric drive , sewerage pumping station , automated control system , power saving
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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.
Key words
adjustable electric drive , pressure , water supply , pump unit , water supply system , water saving , energy , non-productive discharges of water
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UDC 621.671
LEZNOV B. S., Vorobiev S. V.
The operation of centrifugal pumps with variable speed
Summary
The technologic aspects of using variable speed drives in pumping units are considered. The operation of centrifugal pumps with variable speed of the impeller is analyzed with account of the impact produced by water mains characteristics on the working parameters of pumping units. It is shown that reducing the pump impeller rotation speed can in some cases result in cavitation, surging, pump rotation speed resonance and resonance of the free lateral vibration of the shaft. Possible pump operation with rotation speed higher than the rated value is considered.
Key words
adjustable electric drive , centrifugal pump , variable speed , pump moment resistance
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UDC 621.671
LEZNOV B. S., Vorobiev S. V.
The operation of centrifugal pumps with variable speed
(The termination, the beginning see here)
Summary
The technologic aspects of using variable speed drives in pumping units are considered. The operation of centrifugal pumps with variable speed of the impeller is analyzed with account of the impact produced by water mains characteristics on the working parameters of pumping units. It is shown that reducing the pump impeller rotation speed can in some cases result in cavitation, surging, pump rotation speed resonance and resonance of the free lateral vibration of the shaft. Possible pump operation with rotation speed higher than the rated value is considered.
Key words
adjustable electric drive , centrifugal pump , variable speed , pump moment resistance
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UDC 628.3:658.26.004.18
Tchebanov V. B.
Technical and economic aspects of using variable-speed drive in pump units
Summary
The introduction of variable-speed drives is considered as an integral part of the program of reducing pump unit power consumption. Power conservation can be provided both by eliminating pressure excess and by increasing average pump efficiency that can be achieved primarily by pump selection depending on the water and wastewater network operation mode. Pump efficiency depends significantly on the number of operating pumps with variable-speed drives as well as on the algorithms of their interaction with non-controlled pumps. The examples of calculating energy saving and investments for two pump units are presented. The decision on the volume of investments in variable-speed drive retrofit and pump unit upgrade shall be taken on the basis of a business project.
Key words
adjustable electric drive , water supply , pump , power consumption , water disposal , excessive head , power saving
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UDC 621.65:62-531.3
Economic efficiency of using pumping units with variable-speed drives at low water supply
Summary
In the process of operating pumps with variable-speed drive at low water flow rates the reduction of the pumping unit efficiency factor is observed. It is suggested to determine the amount of energy lost during the operation of such pumping units with actual efficiency factor differing from the rated one. In some instances operating with low water flow rate results in power consumption increase. In this context experimental studies on determining the pumping unit efficiency factor at different impeller speeds were carried out. The results of the studies provided for identifying the optimal operation zone where the pumping unit efficiency factor was reduced by less than 2% of the maximum value, and the less economic zone where the efficiency factor was reduced to 35% of the maximum value. To evaluate the economic efficiency and determine the optimal operation area of pumping units with variable-speed drives at low water flow rate the efficiency curves for different pump impeller speeds are required. It is appropriate to include this data in pump catalogues.
Key words
adjustable electric drive , water supply , flow rate , head , frequency of pump impeller rotation , pump , water disposal , lifting efficiency , electric motor power
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УДК 628.1/.2:658.26.004.18
LEZNOV B. S., Vorobiev S. V., Iskhakov Yu. B., Tchebanov V. B., Koptev V. S.
Power audit of water and wastewater utilities
Summary
The aspects of investigating power efficiency (power audit) of the water and wastewater utilities are considered and basic guidelines on the auditing procedure are given. Power audit shall include thorough investigation of the basic water treatment and conveying technologies. Power audit shall be carried out by professional companies experienced in working at water and wastewater utilities, and applying relevant technologies. Herein it is reasonable to use a target power auditing program as well as a special power certificate that reflect technologic features that determine the utility power consumption.
Key words
adjustable electric drive , aeration , pumping station , water supply-sewerage services , power audit , air blower unit , power efficient system
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