Hydraulic model in the water distribution network operation control in the city of Saint-Petersburg

Summary

The experience of Saint-Petersburg Vodokanal applying hydraulic models of the water distribution network in tackling most complicated technical problems is described. The process of establishing a comprehensive system of water supply management includes multioption hydraulic calculations and assignment of the control points to control the operation of pumping stations. The investigations of the network resistance are carried out, models are specialized and new simulation trends are developed. The development of information systems that supply the initial data for the models as well as data exchange provide for improving the accuracy of the calculation results and introducing new calculation types.

Key words

water supply network , information system , breakdown rate , hydraulic model , control points in the distribution network

Hydraulic model for monitoring and control of the Tumen public water supply operation

Summary

Geographic information technologies allow facilitating significantly the task of operating the public water supply of an urban. In Tumen designing a hydraulic model of the water distribution network operation on the basis of «Zulu» program-design package has been carried out since 2006. The system is aiming at improving the quality, reliability and energy efficiency of the water supply and distribution operation. At the initial stage an integrated design scheme of the major water mains was developed. This hydraulic model provided for developing and implementing a number of important measures for the optimization of the water distribution network operation mode in Tumen. To improve the accuracy the model was further detalized by adding pipelines to every customer into the design scheme. At the same time pipeline certification started with recording results in the geographic information system. Calibration of the detailed hydraulic model was carried out on the basis of the information obtained from 530 pressure gauges installed at the residential service connections. The carried out calculations were noted for high accuracy (to 0.3 atm deviation). With the help of the detailed hydraulic model the following tasks are being accomplished in «Tumen Vodokanal» LLC: changing the operation modes of the pumping stations, planning water mains outage, determining technical possibility of connecting new objects. Basing on the calculations in 2011 a project of installing 24 pressure control valves in the water distribution network was implemented. The geographic information system is noted for the function of using map layers of tile-servers in Internet, as well as for possible data storage and failure analysis. The information obtained in the process of using the detailed hydraulic model is widely used by the distribution network operating service of «Tumen Vodokanal» LLC for the team task description and determining gate valve closure pattern.

Key words

pipeline , pump , pressure regulator , geoinformation system , control points in the distribution network , hydraulic model , certification

Improving the system of the water distribution network
operation control in Tumen

Summary

Owing to large-scale housing construction in 2004–2008 the water consumption in Tumen significantly increased. The growing loading on the water facilities resulted in intermittent insufficient pressure level at the pumping stations in separate municipal districts. These irregularities actually «shattered» the water supply system; and in case of continuing water consumption pattern they could have caused complete water deficiency and water supply collapse because of the lack of the capacity reserve already in 2009. To handle the problem the upgrade projects were urgently updated – the parameters of the pumping units and their control algorithms were revised. The key role in calculations played the studies of Boris Semenovich Leznov, a famous research worker in the field of variable speed drives for pumping units. The system of water intake control was qualitatively modified. Pressure gauges were installed at ten critical control points in the distribution network that transmitted on-line data to the Central Control Service. Upgrading pumping stations and using reliable information on the distribution network operation provided for uninterrupted water supply of the entire city. Operator’s control of the emergency situations in the water distribution network was an additional advantage of pressure monitoring. In 2011 and 2012 variable speed drives were put into pilot operation at the second-stage pumping stations of the Tumen public water supply. As a result the stable operation of the pumping equipment and energy saving were ensured; throttling was abandoned. At present the control algorithms for complete automation of the municipal water supply are being designed.

Key words

pumping station , control points in the distribution network , water supply optimization , pressure monitoring