Introducing degassing systems to improve the operation efficiency of water pumping stations in Tumen

Summary

Second elevation pumping stations are an integral part of the water treatment facilities and supply drinking water to the municipal water distribution network. Water is pumped out of the service reservoirs. As a rule they are buried reinforced-concrete facilities. To provide for the sustainable operation of the «service reservoir-pump» system the competent management of the water levels in the reservoirs is an essential condition during pump operating at any water supply range. Affected by the objective and judgmental factors the operation of this part of the process scheme can be either insufficiently reliable to ensure continuous water supply to the city, or insufficiently efficient for the water treatment process in relation to the energy consumption. The similar situation can be observed in Tumen; to different extents it is related to two water intakes – Metelevskii and Velizhanskii. Possibly this problem is not exceptional for Tumen; it may be observed in other cities. Based on the Tumen experience it is shown that changing the operation mode of the pumping station supplying water to the city provides for reducing the energy consumption by 5.6% and the number of emergency team visits to the wells. The results of the conducted measures assume further improvement of the reliability and efficiency of the water distribution network operation. Furthermore, it is essential to develop an algorithm of the optimal operation of the first elevation pumping station (with pump replacement) and treatment facilities, and to computerize the process.

Key words

clean water tank , water abstraction facilities , second lift pump station , vacuum system , vacuum pump , optimization of the operation of the pumping stations

Advanced equipment for safe air exchange in clean water tanks

Summary

The substantiation of the lack of engineering support of drinking water quality in relation to the hygienic regulations before supply to the customers is given. The comparative analysis of the engineering solutions of clean water tank maintenance is presented. Basing on the experience of designing water and wastewater networks the design of air exchange unit has been developed that outperforms the existing engineering solutions. The main advantage of the air exchange unit compared to the typical absorbing filter is the compactness that allows eliminating the costs of attaching generic design documentation, reducing the total cost of equipment and building and assembly works. The developed air exchange unit for clean water tanks is successfully replacing outdated standard absorbing filters. The fabrication materials ensure environmental resistance and allow operating the unit virtually in any climatic region at the temperature of –60 to +40 °С.

Key words

water and wastewater systems , clean water tank , absorbing filter , air exchange unit

Strategy for repair and reconstruction of clean water tanks

Summary

The tank farm of water supply systems in Russia is represented mainly by reinforced concrete tanks of various volumes. Due to their long service life, often exceeding the standard, these facilities have specific defects and damage that reduce their operational reliability. Analysis of the results of technical inspections of tanks of different design, capacity, and service life indicates that the defects and damage are related either to physical deterioration of the structures because of corrosion or to the uneven earth foundation settling. This damage and deformation of the structures result in loss of tank integrity. Restoring the operational reliability of structures is possible two-ways: capital repairs or reconstruction. Currently, the domestic regulatory framework lacks documents regulating the choice of repair and reconstruction methods for drinking water supply tanks. The study materials are presented that can be used as a substantiation of draft regulations including a list of tank repair and reconstruction works, as well as the technology. Performing these works will provide for the reliability of tanks with varying service lives, both until the end of their standard service life and for the subsequent design period.

Key words

protection from corrosion , clean water tank , эксплуатационная надежность конструкций , structural damage , integrity restoration , durability of reinforced concrete , service life , repair and reconstruction