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UDC 628.147.2
Karmazinov F. V., PANKOVA G. A., Ipatko M. N., IGNATCHIK V. S., Ignatchik S. Iu., Sarkisov S. V., Putilin P. A.
Methods of optimization of the zoned water supply system
Summary
The method of optimization of water supply systems with account of the expenditures for eliminating failures in the water distribution networks depending on the pipe material, diameter and network operating pressure is presented. Computational simulation of the hydraulic operational modes of the water supply system (with the use of the mathematical model) with determining the optimal operating pressure in the dictating point of the network was carried out. The developed method of the water supply system optimization provides for determining the operating expenditures at different pressure values in the distribution networks; determining the cost effective operational mode with account of the investment and operation and maintenance costs; optimizing the electric energy costs with account of the cost of eliminating failures in the water distribution networks that depend also on the design pressure value.
Key words
water supply system , optimization , net discounted expense , rate of failure , pressure in the water supply systems , operation and maintenance costs

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UDC 628.292.65.011.4
Ignatchik S. Iu.
Estimation of reliability, safety and investment efficiency of a wastewater disposal system
Summary
Basic principles of the procedure of estimating reliability and safety of wastewater transportation for treatment at reduced operational lifetime investments by the example of a sewerage network in Osinovaya Roscha settlement of the Leningrad Region are presented. The feasibility study of a sewerage network project design first defines the probability safety characteristics for each of the network elements; then probability and parametric reliability characteristics are determined. Hereafter the optimal network design is selected with the help of the said characteristics.
Key words
reliability , safety , sewerage network , investment construction project , net discounted expense

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UDC 628.292.65.011.4
PANKOVA G. A., Il'in Iu. A., IGNATCHIK V. S., Ignatchik S. Iu., Melnik E. A., Probirsky M. D., Karmazinov F. V., Mikhailov D. M.
Technical inspection of sewage pumping stations in SaintPetersburg
Summary
Basic results of technical inspection of the pumping stations delivering wastewater to the treatment facilities are presented. In the process of inspection the following parameters are determined: the impact of physical wear of the pumps on Н–Q, h–Q, P–Q, Wуд–Q characteristics; actual schedule of wastewater inflow; probability and parametric pump reliability factors. The operation of the «feeding sewer – sewage pumping station – pressure sewer» system is analyzed. The investment efficiency of upgrading the engineering aspect of the pumping stations with account of the safety requirements in relation to the environment, reliability and energy saving during the equipment life cycle is estimated.
Key words
wastewater , power consumption , operation expenditures , pumping station , net discounted expense , design mathematical model , reliability estimation

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UDC 628.292.65.011.4
Ignatchik S. Iu.
Energy conservation and reliability assurance in upgrading sewage pumping stations
Summary
The main principles of reliability and energy conservation calculation method for designing the upgrade of local sewage pumping stations that are transferring wastewater to the treatment facilities are presented. When preparing a feasibility study of the project design the technology and probability indices of reliability for each element of the process part of the pumping station together with probabilistic and individual dimension reliability are determined. The option of upgrading the process part is selected with account of the environmental requirements and investment efficiency of the project.
Key words
wastewater , power saving , operation expenditures , pumping station , calculated hydraulic model , net discounted expense , reliability indices

