Analysis of City Sewerage Networks Operation

Summary

Results of the analysis of the data base on operation failures of sewerage networks of the city of Samara during the last 9 years of their operation are presented. From the point of view of reliability the gravity sewerage networks are the weakest element of the city wastewater disposal system. According to the statistical data the clogging is the cause of 99% of failures of functioning of the sewerage network. Most of the clogging (over 97%) happens at pipelines of up to 250 mm diameter. In the course of drawing up the schedules of planning-preventive works the operation departments should take into account the seasonality and pay particular attention to the sections of sewerage network with pipes of small diameter. During the reconstruction of gravity sewerage pipelines of less than 250 mm diameter it is recommended to use plastic pipes and pipes of larger diameter.

Key words

reliability , leak-proofness , sewerage network , clogging , damages

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UDC 621.644.075.004.6

Pokhil Yu. N., Grigorashchenko V. A., Lankevich N. V.

Innovation Technologies of Trenchless Replacement of Dangerous Pipelines

Summary

Innovation technologies and complete sets of equipment used at municipal water supply and sewerage networks for the trenchless replacement of emergency state pipelines of up to 600 mm diameter are presented. The technologies offered are notable for their principle novelty, high economic efficiency, do not demand earth works, the equipment and mechanisms are easy-to-manufacture. The use of up-to-date technologies makes it possible to abandon the construction of new communication means and service pipelines, to rehabilitate and improve completely the technical characteristics of operating networks after their reconstruction. Domestic developments possess higher technical and economic indices than their foreign analogous (output by 1,3 times, durability by 2–2,5 times). Technologies and mechanisms took out 57 patents including 7 foreign and 24 licenses were sold.

Key words

leak-proofness , trenchless laying , water-carrying pipelines , innovation programs , pneumatic hammer , rope , winch , water flow

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UDC 621.643-034.14.004.67

KOSYGIN A. B., FOMINA I. V., GORICKIJ V. M., HROMOV D. P.

Methods of Assessment of Technical State and Residual Resource of Pipelines of the Moscow Water Supply and Sewerage Networks

Summary

The goal of investigation of water supply and sewerage systems of Moscow conducted by the Center of technical diagnostics of MGUP Mosvodokanal is the assessment of technical state of networks and development of recommendations for their further operation, reconstruction and relaying. Methods of the complex diagnostics of steel pipelines of water supply network in manifolds, pumping stations’ piping, underground pipelines laid in soil and steel pipelines of pressure sewerage network have been developed. When determining the time of possible safety operation of pipelines of water supply and sewerage networks, these methods make it possible to take into account all types of the most intensive influences contributing mainly to formation of stressed-deformation state that improves technical validity and reliability of results obtained.

Key words:

leak-proofness , water supply and sewerage networks , assessment of technical state , residual resource of pipeline , diagnostics , strength

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UDC 628.162

GALPERIN E. M.

Improvement of a Design Model of Operation of a Ring Water Supply Network

Summary

Issues of improvement of the design model of operation of the ring water supply network taking into account statistical data on its operation are considered. It is proposed to make corrections in the standards of water supply systems designing and supplement them with execution of reliability calculations of the ring water supply network.

Key words:

water supply network , water supply , head , reliability , failure , leak-proofness , Failure , designed model