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

The experience of introducing TV-inspection of sewers

Summary

Sustainable operation of utility distribution systems is an essential condition of ensuring comfortable life in megacities. Integrity and long operational life are the main requirements to the different-purpose pipelines (gas and water supply, sewers etc.). Regular TV-inspections of sewer condition provide for more efficient distribution of operation and repair expenditures, reduction of emergency repairs. The practical experience of establishing a TV-inspection laboratory in «Tumen Vodokanal» LLC and the results of its activities during 2011–2013 are presented. TV-inspection is an advanced technology of evaluating technical condition of underground utility distribution pipelines and engineering structures. The efficiency of the pipeline TV-inspection method when introduced into the flow process is shown. For the entire period of operation the TV-inspection laboratory specialists have investigated more than 350 objects, i. e. more than 46 kilometers of sewers, among them 30 kilometers of newly built networks. By means of using TV-inspection the time for determining the causes and locating blockages, leaks and other sewer pipe failures is reduced. Therefore, the amount of excavating and hence the general cost of repair works is reduced. Significant improving the culture and quality of construction works is an unconditional success of the laboratory activities. During two and a half years of the laboratory operations the number of facilities approved for operation on the first try increased more than 10-fold, whereas the number of defects to be eliminated with relaying or repair of pipe sections reduced more than 20-fold.

Key words

diagnostics , reliability , assessment of technical state , pipeline , TV-inspection , videocamera

Results of hydraulic calculations of the water supply and distribution system in Tobolsk, the Tyumen Region

Summary

The progress of process surveys and hydraulic calculations of the water supply and distribution system of Tobolsk by the specialists of «RVKN» LLC (Moscow), PAO «Sibirsko-Ural’skaia Energeticheskaia Kompaniia» (Tyumen) and its Tobolsk branch are covered. The work is based on the theoretical foundations and methods in the field of hydraulic calculations of water distribution networks carried out by leading Russian research workers, as well as the rich experience of numerous similar works carried out by the specialists of «RVKN» LLC in previous years. Process surveys included an on-site survey of the water distribution system rating the relevant characteristics of pumping equipment and a manometric survey. In the course of hydraulic calculations 25 different options were considered that involved seasonal changes in the modes of operation of the municipal water supply system with account of the compliance with the fire extinguishing requirements. At the same time special attention was paid to including the newly commissioned (upgraded) Sokolovsky water intake facilities. The analysis of the calculation results showed a low relevant process and structural reliability of the water supply and distribution system, especially of the currently operated Zhukovsky water intake facilities. The stage-by-stage program for the development of the municipal water supply and distribution system (WSDS) provided for the measures aimed at the optimization of the operation in the coming years, as well as the development of a reliable and prospective water supply scheme for Tobolsk.

Key words

assessment of technical state , hydraulic design , mathematic modelling , water supply and water distribution system , manometric survey , detailization and simplification of the calculation model , surplus hydraulic head , inefficient water losses , relevant characteristics of pumping equipment , process and structural reliability