Analysis and assessment of water distribution network failures in Samara

Summary

The main task of the water distribution network maintenance and operation service is improving the quality and reliability of supplying water to the customers. The analysis of the water distribution network state in the urban district of Samara showed that the majority of the pipelines had been significantly depreciated. This is caused by fact that they were laid and put into operation during the period of large-scale housing construction (1960–1980-ies) without due account of the requirements to the durability of the materials applied and technical and organizational capacity of the operating companies. According to the statistics lately the rate of failures in the water distribution networks has been gradually but sustainably reducing. The assessment of the data on the operation and maintenance of the water distribution networks showed 22% reduction of the total number of failures in 2015 compared to 2013; accordingly water losses also decreased. Achieving these results was possible due to the timely repair and maintenance works in 2013–2015.

Key words

water supply network , breakdown rate , water leaks , pipe material , pipeline failure

The use of pipes made of various materials for the construction of sewer networks

Summary

The results of the analysis of data on sewer networks in settlements of Russia as of 2014–2019 are presented. All settlements are divided into six groups depending on the number of inhabitants. For each group, the distribution of sewer networks is established depending on the material of the pipes. Сeramic and cast iron pipes have been most widely used over the past 100 years. Schedules for commissioning sewer networks made of various materials over the years have been developed. Over the past 20 years plastic pipes have gained widespread use accounting for about 50% of newly constructed sewer networks. Information was collected on the commissioning dates of individual sections of sewer networks. The largest number of the operating sewer networks was built between 1970 and 1979. In general, the standard service life for 55% of networks was exceeded in all settlements. In the coming years, a significant increase is expected in the share of plastic pipes in the total length of sewer networks.

Key words

sewerage network , pipe material , hydraulic characteristic , network length , standard service life

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Methods ofimproving the reliability of water distribution network operation

Summary

The conditions of providing for the integrity of the water distribution network for maximum possible period are considered. On basis of analyzing the mathematical expression developed with the use of mass service system device the conditions of ensuring water distribution network integrity are determined. It is established from the experience of water distribution network operation that pipe material and repair time are critical for reliability improvement. Ductile iron pipes with interior cement-sand coating and PVC pipes as better meet this requirement.

Key words

water supply network , integrity , water supply system reliability , pipe material , repair time , failure rate