Evaluation of efficiency of using plastic pipelines for reconstruction of municipal water supply networks

Abstract

During the reconstruction, the characteristics of individual sections of the network change, which affect the performance of pumping stations. Therefore, the task of predicting the impact of sections of the network to be reconstructed on changes in pressure losses in the network and the piezometric mark at the point of connection of water mains to the network is urgent. To date, there is no scientific approach that allows you to reasonably choose methods of restoration or repair of water supply networks, focusing on most parameters of its operation, there is no clear mechanism for choosing effective trenchless methods of repairing underground communications. The research is aimed at determining the factors that affect the hydraulic characteristics of the water supply network after the reconstruction of some of its sections.

The aim of the work is to study the influence of changes in the resistance of individual sections of the network during its reconstruction on the value of pressure at the point of connection of water mains to the network. To determine the influence of the resistance of individual sections of the network during its reconstruction on the pressure value, methods of mathematical modeling of the resistance of sections of the network, methods of hydraulic calculations of water supply networks were used.

Achieving the goal involves a number of tasks: modeling 31 options for the reconstruction of the network by the number of individual sites; modeling of 15 variants of change of resistance for each site; performing hydraulic calculations taking into account the change in resistance of each of the sections; determination of pressures at the point of connection of water mains to the network for different values ​​of change of resistance of sites.

The results of research have shown that with increasing the resistivity of the sites, the required pressure at the point of connection of water mains to the network in most cases increases. As the resistivity of the sections that were on the shortest paths from the point of connection of water mains to the unfavorable point increased, the pressure at the node of water supply connection increased. This is due to the reverse direction of water movement in these areas relative to the dictating node. The increase in resistivity in the areas located on the shortest direction has the greatest effect on the value of the pressure at the point of connection of water mains. (up to 6%).

Тhe development of an operational method for assessing the impact of reconstruction on the hydraulic performance of the network will allow utilities to determine the volume and methods of restoring the capacity of individual sites and the network as a whole.