Determination of the impact of the network structure on node pressure distribution

Abstract

In the event of an accident on certain parts of the network, the operational redistribution of flows in it allows to reduce significantly the negative consequences of the accident. The effect will be greater the shorter the time between the start of the accident and the measures taken. The general unsatisfactory condition of the water supply networks in Ukraine and the high incidence of them require from the dispatching services of the utility companies prompt response to eliminate the consequences of emergencies. However, most utilities do not provide the ability to make rapid changes to the flow management system, which impairs its efficiency. Given the above, it is relevant to continue research on the influence of network structure on the distribution of nodal head.

In this work the influence of separate sections of the water supply network on the dynamics of nodal pressures for different conditions of supply is investigated. The results of investigations of peculiarities of formation and change of the area of areas of insufficient head with the account of emergency situations for networks with different structure are presented.

The tasks to be solved by the flow management system at the design stage of the networks are identified. According to the results of the researches, the conditions of water supply were formed when the zones of insufficient head were formed

The research methodology consisted of the following stages: development of initial schemes; performance of hydraulic calculations at normal network modes; modeling of emergencies; performance of hydraulic calculations in emergency situations and analysis of their results; analysis of the joint work of pumps and water supply systems.

Modeling and analysis of pressure zones in the network, depending on the need to change the number and location of pressure control units. A distinctive feature of this approach to flow management is timely prevention of emergencies, setting the optimum network structure and operating modes. The proposed methodology for managing the distribution can be implemented in the work of dispatching services of utility companies.