The Calculating Review On Raw Water Pipeline Hydraulic Transition Process Of A City In South China

Currently, more and more water supply companies pay much attention to the security of urban water supply. Long-distance water distribution projects become very common in recently years. T hese projects solved the shortage of local water resources, poor water quality, seasonal water shortages effectively. However, the long-distance water distribution systems also face ma ny technical problems due to the long distribution distance, multiple operating conditions and hydraulic sections. Water hammer is one of the most serious technical problems. It could damage the whole pump units and pipelines, cause the flooding of urban a rea and water supply interruption. T herefore, it is extremely import to prevent water hammer for water supply pipelines.The target project is located in a city in South China. The total water supply capacity is approximately 100×104m3/d. T he Pumping Stati on A is the main raw water pumping station for this city. The raw water is collected from the upstream reservoir and the water supply capacity is 80×104m3/d. T he pumping Station A is responsible for supplying raw water to Water Treatment Plant B during the whole year and Water Treatment Plant C during the period of salt tide, respectively. A total length of the raw water pipeline between Pumping Station A and Water Treatment Plant B as well as Water Treatment Plant C is 19042 m. The total pipeline length to Water T reatment Plant C water is 20897 m. T he pipeline diameter is DN2200-DN1800.After proposal comparison, the one-way tower was finally set up along the water distribution to avoid the water hammer. In this study, computer simulation was utilized to calculate the optimal parameters for one-way tower settings and the hydraulic change process under the critical conditions of power failure in pump station and the pipeline burst. The supply system security was double-checked and the initial parameters for one-way tower settings were also adjusted. The water supply dispatch is affected by the salt tide and the hydraulic conditions change greatly during the switch between the conversion period of salt tide and non-salt tide. T herefore, the optimal valve closing time and other operating conditions were also checked to improve the water supply system security. T he findings of this study could provide very important security and scientific criteria for the structural arrangement of the water distribution system, pu mp stations and operating conditions for various types of valves.