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| Study on water hammer protection of pump system with high head and long climb |
| LIANG Xing1*, LI Yan1, LIU Meiqing2, WANG Yunlong1, CUI Shijie1 |
| 1. Nanchang Key Laboratory of Low Grade Energy Conversion and Systematic Energy Saving Technology, Nanchang Institute of Techno-logy, Nanchang, Jiangxi 330099, China; 2. School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei 430072, China |
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Abstract In view of the water hammer protection problem of accidental pump showdown in ″high head and long climb″ water delivery systems, by taking a water supply project as an example, the transition process characteristics of different water hammer protection measures such as one-way surge tank, air tank and air valve were analyzed based on the characteristic line algorithm, and the water hammer protection characteristics of air tank were focused on. The results show that the arrangement of air tank after the pump can effectively raise the minimum water hammer pressure in the climbing section, and as the volume of the air tank increases, the overall water hammer protection effect improves greatly, although the reverse rotation speed of the pump increases slightly. The one-way pressure regulating tank has a strong protective effect on pipelines when elevation is lower than the water level in the tank after the installation point, but has almost no protective effect on the climbing pipelines before the installation point. The combined water hammer protection measures based on air tanks, one-way surge tank and air valves are adopted, for which the maximum water hammer pressure under optimal solution is 348.98 m and the minimum water hammer pressure is -2.87 m, which meets the water hammer protection requirements. For pump systems with ″high head and long climb″, a combined water hammer protection using air tanks is a safe and economic protection scheme.
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Received: 17 March 2023
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