LIJian-yu,WEIJu-wang.Analysis of Valve Closing Water Hammer at the End of Long-distance Gravity Flow Water Transmission Pipeline and Its Protection[J].China Water & Wastewater,2022,38(7):51-55.
Analysis of Valve Closing Water Hammer at the End of Long-distance Gravity Flow Water Transmission Pipeline and Its Protection
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第7期
Page:
51-55
Column:
Date of publication:
2022-04-01
- Keywords:
- long-distance water transmission pipeline; gravity flow; valve closing water hammer; surge tower
- Abstract:
- For long-distance water transmission pipeline with large one-time investment and great importance, its water hammer protection measures are critical to the safety and stability of water supply. The length of a gravity flow water transmission project in Africa is 57.6 km，its terrain is high on both sides and low in the middle, which makes it difficult to reduce the water hammer. After determining the maximum allowable pressure, valve closing time and valve closing mode of the pipeline, a series of combined protective measures such as inlet valve, exhaust valve, surge tower and overpressure decompression valve were adopted to simulate and analyze the harmful water hammer caused by valve closing at the end of the pipeline. The results showed that, the traditional fast forward and slow exhaust arrangement of the inlet valve and exhaust valve was not universal, so the arrangement method should be reasonably selected according to the actual situation of the project. The combination of inlet valve, exhaust valve and surge tower could effectively eliminate the negative pressure and positive pressure caused by water hammer of cavities collapsing. When they were further combined with overpressure decompression valve, the harm caused by water hammer could be reduced to the bearing range of the pipeline, so as to guarantee the safe operation of the water transmission network.
Last Update:
2022-04-01