Abstract:

Safe and controllable water hammer pressure is a necessary condition to ensure the stable operation of long pressurized piping system. However, in ultra-long pressurized pipeline system, extreme accidents such as local pipe bursts may paralyze the entire system or lead to secondary disasters due to the widespread propagation of water hammer pressure throughout the entire pipeline.To address this issue, we introduce a cylindrical overflow surge tower designed to block water hammer propagation. The surge tower features a vertical inlet pipe, which effectively segments the pipelines and prevents water hammer from spreading. We analyzed the hydraulic characteristics of this surge tower using both model tests and numerical simulations. Our findings indicate that the flow patterns within the tower are uniform, and the overflow water dissipates sufficient energy before entering the downstream pipeline. Finally, we describe the application of this surge tower to the Chaoer River to Liaohe River Diversion Project. Results demonstrate that the surge tower effectively blocks the propagation of water hammer in case of local pipe bursts, thereby mitigating the negative impact of water hammer on the entire pipeline system. The findings offer valuable insights into protection strategies against water hammer for ultra-long pressurized piping systems.

Key words: ultra-long pressurized piping system, transient process, water hammer protection, blocking-up surge tower, hydraulic characteristics