Turn off the pump – with a thud
Thread Content
This post was last edited by Huang Ju on 2023-8-5 09:44. When shutting down the device, I saw this tube; it moved downward following the arrow, and the rubber flexible connector provided cushioning protection. There was a bang; a pipe burst in the area indicated by the box earlier. It’s likely that the support structure and the pipe collided there, resulting in the pipe bursting
Everyone, I have set the inverter to shut down gradually, with a timing of 80 seconds, but there is still that loud noise. Possible reasons: the check valve is rusted, or the valve core is stuck from time to time. I’ve disassembled similar ones before; the springs inside have rusted away, but the valve plate still functions and can be closed. I tested it and no water came out
In this case, direct contact between the pipe supports and the pipe itself can lead to pipe rupture. When shutting down, you will see a rubber gasket at the location indicated by the arrow on the pipe; it serves as a cushioning element for protection. However, tube ruptures have occurred before; it is likely that the bracket in this area came into direct contact with the pipe, resulting in the tube rupture. .
Thank you. Are there any ways to improve this and avoid it?
Water hammer: When shutting down the pump, close the pump outlet valve slowly to reduce the flow rate of the material in the pipeline before stopping the pump
Obvious water hammer effect. The reduction in the rate of flow velocity in the pipeline when the pump is stopped can be eliminated. The ideal approach is to reduce the flow rate before shutting down the pump ； Others: Use check valves with slow closure (which make it difficult to eliminate hammering effects on the pump); install multiple check valves in the piping system to distribute the impact forces (this increases the number of components required); use pumps with variable frequency control (but such controls may not be able to reduce the flow rate before shutdown to a harmless level) ……
Hydraulic shock, commonly known as water hammer. When shutting down the large pump, it is necessary to close the outlet valve slowly; wait until the pressure indicated on the pressure gauge connected to the outlet valve rises before turning off the pump. In your case, it is clear that the outlet valve was not closed in time, which led to water flowing back and causing hydraulic shock
Water hammer. Replace with a slow-closing check valve. The design at that time did not take into account pressure increases caused by water hammer, which could lead to pipe bursts.
Similarly, when the fire pump was turned off before, there was a loud noise – the sound of the check valve hitting something
The water hammer effect occurs when valves are closed slowly; this is especially likely to happen in pipelines with large diameters.