acdecal
Mechanical
- Nov 16, 2007
- 5
We have installed 30 HP storm pumps with about 500 lineal feet of 6" discharge piping. A check valve is installed in the pit near the pump discharge. The pump lifts the water approx 40 feet along the route (inside and outside of the building) with quite a few offsets. The pipe is hung from a trestle and the building steel. The final point of piping discharge has a 10' drop into a pit. A soft start/stop was installed to control the pumps. When the pump stops the pipe bangs violently at some offsets about 160' upstream from the discharge point. This is also near the highpoint of the system.
There is no noise or movement when the pump starts. The check valve slamming after the pump stops could be causing a shock wave but there is no reaction anywhere near the beginning of the run. Maybe the tail end of the system trying to drain the final leg while air is trying to move upward is causing the problem. We are thinking of adding a air relief valve at the highpoint. Any thoughts or experience with this problem?
Thanks in advance.
There is no noise or movement when the pump starts. The check valve slamming after the pump stops could be causing a shock wave but there is no reaction anywhere near the beginning of the run. Maybe the tail end of the system trying to drain the final leg while air is trying to move upward is causing the problem. We are thinking of adding a air relief valve at the highpoint. Any thoughts or experience with this problem?
Thanks in advance.
