The issue of high flow rate in multi-stage pumps
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Our company has newly installed a 100m3 hydrolysis pump, but the flow rate during actual operation is less than 50m3, which causes the pump to break down frequently. The bypass valve uses a 57-mm pipe; it is initially suspected that the bypass pipe is too thin. We are considering installing another bypass pipe using a 57-mm pipe at the pump’s outlet – is this feasible?
If the secondary pipe is too thin, it is possible to increase its diameter. If it is not caused by this reason, other causes need to be sought.
Increasing it is no problem; is that the reason – stress?
The diameter of the bypass pipe can be increased as long as the pressure meets the process requirements
I think a DN50 pipe is sufficient for this purpose. You believe that the damage is caused by the multi-stage pump operating at flow rates below its minimum level; have you considered the possibility that it’s caused by excessive flow rates? Both excessive flow causing vacuum and insufficient flow leading to pressure buildup can damage multi-stage pumps. So you need to check the outlet pressure to make a judgment.