How is the minimum flow line of a centrifugal pump configured in terms of piping? ?
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How is the minimum flow line of a centrifugal pump configured in terms of piping? ? 1. I have a centrifugal pump with a flow rate of 32 m3/h and a head of 40 M. Generally, a low-flow line needs to be installed when the flow rate is below 30% of the maximum value. Now I want to operate the pump at a flow rate of 5 m3/h. So, is the flow rate for the low-flow line equal to 30*0.3–5 = 4 m3/h? Should the diameter of the pipe for the low-flow line be calculated based on a flow rate of 4 m3/h? ? ?
Centrifugal pumps all come with hydrodynamic test curves provided at the time of manufacture; these curves show the minimum flow rate. The minimum flow line can be set according to this minimum flow rate value. If there are no curves, setting it at 30% will also work; just use a larger margin.
Choose the higher value, not the lower one; in fact, that’s how the diameter is usually selected.