In the case of a pump with a flat head vs flow curve at low flow rates which is not its b.e.p. is it possible to reliably operate the pump in this area for short periods of time? I know it is not ideal or good for the pump to do this because of recirculation and possible damage, but is the flow rate from the pump even controllable based upon a steep system resistance curve and a nearly constant head discharge across this low flow rate region of the curve? To my understanding the pump will drop and surge in this area, basically flow hunting.
This is true, however, I don't have the ability to utilize a bypass line.
If the rotate speed of pump is lower, the flow is lower but the pressure may be lower according the flow curve.
As you say, it is not good for a pump's life to run that way, but provided the Head-Flow curve is steadily falling: i.e. no hump in it - then I think it can be run like you say. Your q was several months back- what did you do?
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