Run-out condition
Run-out condition
(OP)
Please any pump expert explain the term of run-out condition? How it has been occured? and Does it have a criteria to select the max.flow rate, normal and min.flow rate for pump to operate?
Thanks in advance.
Thanks in advance.





RE: Run-out condition
Safe minimum flow rate is decided by the manufacturer. Normal flowrate is what you require presently. Maximum flowrate is the extra capacity you should have incase of future expansion or for transient requirement.
RE: Run-out condition
Quark.
What i mean is that at the point where pump performance curve and system curve meet together, Is that point is the flow rate that will receive when we operate that pump? and does it have a criteria to choose where to determine the design flow rate? At that design flow the control valve will absorb the pressure drop, How can I know the suitable point to select for design case? I just wonder and please explain more!
RE: Run-out condition
The pump manufacturer provides a set of performance curves for a range of drive speeds and sometimes a range of impeller diameters. Superimposed on that you should find roughly elliptical curves representing the loci of constant efficiency operating points. It's customary, absent other constraints, to target your system's operaing point(s) somewhere within the highest efficiency region.
Mike Halloran
Pembroke Pines, FL, USA
RE: Run-out condition
examine all possible operating points to evaluate your design!
RE: Run-out condition