Dear All,
Why do the pump curve on Sewer Cad exceeds on the max. flow provided? Say, I input Max. Flow of 2600gpm but the end point of the curve shows 3100gpm? What are the reasons behind? Please Help!
Regards,
June
June,
We have a wiki technote that explains how the pumps work in our products and what this message indicates. Please let me know if you have any questions after reading it over.
communities.bentley.com/.../7698.a-pump-exceeds-the-maximum-operating-point-user-notificationis-shown-after-running-a-model.aspx
Mark
Answer Verified By: june_0809@yahoo.com
In other words, SewerCAD will extrapolate the pump curve (using a best fit curve) all the way to zero head on the right side and zero flow on the left side. If the pump ends up operating in these areas (between the defined pump curve and the extrapolated points), you'll get the message mentioned in the article that Mark referenced.
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.
Mark and Jesse,
I got it now! Thank you very much. I just have a follow-up question. If the pump operates beyond the defined curve, it means the pump was under-estimated? Right? So, the pump may experience overloading that may cause of its failure.?
Yes, It could me that your pump is too small for the system or it could mean that you have some data entry that is incorrect. Things to look for are incorrectly entered pipe diameters, elevations on manholes or wet wells, and/or conduit roughness coefficients.
Yes, a pump in this situation may experience overloading that may cause failure, as you have suggested.