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Why are my fixed flow VSP pumps providing more flow than I have specified as the flow(Target) in the properties?

   
  Applies To 
   
  Product(s):
Bentley WaterGEMS, Bentley HAMMER, Bentley WaterCAD
  Version(s): 08.11.XX.XX
  Environment:  N/A
  Area: 
  Original Author: Mark Pachlhofer, Bentley Technical Support Group
   

Problem

Why are my fixed flow VSP pump(s) providing more flow than I have specified as the flow(Target) in the properties?

Solution

Look at the hydraulic grade of the pump(s) vs. the hydraulic grade of the downstream elements.

 

If the hydraulic grade at the pumps is higher than the downstream hydraulic grade then it means the pumps need to operate at a higher flow rate because the flow could really be transferred by gravity. In many cases the pumps may be showing operating at the zero head point or a near zero head point.

 

  • Created by
  • When: Wed, Jun 17 2015 2:28 PM
  • Last revision by
  • When: Tue, Apr 12 2016 4:45 PM
  • Revisions: 2
  • Comments: 0
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