General Pump Selection Process

Product(s): WaterGEMS, WaterCAD
Version(s): 10.XX.XX.XX, 08.11.XX.XX
Area: Modeling


What is the general process of using WaterCAD or WaterGEMS to select (size) a pump?


The general approach typically used to select pumps is:

1. Create the pipe network model
2. Insert a pump with a rough estimate of a reasonable pump head curve
3. Make some model runs, using reasonable peak demands.
4. Generate a system head curve
5. Obtain pump head curves for some likely pumps
6. Enter them in the model and see what their operating points are
7. Make sure they will be operating near their best efficiency point
8. Look at how they will be operated (on/off setpoints, continuous running) with an EPS (Extended Period Simulation) model
9. Perform some energy calculations to find the pumps with the best life cycle costs

Note: if you have a closed system with no downstream storage, there are some considerations with regard to viewing the system head curve. See article below.

See Also

Determination of Pump head

System Head Curves in WaterGEMS and WaterCAD

Energy Cost and Energy Management

Pump Selection for a Closed System

System head curves with no downstream storage (Solution 500000056093)