How can i model Two VSPB's in parallel way with different pump curve in watergems projects?

Passing this to the OpenFlows Forum for support of the WaterGems software.

Hello Mohammad, 

Can you please confirm if you want to model variable speed pumps i.e. VSP's or variable speed pump batteries i.e. VSPB'S in parallel in WaterGEMS with different pump curves? 

VSPB consist of multiple VSP's meant to be modeled as parallel VSP's, which will have one pump definition in common and common control node. 

See below articles which specifies use of VSPB in WaterGEMS. 

Benefits of using variable speed pump batteries (VSPB) element and how it works

How many pumps do you have in your pump station? 

Please note that modeling parallel variable speed pump batteries are not allowed in WaterGEMS. If you want to model it as parallel VSP's with different pump curves then, workaround is provided in below wiki, please go through it. 

Modeling variable speed pumps in parallel with different pump curves