Hi Patrick

Thanks for your response, I have done the checks as you suggested. I should have mentioned in my post that for this system there are 2 pumps which operate in parallel. As per your point 1 above, I have now modelled a 'dummy' pump, which represents the combined 2 duties, and the resulting system curves are as I expect.

I would like to understand more about why my initial approach did not work. The two parallel pumps are set up with the same controls so they run at the same time. When I produce the system curves for a single pump for the EPS varying times is it the second pump operation which is interfering with the system curve, causing the unusual shape? Or does the model know to turn the other parallel pump off? (I've included below the system curve outputs for my initial approach and revised approach).

The suite extension that you mention "Pump System Analyst", is this available in H2OMap? Please let me know if I should email the support team or whether this can be addressed here.

**Initial approach **(single pump selected for system curve output) System Curve Results:
Pump curve 1 - inital approach.jpg

Revised approach (combined pump curves) System Curve Results

Combined pump curve.jpg
Thanks,

Gina