I think I have not introduced my problem clearly. My closed system is a closed loop system. i.e the pump is used to circulate the water in a closed loop only against the losses & pressure drops in valves. There are no demands. All elevations are set to zero in the flex table. I would like also to know how does watergems calculate the system head curve for a combination of pumps in a pump station ? Does the program calculate the head loss for the corresponding maximum flow from the pump prespective (in other words , does the program consider the maximum flow as the flow of the downstream pipe of the selected pump? )
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