Hello Bushra, It appears that the issue is related to the pumps pumping against a tank that is full. The pump status is still on, but this the pump is full (and there is no demand in the system), that this is causing the system to be unbalanced. I would recommend one of two things here. First, if the concern is with the EPS run, I would include controls for the pump. The pumps would turn on and off based on the level in the downstream tank. You can find more information on controls in the Help documentation or the following link: communities.bentley.com/.../2567.creating-controls-conditions-actions-and-control-sets-tn . Including controls may help in this as the pumps will turn off and no longer supply flow to the tank when it is full. That said, with no demands in the system, I don't see how the tank will be expected to drain. If there are demands in the system they should be included as well. If not, controls on the pumps will likely turn the pumps off and they will remain off for the rest of the EPS run. Given that this appears to be a HAMMER model, another option would be to replace the tanks on the upstream and downstream side of the pump station with reservoirs. There are a couple of reasons for this. First of all, the system balances during the EPS run since the reservoir element will not become full like the tank. Second, during a transient simulation the level in the tanks one either side of the pumps will not fill or drain much during the time frame generally used in a transient run. This makes replacing the existing tanks T-3 and T-4 with reservoirs a viable option. Regards, Scott
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