Dear Mall Please have a look at attached model. You are right. After running the model there will no any eproblem occur and every thing go well. A question remains is that if ‘assigning negative demand to the junction’ works like a sufficient pump? After inserting a sufficient pump, you would see the HGL of junctions are similar to HGL of junctions before inserting pump. What does ‘Negative Demand’ work and how it affect on other junctions’s pressures? Sim
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