Assume we have a pump that discharges to two branches , branch 1 and branch 2 which are in parallel . branch 1 has total head of 5 bar and needs flowrate = 10 m3/h , while branch 2 has total head of 2 bar and needs flowrate = 20 m3/h ,, so we choose a pump of H= 5 bars and Q= 30 m3/h ... we know that branch 1 is the critical user as it needs more head ... Now when the pump starts , the 5 bars goes to branch 1 and reached the end user , but the 5 bars that get in branch 2 reaches the end user 3 bars as 2 bars is lost to over come head and losses as I said above .. the end user at branch 2 needs pressure only of 1 bar so we installed a restricted orfice to decrease the pressure from 3 bars to 1 bar ,, The question is does this decrease in pressure affects either the flow rate in branch 2 which is 20 m3/h ,, or even does it affects the pump curve ? ( take in consideration that branch 2 is not the critical path or not the path of the largest head).
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