First off, I assume that PMP-1, PMP-2, PMP-3 are currently off. One idea is to attach all of the downstream pipes from the Pumps directly to the furthest discharge junction downstream of P-596. You will notice that the flows are correct if you add up, (P-127,P-617,P-619,P-627) compared with the discharge P-124. The issue is with the small connecting pipes. Try connecting the downstream Pipes directly to the common discharge junction. Dan
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