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Mar 09, 2004 · A 1000 gpm pump cannot move more than 500 gpm at 250 psi pump pressure, so that pressure won’t work. Let’s try 160 psi (200 psi pump pressure) divided by 17 = 9.4 psi or 694 gpm for 4 inch or 1201 gpm (the limit will be the 700 gpm rating of the pump at 200 psi… ................
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