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Mar 09, 2004 · Step 6: To get the final flow at 20 psi residual multiply the sum of step 5 by the gpm flow. Example: 1.244 x 1,250 gpm = 1,555 gpm at 20 psi residual. Step 7: Round to the nearest 50 gpm for flows under 1,000 gpm and round to the nearest 100 at flows . above 1,000 gpm. Final Answer is an ISO™ flow of 1,600 gpm at 20 psi. Other examples: ................
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