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Mar 09, 2004 · Final Answer is an ISO™ flow of 1,600 gpm at 20 psi. Other examples: A hydrant with 105 psi static, a residual of 80 psi and a flow of 1,350 gpm = 2,612 gpm at 20 psi or 2,600 gpm at 20 psi. A hydrant with 40 psi static, a residual of 5 psi and a flow of 550 gpm = 406 gpm at 20 psi or 400 gpm at 20 psi. FORM: 1. ................
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