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Simplified Pipe/Pump Sizing Chart (Copper Tubing)

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Pipe Size BTUH Friction Head Feet 100’ (straight pipe) Friction Head Feet 100’ (allowance for fittings and boiler) Gallons per Minute (GPM) at 20 degree Delta T 1/2” 17,000 4.2’ 6’ 1.7 3/4” 39,000 4.2’ 6’ 3.9 1” 71,000 4.2’ 6’ 7.1 1-1/4” 160,000 4.2’ 6’ 16.0 1-1/2” 240,000 4.2’ 6’ 24.0 2” 450,000 4.2’…