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If these two pressures are different, the water will be forced to move. And as the graph shows, water at 82 o C is about 1% less dense than the same water at 65 o C. This may not sound very much, but it's enough. The difference in the density of the water in the flow and return pipes is about 10 kg/m 3.
WATER FLOW THROUGH STEEL OR COPPER PIPE. Steel or copper piping is generally sized for water flow that will result in a friction loss of approximately 2 feet of water per 100 feet of pipe length and a velocity of 7 feet per second or less. This chart indicates the flow in GPM that a pipe size can generally handle: Pipe Size Â½ Â¾ 1 1 Â¼ 1 Â½ 2 2 Â½ 3 4 5 6 8 GPM Up to 1.5 2 - 3.5 4-7 8 - 14 15 - 22 23 - 40 41 - 70 71 - 120 121 - 250 251 - 450 451 - 700 701 - 1200 Adapted from: HVAC Technician's Handbook, LAMA Books, www.lamabooks.com