PRESSURE LOSS CHARTS: STEEL, COPPER, PEX A summary of pressure loss data for piping comes from ASHRAE. The figures below show pressure (friction) loss for steel pipe, copper pipe, and plastic pipe. PEXa resembles plastic pipe, so the figures are generally accurate.
Reproduced from ASHRAE. (2009). Pipe Sizing. In Fundamentals (p. 22.7). Atlanta, GA
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Hydronic System Design Manual ©DECTRA CORPORATION - March 2013
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