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# Copper Tubes - Pressure Loss vs. Water Flow

Water flow in copper tubes types K, L and M according ASTM B88 and pressure loss (major loss) due to friction:

Download the diagram as pdf-file: Pressure Loss in Copper Tubes ASTM B88 - Type K

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Water velocity in copper tubes should not exceed 8 ft/s (2.4 m/s) for cold water and 5 ft/s (1.5 m/s) for hot water (up to approximately 140oF, 60oC). If water temperatures routinely exceeds 140oF - don't exceed 2-3 ft/s (0.6-0.9 m/s).

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Pressure losses are calculated with the Hazen-Williams equation and a roughness coefficient c = 145.

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