When sizing pipes, the following criteria are applied in determining compliance with UK and USA recommendations.
Non-corrosive water is assumed.
For large pipes, UK recommendations are a maximum flow velocity of 3 m/s and in the USA 4.6 m/s is recommended.
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UK Recommendations
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Pipe diameter <= 50 mm
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All pipes
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flow velocity >= 0.75 m/s and <= 1.5 m/s
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All pipes
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pressure drop >= 50 Pa/m and <= 350 Pa/m
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Pipe diameter > 50 mm
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All pipes
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flow velocity >= 1.25 m/s and <= 3.0 m/s
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All pipes
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pressure drop >= 50 Pa/m and <= 350 Pa/m
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USA Recommendations
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Pipe diameter <= 50 mm
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All pipes
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flow velocity >= 0.6 m/s and <= 1.2 m/s
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All pipes
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pressure drop >= 75 Pa/m and <= 400 Pa/m
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Pipe diameter > 50 mm
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Plastic pipes
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flow velocity >= 1.2 m/s and <= 1.5 m/s
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Steel, copper pipes
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flow velocity >= 1.2 m/s and <= 3.0 m/s
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All pipes
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pressure drop >= 75 Pa/m and <= 400 Pa/m
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