BADU Pipe characteristics
The following graphic will help you when determining pipe friction characteristics and calculating the correct pipe diameters.
Circulation pumps
Example
Q = 25 m³/h, 20 m plastic pipe with DN 50 ≙ d 63: DN 65 ≙ d 75
Expected loss reading as seen in the table (Hv = 18.00 m per 100 m): 5.00 m per 100 m
Expected loss
20 m pipe (x 10/100) (Hv = 3,60 m): 1.00 m
Monitored flow speed (v = 3.40 m/s – too high): 2.00 m/s – acceptable
The pressure loss in this example is valid for clear water at 20 °C and for liquids of similar kinetic viscosity and for new PVC U-pipes.
Pressure loss (mWS)/Flow rate Q (m³/h)
Counter swim units
To achieve an almost loss free operation of counter swim units use the table below to dimension the pipe diameter.
The example is based on:
Suction line (S) with two elbows and the pressure line (D) with three elbows.
Q (m³/h) | Length of pipe | |||
5 m | 7.5 m | 10 m | ||
45 | Suction line (S) | d 125 | d 125 | d 125 |
Pressure line (D) | d 125 | d 125 | d 125 | |
58 | Suction line (S) | d 140 | d 140 | d 140 |
Pressure line (D) | d 140 | d 140 | d 140 | |
75 | Suction line (S) | d 160 | d 160 | d 160 |
Pressure line (D) | d 140 | d 140 | d 140 |
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