Calculation of pump inlet diameter
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I would like to ask everyone: I know that the flow rate of the circulating pump is 60 M3/H. How should I calculate the diameter of the inlet pipe for my design?
You can refer to the selection samples from several pump manufacturers; the inlet pipe diameter should be between DN80-100mm
It needs to be calculated based on the viscosity of the material; different viscosities result in different flow rates, and thus different pipe diameters
The default medium is water at a normal temperature of 20°C, with d=18.8 (Q/v)^0.5; the flow velocity in the inlet pipe ranges from 1 to 1.2 meters per second, resulting in a value of d=147. Therefore, a diameter of DN150 is chosen, while the exit flow velocity is generally between 1.5 and 2 meters per second. The pipe diameter is: d=104; DN100 or DN125 can be used, although DN125 is not recommended. It is possible to directly change the diameter at the outlet to DN150
The recommended values can be found on page 214 of the \"Industrial Pump Selection Manual\" (2nd edition)