How to calculate the pipe diameter?
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A pipe for transporting water. It is known that the required flow rate is 20 T/h, and the required pressure is 0. 40MPA, how to calculate the pipe diameter? (The flow rate is required to be 1.5 m/s)
Through calculation, the theoretical diameter is 68.69
This post was last edited by aikesi on 2010-6-17 at 16:36. Reply to 1# Jiangtai Ren: The cross-sectional area is obtained by dividing the flow rate by the flow volume; from this, the diameter can be determined, and the pipe diameter (DN75) was chosen. It has nothing to do with pressure.
I’d like to ask the person above – is there any formula for this?
Reply to 4# Jiangtai Ren: First, convert the mass flow rate to a volume flow rate. 20 T/H = 20 m3/h = 20/3600 m3/h = 0.005556 m3/h. The cross-sectional area is then calculated as 0.005556/1.5 = 0.003704 (m2). The diameter is 0.068688 m = 68.688 mm; therefore, a pipe with a diameter of DN75 should be selected.
The calculations for the 4th floor are correct, but it is recommended to use DN100, mainly considering the flow restriction caused by the valve.
Reply to 1# Jiangtai Person: D=18.8*（flow rate/velocity）^1/2. Flow rate--m³/h, Velocity--m/s
If the water pipe is not very long, it is recommended to use DN80 pipes; if the pipe is long, DN100 pipes are suggested
I would like to ask what the meaning of this sentence is
Resistance loss is taken into consideration; however, the resistance loss in straight pipes isn’t very high. But if there are many fittings, then the resistance loss becomes significant. The longer the distance and the more fittings there are, the less pressure will reach the location where water needs to be delivered, and it won’t be 0.4 Mpa anymore