Could an expert help me calculate the flow rate and pipe diameter for the Supervisor?
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The main pipe splits into five branch pipes, each with a nominal diameter of DN50. The flow rate for each branch pipe is 8 cubic meters per hour. What would be a suitable nominal diameter and flow rate for the main pipe when all these branch pipes are in use simultaneously? How is it calculated exactly?
If all 5 branch pipes are in operation at the same time, the flow rate in the main pipe should be 5x8=40 cubic meters per hour. Assuming the flow velocity in the pipe is around 1.2 m/s, the diameter of the main pipe can be calculated using the formula Q=0.785D² Xu; from this, D comes out to be 108. Therefore, a pipe with an outer diameter of 133 can be used
A DN100 pipe is sufficient, as the flow rate on this pipe is 5x8=40, resulting in a flow velocity of 1.5 m/s, which fully meets the requirements.
The principle behind the calculation is the material balance mechanism
As mentioned above, is the flow rate of the main pipe the same as that of the branch pipes?
Generally, the larger the pipe diameter, the flow rate can be increased appropriately within the allowable range; thus, the flow rate in the main pipe can be slightly higher than that in the branch pipes.
A flow rate slightly higher than that specified in all design manuals is fine; don’t be rigidly bound by the design manuals, as those values are conservative
So, what is the typical flow rate of water vapor?
I’ve done the calculations; DN100 will suffice