What should be the diameter of the main pipe when 3 DN125 vacuum tubes are connected in parallel? Urgent!
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There are 3 DN125 pipes, each connected to a NASH 2BV5 vacuum pump (600 m3/h). These 3 pipes are connected in parallel to a main pipe. I would like to know what diameter the main pipe should have to meet the requirements The operating condition is a gas containing water (i.e., high-temperature steam); the temperature is 105 degrees. The actual vacuum level in the pipeline is -0.07 Mpa, while the design value is -0.1 Mpa. Expecting help from a strong person; urgent! Urgent! Urgent!
In engineering, it is recommended that you use the equal velocity method for calculation, which will meet the requirements. Choosing a DN250 pipe will suffice. For your reference
I think DN200 is sufficient
For the liquid phase, the cross-sectional area of the main pipe we use is 1.2 times or more of the total cross-sectional area of the branch pipes; in the gas phase, the cross-sectional area of the main pipe must be greater than that of the branch pipes
It can be calculated by assuming equal cross-sectional areas.
Calculate based on equal flow velocity and the same cross-sectional area