How is the flow rate of the pipeline purging gas determined?
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How is the flow rate of the pipeline purging gas determined? Or, knowing the pipe diameter, purge gas flow rate, and pressure, how do you calculate the gas flow velocity?
For pipeline purging, the flow rate is important, as it is through this flow rate that impurities are removed. The flow rates for different purging media vary; for example, the flow rate for steam purging is generally 60–100 m/s, 40–60 m/s for nitrogen purging, and 3–5 m/s for water flushing. Therefore, the flow rate of the purging medium can be determined by the flow velocity and the specifications of the pipeline.
In practice, how is this flow rate measured? Thank you. .
A simple calculation shows that the flow rate at the outlet (under atmospheric pressure) is v = F / (π * D * D / 4) / 3600. In practice, the purging speed is much higher than this theoretical value; this is also known from experience
Is the same speed used for purging the crystallization pipeline as well?