| here is a better website that shows how the variables change per pressure: [ http://www.pipeflowcalculations.com/airflow/ ] The volumetric airflow input into the calculator is the cfm at normal conditions, i.e at standard atmospheric pressure. You'll notice that as you increase the input pressure, the velocity through the pipe decreases, because the volumetric flowrate into the pipe is being held constant, not the volumetric flow rate through the pipe. Turbo CFM is rated the same way...cfm input into the compressor at std conditions. These calculators also use cfm input at std conditions, which results in reduced cfm through the pipe as you increase the pressure, which explains the reduced pressure drop. Conventional logic wins
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