Questions about pipeline flow calculation
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The calculation formula for pipeline flow is: P1V1/T1=P2V2/T2 P1 is 1MPA ； V1 is the volume flow rate under standard conditions ； P2 is the medium pressure ； V2 is the volume flow rate under medium pressure. The formula can generally be simplified to: P1V1=P2V2 For example, now I have a DN1400 gas pipeline with a working pressure of 5~7KP and a flow rate of 9m/s. How to calculate V1.
First, calculate the volume flow rate based on DN1400 and a flow rate of 9m/s. V2=3.14/4×di×di×9. The approximate calculation can be assumed to be an ideal gas, and then use the formula P1×V1/T1=P2×V2/T2. Note that T is the absolute temperature, T=273.15+t. Your calculation method does not consider the temperature factor, and the results may vary greatly! !
Calculate the volume flow rate when the flow rate is 9m/s. V2=3.14/4×di×di×9. Volume flow is not pipe cross-sectional area * Flow rate? Why does it need to be divided by 4 over there?