How to calculate pipe diameter
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Could everyone help calculate this: It is necessary to transport 1500 m3/h of carbon dioxide under standard conditions. First, it needs to be pressurized to 0.8 MPa using a compressor, and then sent to a reactor located 1 kilometer away. What diameter and type of pipe should be used?
The flow rate is 10–15 meters per second; with a pressure of 0.9 Mpa gauge pressure, and accounting for the compression coefficient, the actual volume is approximately 100 cubic units. The minimum pipe diameter required is DN60. Given that the pipeline is relatively long and this results in increased resistance, it is necessary to use pipes with a diameter of DN80
The gas velocity should be set at 20 meters. DN80
Follow-up question: Using the formula P1V1/T1=P2V2/T2, I want to convert 1500 M³/h under standard conditions to P2=0.8 MPa (gauge pressure). I would like to know whether P1 should be set at 0.1 MPa or 0.2 MPa. Does 1 atmosphere under standard conditions refer to gauge pressure or absolute pressure?
Follow-up question: Using the formula P1V1/T1=P2V2/T2, I want to convert 1500 M³/h under standard conditions to P2=0.8 MPa (gauge pressure). I would like to know whether P1 should be set at 0.1 MPa or 0.2 MPa. Does 1 atmosphere under standard conditions refer to gauge pressure or absolute pressure?
At standard conditions, the atmospheric pressure can be considered as 0 or 1 atm; the former refers to gauge pressure while the latter refers to absolute pressure. Gauge pressure is a concept introduced in engineering to facilitate description by comparing it with atmospheric pressure. Absolute pressure is used in all calculations, and attention must be paid to the units.
At standard conditions, the atmospheric pressure can be considered as 0 or 1 atm; the former refers to gauge pressure while the latter refers to absolute pressure. Gauge pressure is a concept introduced in engineering to facilitate description by comparing it with atmospheric pressure. Absolute pressure is used in all calculations, and attention must be paid to the units.
Follow-up question: Under standard conditions, V1 = 1500 (with P1 = absolute pressure of 0.1 and T1 = 273 + 0). When these values are converted to gauge pressure of 0.8 (with P2 = absolute pressure of 0.9 and T2 = 273 + 25), what is V2? The value obtained on the second floor was 100, but using the formula P1V1/T1 = P2V2/T2, I calculated that V2 should be 181.9
Your calculation is correct; the actual volume is around 180 cubic units, and a pipe diameter of 80 should also be sufficient
Your calculation is correct; the actual volume is around 180 cubic units, and a pipe diameter of 80 should also be sufficient
I majored in electrical engineering, but my boss told me to deal with process-related tasks. I have no idea who is doing things incorrectly here – why was 80 chosen instead of 180 cubic units? Is there any calculation process for this? Thank you so much!