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Thanks, CMA I used API 521, and the got the Mach number 0.466. the pressure drop is almost same, around 3.8 Kpa. http://files.engineering.com/getfile.aspx?folder=4a5fef74-c780-4e88-9120-9b2b776ca882&file=Built_-_Up_Back_Pressure.xlsx

Good Job, Latexman. I did get that wrong equation from Wikipedia. It shows the correct equation now.

Letexman, Thanks a lot! Yes, after I change 3.6 to 1.8, (2) gives a consistent result. Thanks for the good and quick advice! Jasmine

There it is. The excel filehttp://files.engineering.com/getfile.aspx?folder=1ba37f9e-f976-4955-9a75-1e620e21d32c&file=Comparison.xlsx

Hi Latexman, Thanks again for your quick reply. It is a 3 in NPS venting pipe with 2 meter long I found a error in my calculation before. Now I got three different results: (1) using D-W, read friction factor from Moody Chart (0.015), I got 3809 Pa pressure drop (2) using D-W, calculate...

Thanks for the reply. I used the D-W equation. For 2 m pipe, 1884 scfm and I got the pressure drop to be 3.1 KPa. I also used Panhandle A equation, and the pressur drop 0.02 KPa. What might be wrong in my 2 calcuations?

This is a natural gas PSV. Though the discharge is to atmosphere, there will be little increase in back pressure on PSV. I remember there is an equation to calculate this. Can anyone please give me a hint? Thank you!!