Gas Density

Forum about flow calculators available on and how to find solution for your fluid flow problem.
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Joined:Thu Oct 11, 2012 11:34 pm
Gas Density

Post by bouyscout » Thu Oct 11, 2012 11:49 pm

Using the Orifice Plate calculator to range an orifice plate for N2 service. The density of the gas that is calcuated doesn't seem to correlate with what I've calculated based on Temperature of 25 C, gas constant of 297 J/kgK and pressure of 2.07 bar. I calculated a density of 3.48 kg/m3 but the program states the density is 2.34 kg/m3. Finally determined my mistake was inputing gage pressure and not absolute. Did I miss something that tells us to use absolute pressure or is that just understood in gas flow and I'm being slow on the take-up?

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Joined:Mon Feb 08, 2010 7:47 pm

Re: Gas Density

Post by admin » Fri Oct 12, 2012 7:08 am

It's not you, you are one of many that make that mistake, so I will add it in more obvious place in next update.
Pipe flow calculations - since 2000

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