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ajs1972 Careful! Your concepts are flawed. The use of ppm in the context of gases means parts per million - a concentration by volume - not a concentration by weight. 40,000ppm = 4%. 4% of a 40m3 volume of gas air/hydrogen mixture = 1.6m3 of hydrogen. 1.6m3 x 0.08375kg/m3 (mass of H2...

Which function or reference would you use to calculate the mass flow rate at constant pressure but different orifice sizes?

What equation or reference did you use? 3 lbs of hydrogen gas (H2) occupies a volume of about 15,000L. One Mole of H2 = 2g, which will occupy 22.4 liters as stp. One pound = 0.453592kg Doesn't temperature AND pressure play a role if you go from a compresed gas @ 60 psi (gauge) to atmospheric...

In answer to mbt22 The pipe is 10cm long. I am not sure what you mean with converting all the pressure to velocity.

The Certifed Safety Professional (CSP) is a well regarded certification in the US and internationally. http://www.bcsp.org/

I trying to find a quick way to calculate the actual flow rate of hydrogen gas at the discharge point of a 1/8" (0.3175cm) pipe, if the pressure drop is from 74.7psi (515Pa) to 14.7psi (101.4Pa ambient air pressure). The compressed hydrogen gas is at normal room temperature.