When dealing with gas flow rates, normal condition, standard condition, and actual condition must be handled carefully.
Definition of Normal state and Standard state
Normal state is 0℃, 1 atm, and Nm3/hr units are usually used.
Standard state is 15℃ (60℉), 1 atm.
Example of Normal state and Standard state
Normal condition
Pn = 1 bar (=absolute pressure)
Tn = 0 ℃
Vn = 5000 Nm3/hr
Pn = 1 bar (=absolute pressure)
Tn = 0 ℃
Vn = 5000 Nm3/hr
Actual condition
Pa = 7 bar
Ta = 20 ℃
Va = ?
Pn*Vn/Tn = Pa*Va/Ta
Va = Pn/Pa*Ta/Tn*Vn
Va = 1/3*(273+50)/(273+0)*5000 = 1,972 m3/hr
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