Where:
deff = effective leak diameter, in inches, expressed to at least two decimal places.
QN2= volumetric flow of nitrogen, in m3/s.
pin = inlet pressure to orifice, in kPa.
patmos = atmospheric pressure, in kPa.
SGN2 = specific gravity of N2 relative to air at 101.325 kPa and 15.5 °C = 0.967.
T = temperature of flowing medium, in K.
Example:
QN2= 0.8·10-5 m3/s
pin = 104.294 kPa
patmos = 101.332 kPa
SGN2 = 0.967
T = 298.15 K
deff = 0.017 inches
40 C.F.R. §1066.985