Amount of gas blown off: Easy to remember formula

Here is an easy to remember formula to estimate the amount of gas blown off through an opening in the pipe:

Q=D^2.P.t/60

(in words D square PT by sixty…Isn't it easy to remember? :))

Now remember this as well…:D…which I suppose is quite standard.

Q = Volume of gas at 15 Deg C and 14.7 psia, SG = 0.6
D = Diameter of opening in inches (Orifice, pipe, nipple etc.)
P = Pressure in psia at some nearby point upstream of opening
t = Time of flow in minutes

That’s it!.. and you can estimate the gas lost through venting or valve opening!

Let there be Light Gas!