I am trying to figure out the flow rate of nitrogen through a 1" line.  I have a high pressure (40 lb) nitrogen flowing in a 1" line.  Can anyone direct me in finding charts that would correlate pressure of a certain line size with expected N2 flow rate.  Or perhaps guidance into pressure and flow rate realtionships. 
Here is what I basically did already...but i'm not sure if I am correct, the flow seems a bit too low ??!

Line Diameter : 1 " (.0254 m)
Line Length : 934 "  (28 m)
Volume = L*A = 934*.25*pi*(.0254^2)=.012 m^3

using the Ideal Gas Law :
Mass(kg)
Press (Pa)=40 psi *6894.757 Pa/PSI = 275790.3 Pa
Volume (m^3)=.012
R (Pa.m^3/Kg.mol.K) = 8314.3
T (ambient)(K)= 298
M (Molec. Weight) (Kg/Kg.mol)=28.0134

Mass=[(press*Volume)/(R*T)]*M)=.037 kg

Once I have my Mass, since I don't have two pressures because this 40 lb pressure is constant than can I assume that my mass flowrate to be the mass that I calculated per second ?
if so then it would be .037 Kg/s

and then I would divide this by my density= 1.185 kg/m^3 (at at 1 bar 15 deg C)and this will give me my Volumetric Flow Rate of 0.032 m^3/s

Can anyone tell me if I am doing this accurately or if I am making some mistakes...I am actually a mechanical engineer and havn't had too much experience with the ideal gas law.

Assuming your pressure is absolute pressure, you seem to have calculated the mass of N2 in the line successfully. This has no relationship to the flow however. As you say you have no pressure drop, you actually imply that there is no flow.

It might help to say what your line goes to and/or where it comes from. Is it flowing freely to the air? Does it feed a piece of equipment running at 40psia? Does it feed a regulator? Is this the branch line off a header?

I think it is cool that mechanical engineers can get some simple help like this in the forum, but you must provide a little more detail. Best of luck, sshep

p.s. most engineers in this forum wouldn't consider 40 psia very high pressure.

Compressible flow problems can be complex and very frustrating.  Is it isothermal flow, or is it adiabatic flow?  Which one of these two