Air Flow Rate
Air Flow Rate
(OP)
Hi, I need some help on what equations to used, I need to find the Air Flow Rate in a pipe. Air is compressed in a tank, it comes out in a pipe of 3" diameter then it goes thru a 1" orifice(length less than 1/2") and goes back to a 3" pipe. The inlet pressure is 35psi and oulet pressure is 27psi (controlled). Do I need the Length of all the pipe or what?, please help me with this problem by telling me what formulas and procedure to use, thank you very much.
the equations i am trying to use are:
v=((25000dp)/L)^(1/2)
Q=Av
What else do I need, how do I find the pressure loss do to pipe length,
thanks for your help.
EJ
the equations i am trying to use are:
v=((25000dp)/L)^(1/2)
Q=Av
What else do I need, how do I find the pressure loss do to pipe length,
thanks for your help.
EJ





RE: Air Flow Rate
I'd suggest you get a copy of Crane technical paper 410C (about $40), one of the best investments you'll make in your career.
ASSUMING you have a short length of 3" line, I got the following flowrates:
5' of 3" pipe, 1580 lb/hr
50' of 3" pipe, 1569 lb/hr
100' of 3" pipe, 1557 lb/hr
10 miles of 3" pipe (
RE: Air Flow Rate
EJ
RE: Air Flow Rate
All data is for a 3" diam pipe:
The pressure drop in inches of water at the listed air velocity per 100' of pipe:
Velocity....Pressure Drop
3500'/min....7.5" water
4000'/min...10.0" water
4500'/min...11.0" water
Airflow volume at 4500'/min = 220 CFM
RE: Air Flow Rate
It has NOTHING to do with the OP's question and is highly misleading.
RE: Air Flow Rate
RE: Air Flow Rate
RE: Air Flow Rate
I also dont have the pages A-23 and A-24 , I only have A-25, Is there anyway you can email me this pages, or tell me where to find them online,
thank you for you help
EJ
RE: Air Flow Rate
RE: Air Flow Rate
Crane Technical Paper 410C is a copyrighted document (which should have been clear to you when TD2K posted that it costs about $40).
It's one thing that your grasp of these concepts is remedial at best (I don't see how any mechanical engineer could not know k for air, or at least not know that you could easily find that in ANY fluids, heat transfer, or thermodynamics textbook), but requesting free copies of copyrighted documents is UNETHICAL.
Please refrain from such unscrupulous requests in the future.
Haf
RE: Air Flow Rate
Thanks