Maximum Acheivable Air Flowrate in a Discharge Line

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dtl
Posts: 1
Joined: Wed Jan 04, 2012 1:10 pm

Maximum Acheivable Air Flowrate in a Discharge Line

Post by dtl »

Hello,

I need to calculate the flowrate of air down a 20m long 2" ID discharge line, connected to a large pipeline pressursed with air at 20 barg.

Which calculator can I use to determine the maximum air flowrate down the 2" line when it is fully open; ie the air pressure at the inlet is 20 barg and at the outlet is 0 barg?

Thanks
PipeFlowCalcs
Posts: 57
Joined: Sat Sep 17, 2011 8:50 am

Re: Maximum Acheivable Air Flowrate in a Discharge Line

Post by PipeFlowCalcs »

I am at the moment working on one that will be for this purpose - gas discharge and I hope to finish it in following weeks.
Here are results based on your data:
1. pressure in position 1 (p1):
p1 : 2101325.0 Pa

2. pressure in position 2 (p2):
p2 : 101325.0 Pa

3. pressure drop (p1-p2):
p1-p2 : 2000000.0 Pa

4. tube diameter (D):
D : 2 in

5. volume flow rate (q1):
q1 : 616.1799 m3/h

6. weight flow rate (w):
w : 15664.8545 kg/h

7. velocity (V1):
V1 : 84.44774 m/s

8. expansion factor (Y):
Y : 0.6958646

9. Reynolds number in front of orifice (ReD):
ReD : 6304120.0

10. temperature (T1):
T1 : 288 K

11. density (ρ1):
ρ1 : 25.422535 kg/m3

12. gas constant (R):
R : 287 J/kgK

13. K factor - minor losses coefficient (K ):
K : 1.5

14. friction coefficient (f):
f : 0.023341563

15. pipe length (L):
L : 20 m

16. kinematic viscosity (ν):
ν : 0.68049866 mm2/s

17. dynamic viscosity (μ):
μ : 17.3E-006 Pas

18. pipe roughness (kr):
kr : 0.1 mm

Note that q1 is volume flow rate at p1 and T1. To have volume flow rate on standard conditions more calculation is required: q=12779 m3/h on p=101325 Pa and T=288 K.

These results are based on the equation on maximum flow rate calculation page.
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