Maximum gas flow calculation

Forum about flow calculators available on pipeflowcalculations.com and how to find solution for your fluid flow problem.
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rando5811
Posts: 2
Joined: Fri Sep 30, 2011 2:52 pm

Maximum gas flow calculation

Post by rando5811 »

Hello,

My computer is having issues with the online calculator. Need simple max. volume calculations for natural gas flow in Mcf per day for following scenarios (gas analysis attached):

Pipe: HDPE SDR-11 gas line
ID: 2.825 in.
Length: 10,000 ft.
Elev: 700 ft.

Scenario #1 (w/o compression)
Max. Inlet: 50 psig
Min. Discharge: 5 psig

Scenario #2 (with compression)
Max. Inlet: 150psig
Min. Discharge: 5 psig

Much appreciated,

Randy

P.S. Great resource for quick calculations in the field (thanks!)

http://www.kentuckynaturalgas.com
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PipeFlowCalcs
Posts: 57
Joined: Sat Sep 17, 2011 8:50 am

Re: Maximum gas flow calculation

Post by PipeFlowCalcs »

Here is report for your scenario 1:

Compressible natural gas flow calculator

1. volumetric flow rate (q):
q : 460.8046 ft3/min


3. length (L):
L : 10000 ft

4. diameter (D):
D : 2.825 in

5. density (ρ):
ρ : 0.78 kg/m3

6. temperature (T):
T : 288 K

9. pressure on the pipe start (p1):
p1 : 64.695432 psi

10. pressure on the pipe end (p2):
p2 : 19.695436 psi

11. pressure drop (p1-p2):
p1-p2 : 45 psi

12. velocity at the start (V1):
V1 : 12.879997 m/s

13. velocity at the end (V2):
V2 : 42.30813 m/s



And for scenario 2:

1. volumetric flow rate (q):
q : 1346.5756 ft3/min


2. mass flow rate (w):
w : 1784.5172 kg/h

3. length (L):
L : 10000 ft

4. diameter (D):
D : 2.825 in

5. density (ρ):
ρ : 0.78 kg/m3

6. temperature (T):
T : 288 K

9. pressure on the pipe start (p1):
p1 : 164.695432 psi

10. pressure on the pipe end (p2):
p2 : 19.69543 psi

11. pressure drop (p1-p2):
p1-p2 : 145 psi

12. velocity at the start (V1):
V1 : 14.785015 m/s

13. velocity at the end (V2):
V2 : 123.63397 m/s


Note that pressures are absolute values
Pipe flow calculations - free fluid flow calculators
rex
Posts: 1
Joined: Wed Feb 29, 2012 4:17 pm

Re: Maximum gas flow calculation

Post by rex »

Dear All,
Last edited by rex on Thu Mar 01, 2012 12:17 am, edited 1 time in total.
PipeFlowCalcs
Posts: 57
Joined: Sat Sep 17, 2011 8:50 am

Re: Maximum gas flow calculation

Post by PipeFlowCalcs »

Pipe size can be calculate if:
You know flow velocity or
You know pressure drop through pipe.

Also you should know fluid density. I expect that fuel gas is 0.78 m3/kg at normal conditions and lube oil is 850 kg/m3, but you have to confirm.

You can use flow rate and pipe diameter calculator for your calculation, but for gas enter density at pressure and temperature at real conditions.

If you do not know velocity, recommended values are for gas up to 20 m/s and for oil 1 m/s, but it depends on available pressure.
Pipe flow calculations - free fluid flow calculators
rando5811
Posts: 2
Joined: Fri Sep 30, 2011 2:52 pm

Re: Maximum gas flow calculation

Post by rando5811 »

Thank you for the additional information and clarification ~ much appreciated!
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