How to calculate linepack
How to calculate linepack
(OP)
Does anyone know how to compute linepack in a natural gas pipeline? I can't seem to match by hand what is being reported in several simulation programs...thanks for the help!
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RE: How to calculate linepack
Does the simulation programs produce radically different results?
Best regards
Morten
RE: How to calculate linepack
Repeat for the final conditions. The difference between the two is your line pack.
As Morten says though, how much difference are you seeing?
RE: How to calculate linepack
The answers between the 2 programs are similar, but about 40% off from my calculation, which is more of a volume calculation.
Well, how about this...how much gas would you calculate to fill and start a pipeline? Would you use the lowest operating pressure or the highest operating pressure?
RE: How to calculate linepack
However: I think that if you procedure would be to add gas to a pipeline initially at atmospheric pressure - with a closed downstream valve until the entire pipeline has a certain pressure - then a simple mass balance should tell you how much gas is needed. You can use a SS process simulator such as HYSYS for this or even a hand calculation.
Best regards
Morten
RE: How to calculate linepack
Anyway, I think you are right about filling the pipeline...thanks!
RE: How to calculate linepack
You may want to refer to the AGA's "Gas Measurement Manual" Catalog No. XQ1081 for these calculations.
Hope this helps