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Calculating Gas Composition In Natural Gas Line

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#1 mosa


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Posted 23 July 2020 - 02:28 PM



I have natural 36" Natural Gas(NG)  pipeline of 5 kms. Post maintenance works followed by  commissioning with  Nitrogen at 0.2 kg/cm2g. If we commission the 36"pipeline with NG ( C1 - 96.1mol%, c2-2mol%,c3 - 0.1 mol%, co2 -0.345mol% and N2 -1.5mol%), what is the final composition of the NG+N2 mix when pipeline is pressurized upto 40 kg/cm2g. Assume flowrate to consumer is zero. 

#2 demank


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Posted 31 July 2020 - 01:37 AM

Your query seems not clear for me.

Do you mean pressurize Pipeline with Natural Gas?

and the sum of the composition of your NG is not 100%.

Btw, you can calculate by yourself with common equation P1V1/T1 = P2V2/T2. mass original + mass additional = final mass.

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