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msmalik
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Join Date: Sep 2012
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Pipeline Purging with Nitrogen Gas

09/05/2012 7:22 AM

@ normal ambient condition "How much Nitrogen Gas required to fill 1 cu.m of Pipeline?

I need to calculate nitrogen gas required to purge 11 km of pipeline, 40" dia. I will take all the contigencies and wastages so i have a very simple question. plz reply soon

Regards,
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Pathfinder Tags: Nitrogen Gas for Pipeline Purging
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PWSlack
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#1

Re: Pipeline Purging with Nitrogen Gas

09/05/2012 7:25 AM

A1: 1e0m3

A2: 3.2e4m3 would fill it, though it may need a bit more than that to purge it, depending on the nature of the substances in the line and their maximum desired levels at the end of the purge sequence, which details have not been shared.

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msmalik
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#2
In reply to #1

Re: Pipeline Purging with Nitrogen Gas

09/05/2012 7:28 AM

Please explain your answer a little bit.
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PWSlack
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#3
In reply to #2

Re: Pipeline Purging with Nitrogen Gas

09/05/2012 7:30 AM

What is the volume of the pipe?

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msmalik
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#4
In reply to #3

Re: Pipeline Purging with Nitrogen Gas

09/05/2012 7:38 AM

Volume of pipe = 8913 cu.m

Pipe dia = 40"

Length = 11 km
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PWSlack
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#5
In reply to #4

Re: Pipeline Purging with Nitrogen Gas

09/05/2012 7:52 AM

A2a: correction - 8.9e3m3.

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msmalik
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#7
In reply to #1

Re: Pipeline Purging with Nitrogen Gas

09/06/2012 12:32 AM

Please give me breakup of your calculation or formula which you applied.

Thanks
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Joshi
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#6

Re: Pipeline Purging with Nitrogen Gas

09/05/2012 8:58 AM

If you are in a hurry, just inject N2 in the pipeline from one end, vent it out in the other end, keep continuous flow of N2 until the O2 content drops to <5%.

The 2nd way is to pressurize the pipeline with N2 up to 80 PSIG and depressurize it to 5 PSIG. continue pressurizing and depressurizing until the O2 content drops to <5.

You can apply the ideal gas equation for this calculation.
P1V1 = P2V2 (but volume are the same)
Also, the O2 is 21 volume %..............
Then you can know how many times you need to purge

Further study material:

http://www.egpet.net/vb/threads/53290-Purge-pipe-line
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msmalik
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#8
In reply to #6

Re: Pipeline Purging with Nitrogen Gas

09/06/2012 1:04 AM

I am sorry, nobody could reply properly according to my question.
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Joshi
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#9

Re: Pipeline Purging with Nitrogen Gas

09/06/2012 2:08 AM

Do you need spoon feeding or ...

1. "How much Nitrogen Gas required to fill 1 cu.m of Pipeline?"

A: 1 M3

2. "11 km of pipeline, 40" dia." --Volume?

A: 8918 M3

By the way, why can't you sail with MKS units only. Why do you have to mix up with British units?
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