how to calculate volume of nitrogen neded to fiil 27 km of pipe line 12 pouce 1

[maatoug]

hello

how to calculate volume of nitrogen neded to fiil 27 km of pipe line 12 pouce at 0.3 bar

 

[1503-44]

Use the ideal gas law for low pressure nitrogen.

https://www.calculatorsoup.com/calculators/physics/ideal-gas-law.php

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[LittleInch]

Just remember to use absolute pressure and temperature.

Are you purging the whole line?

Allow at least 10% extra volume to sweep out all the air.

And find out what the ID is.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[maatoug]

hi,

yes i m purging th whole line in order to preserve it untill phase 2 , not for gas in ,

thanks

 

[EdStainless]

Do you have dew point and oxygen targets that you need to hit?
You should if you actually want to preserve it.
And it will take a lot more than 10% extra.
Usually people purge with warm dry air first to remove moisture.
Then you can nitrogen purge to get the oxygen down.
If you need to get under 4% oxygen you will need about 2.5x the static volume.

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P.E. Metallurgy, consulting work welcomed

 

[pierreick]

H,
To add to the discussion, I will use a calibrated sensor to monitor the residual O2 at the discharge. Don't rely only on calculation.
You will find some calculation in the document attached.
Pierre

 

[LittleInch]

Using nitrogen to dry the line is expensive and wasteful. Get the line dry first then use N2 ti inert it.

Preservation can take many forms....





Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[maatoug]

thanks for all ,

Using nitrogen is expensive but my line will work after 3 years at least (phase 2 ) for that i cant leave it without nitrogen , i used dry air with acceptable dew point -14 . after i m gonna to preserve it with nitrogen.

i wonder how to calculate the volume of N2 in liter for 27 km of 12 inch ?

 

[LittleInch]

Internal square area in m2 x 27,000 m will give you a volume in cubic meters. 1m3 is 1000 l.

find a calculator.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[EdStainless]

But do you have an O2 limit also?
I can't believe that you would just fill it and be at about 10% O2 and call that good.
This is just a dilution problem.

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P.E. Metallurgy, consulting work welcomed

 

[LittleInch]

Oxygen isn't the real issue,

Water is.

No water, no corrosion or negligible quantities but nitrogen will help as long as you maintain positive pressure.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.