2 replies to this topic

Hi Everyone;

As you know, Nitrogen is one of the best purging gas in gas refinery plant.

I have a question about the specification of N2 ( it's purity) that is used as Purge Gas.

I am appreciated if you answer my inquiry.

Regards
Yaser

[Padmakar Katre]

Dear the quality of Nitrogen or its specifications will depend on the the purpose of the purging like removal of mositure (dry out the system), make the system HC free or O2 free. Based on these applications the Purging N2 specifications are decided. Main charecteristics which are seen are moisture content and the purity i.e. the impurity contents like O2,Ne,Ar etc. The N2 which is most commonly used in the chemical/petrochemical/refinery units is 99.5 to 99.95 % v/v pure with very less content of the moisture and O2.
The purity of the N2 is can be measured by an online analyser and the dew point estimation will tell you about its dryness. Even after purging the system the by N2 the exit gas dew point is measured in order to check the dryness of the system which is purged.

Dear Mr. Katre;

Many thanks for you’re taking the time out for my inquiry.

Could you please tell us the specification of N2 when are purging in tanks for following conditions:
1- O2 free
2- HC free
3- O2 and HC free

Finally, we want to know any standard that applicable for determine the purity of N2 in the chemical/petrochemical/refinery units.

Regards,