Evaluate carbon dioxide versus nitrogen as a purge gas
Evaluate carbon dioxide versus nitrogen as a purge gas
(OP)
Hi folks
I need your advice in evaluating nitrogen against carbon dioxide as a purge gas.
It is small test rig with dimensions 2x6 meters.The purging method is based on drawing vacuum.
Also there is possibility of moisture in the system.Any tips how to eliminate this before or during the purging will be highli appreciated.I think the drawing vacuum will partly solve this problem but if there will be more water in the system...?
Thanks
Idontknowit
I need your advice in evaluating nitrogen against carbon dioxide as a purge gas.
It is small test rig with dimensions 2x6 meters.The purging method is based on drawing vacuum.
Also there is possibility of moisture in the system.Any tips how to eliminate this before or during the purging will be highli appreciated.I think the drawing vacuum will partly solve this problem but if there will be more water in the system...?
Thanks
Idontknowit





RE: Evaluate carbon dioxide versus nitrogen as a purge gas
All efforts are appreciated.
Do not hesistate to share knowledge :)
RE: Evaluate carbon dioxide versus nitrogen as a purge gas
RE: Evaluate carbon dioxide versus nitrogen as a purge gas
RE: Evaluate carbon dioxide versus nitrogen as a purge gas
There are a lot of reasons for doing a purge; you may be trying to get rid of an explosive or hazardous envirionment; you my be trying to get rid of air for process start up; or you may be trying to keep the environment safe for welding. Each of these purges has different design contraints. Nitrogen, CO2, and vacuum can all have a role in any of these purges, but the end result determines the quantity and quality of each in the purge-design.
Finally, you are on a mostly free forum. The best way to get quality engineering for free is to ask your question in a way that the engineers with the knowledge that you really should be paying for find to be interesting enough to respond to--if you ask a lame or boring question many of us will just close it and forget about you.
David
RE: Evaluate carbon dioxide versus nitrogen as a purge gas
Zdas04 I understand that it should be more information provided to get most of you,but some times I need a hint to give you more information.I will take your comments into account for my future postings and will give more details.
The reason for purging is :
*changing the gas compostion (from methane let say to ethane or butane.As i mentioned boefore it is test rig so different hydrocarnon gases are going to be used during the test.
* depressurusing and dismantling part of the equipment
The level of the vacuum is going to be down to 0,001 bar.
I attach the scheme of the rig to give more clear picture.
many thanks
Idontknowit
RE: Evaluate carbon dioxide versus nitrogen as a purge gas
The level of the vacuum is going to be down to 0,001 bar as I mentioned above the level of the dry is supposed to be quite high.
Idontknowit
RE: Evaluate carbon dioxide versus nitrogen as a purge gas
At your vacuum level you should know that you don't have liquid water in your chamber, only water vapour, which cannot react with CO2 to form the carbonic acid. I cannot see where the corrosion issues will become an issue, for as long as you keep the components in gas status. Obviously, things will turn quickly after you condense moisture and keep feeding the CO2. Other than that, I would say that you'll be fine for the operating conditions, purging the system with CO2. I just noticed that you didn't mention any temperature;- my comments do not apply for the low temperature applications...
cheers,
gr2vessels