Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Nitrogen Dew Point

Nitrogen Dew Point

Nitrogen Dew Point

Hi There

please I'd need your opinion about this issue I am facing.

I have an equipment that is fluxed, sealed and filled with Nitrogen @ 2.5 bar.
Basically it would be completely dry.

On the contrary, when after some days we open this equipment in the final destination, the equipment has liquid inside

I assume that, since the dew point of Nitrogen is -80°C, the formation of this water is not due to Nitrogen, since the equipment never encounters these temperatures.

I have made checked all the nitrogen line, including filters.
The sole hypothesis I can make is that this equipment is not sealed perfectly.

Please, which is your opinion about ?

Thanks in advance

RE: Nitrogen Dew Point

If the equipment has been cleaned with a liquid at some time during the build process, then the liquid may not have been totally removed. It could be stuck in faying surfaces, cavities, convolutes of flex tubing, etc.

RE: Nitrogen Dew Point

Is the equipment arriving with a positive nitrogen pressure remaining on it? The previous suggestion seems to be reasonable to me, how are you ensuring this equipment is initially dried out before you put the N2 pad on it and close it up for shipping?

RE: Nitrogen Dew Point

Unless you have an absurdly tight air seal, there WILL be exchange with the outside environment. You do not say how much liquid is there, nor have you stated whether it's even water. What are the conditions around the box? Is condensation on the box occurring during transport?

FAQ731-376: Eng-Tips.com Forum Policies

Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers

RE: Nitrogen Dew Point

when we absolutely, positively have to have something dry, we purge with heated nitrogen and sample with a dew point analyzer to make sure the water is down to an acceptable level.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - The Evolving Landscape of Commercial Battery-Powered Trucks
What’s driving the evolving landscape of truck electrification? What are the barriers, motivators and strategies for accelerating the electric transition? What insights and resources are available for today’s design engineers working to achieve industry disruption and evolution? For answers to these and other pertinent questions, read this white paper. Download Now
eBook - Rethink Your PLM
A lot has changed since the 90s. You don't surf the Web using dial-up anymore, so why are you still using a legacy PLM solution that's blocking your ability to innovate? To develop and launch products today, you need a flexible, cloud-based PLM, not a solution that's stuck in the past. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close