×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Jobs

Vacuum chamber vent nitrogen circuit

Vacuum chamber vent nitrogen circuit

Vacuum chamber vent nitrogen circuit

(OP)
Hello, hope you can give me some orientation about this problem.

I have to do the basic engineering for a nitrogen venting system for a pretty big vacuum chamber (one of those made to test satellites and space devices).
The organization who wants it installed alredy has one functioning, but unfortunately it's pretty far away, so i can't just go and check the facilities myself, but i can ask for some info.

The chamber is about 50 m3, and the venting sholud be made in a short period of time (first unknown quantity, how much is fast and how much is too fast??) by inserting nitrogen, which is alredy available in a liquid nitrogen tank.

I think the way to go would be to take nitrogen gas from the top of the tank, then running it through a heat exchanger or a similar device, then through a regulating valve (i really dont know what kind and if there is anything rated for such big flow)then a spherical valve, a high vaccum blade valve and at last a diffuser to avoid damage to the tested elements

Does this circuit make sense? the regulating valve is intended to be the only one to affect the flow, but i have very little idea what kind of valve i should go for, or if there is a vavle that can give this amount of flow (expecting about 5 Nm3/min), preferably one without closed loop control.

Well, that's quite it, i hope one of you can give me some ideas

Thanks

RE: Vacuum chamber vent nitrogen circuit

You don't want to draw vapor from the top of the LN2 tank. The head space is variable and you will quickly lose pressure in this tank. You draw liquid though a vaporizer. In your case, since you know pretty precisely how much N2 you need to vent the vacuum chamber, you could size a compressed N2 vessel to be a just the right size and pressure so that it can supply all the N2 vapor needed for the venting event. This way the temperature would always be pretty close to room temp. Trying to control the temperature of a large surge flow of vaporized LN2 is not easy.

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!


Resources