×
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

Need examples of welded products that maintain airtight/hermetic seal for 15+ years

Need examples of welded products that maintain airtight/hermetic seal for 15+ years

Need examples of welded products that maintain airtight/hermetic seal for 15+ years

(OP)
Hi everyone,

I'm looking for some proof that thin stainless steel (8-15mils) can be welded to contain a vacuum seal for 15+ years with minimal pressure change. Some products I found are vacuum insulated panels, vacuum insulated pipes, vacuum insulated food containers, and hermetically sealed electronics packaging. Any tips would be greatly appreciated!

RE: Need examples of welded products that maintain airtight/hermetic seal for 15+ years

The "longest stored" (although in a clean area with nitrogen pressure applied to eliminate moisture and contaminants) very thin pressure vessels I'm aware are the 30 thousand thick NASA moon rocket RP, LOX and LH2 fuel tanks and stages and their engines. Built 65-66-67-68 time period, kept until launch in the mid-70's.

RE: Need examples of welded products that maintain airtight/hermetic seal for 15+ years

Now, if you have NASA's 1960's budgets ....

RE: Need examples of welded products that maintain airtight/hermetic seal for 15+ years

Stainless thermoses.

Billions of aerosol cans.

Keith Cress
kcress - http://www.flaminsystems.com

RE: Need examples of welded products that maintain airtight/hermetic seal for 15+ years

Not sure about the lifetimes, but there are millions of vacuum Dewars for military infrared detectors that probably are good for at least 10 years. They're typically soldered for the detector window, pumped down, and then the copper vacuum nipple is pinched off.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

RE: Need examples of welded products that maintain airtight/hermetic seal for 15+ years

(OP)
Thanks, folks! In case anyone is interested, I turned up a few others: welded metal bellows (leak rates < 1e-9), cryogenic dewars storage containers for liquid nitrogen, and lots of medical products in general.

RE: Need examples of welded products that maintain airtight/hermetic seal for 15+ years

That's right! Lots and lots of pressure gauges have those Bourdon tubes though a lot might be brass and soldered rather than steel and welded.

Keith Cress
kcress - http://www.flaminsystems.com

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


Resources

White Paper - Implementing a Multi-Domain System
IoT systems are multi-domain designs that often require AMS, Digital, RF, photonics and MEMS elements within the system. Tanner EDA provides an integrated, top-down design flow for IoT design that supports all these design domains. Learn more about key solutions that the Tanner design flow offers for successful IoT system design and verification. 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