×
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

O Seal fitting compaatibility?

O Seal fitting compaatibility?

O Seal fitting compaatibility?

(OP)
We are looking at using Brennan fittings for a mobile system.  Our manifolds are ported with ORB type cavities (SAE J1926).  

Where we use male orb fittings (Swagelok P/N ss-400-1-4st for example) the Brennan crossover reference suggests using an O-Seal fitting (N6400-04-04-O).  

Will O-seal be an acceptable substitution considering the chamfer that is cut for an ORB port?  I have no experience with O-seal.  

thanks!
 

RE: O Seal fitting compaatibility?

(OP)
I forgot to mention that our manifolds are hard anodized aluminum.
 

RE: O Seal fitting compaatibility?

I don't think they are interchangeable.  The O-seal requires a full flat face for the o-ring to seal.  The SAE straight thread o-ring boss does not have enough surface due to the chamfered recess.
If the O-seal o-ring is fully contained in the fitting and the groove ID covers the chamfer in the SAE port, then it could work.  The O-seal also depends on the quality of the spotface surface of the SAE port which is not normally made with a seal-quality finish.
I would not risk it without testing.

Ted

RE: O Seal fitting compaatibility?

what is an O-seal? like a DIN 3852 adaptor (with the oring grooved into the bottom of the adaptor shoulder)?

RE: O Seal fitting compaatibility?

I try to check SAE J1926 from net, and Ted is right about the shape of the surface, however it will depend on the mating surface of your assembly. I mean if mating surface is a flat surface, this may solve your question.

please note that when o-rings are used in such assemblies results usually problematic. not to let any problems I would recommend you to take into account:
- Environmental conditions (o-ring material may react with the env.)
- Make sure that o-ring chamfer is appropriate (specs are available for such issues) you may check NASA site and search for it.

RE: O Seal fitting compaatibility?

Here is the brennan suggested equivalent:
http://www.brennaninc.com/ProductDisplay.asp?item=N6400-04-04-O-SS

to the Swagelok the OP is using:
http://www.swagelok.com/search/product_detail.aspx?part=SS-400-1-4ST

The Brennan is not an equivalent.

The Brennan would only be equivalent to this Swagelok fitting:
http://www.swagelok.com/search/product_detail.aspx?part=SS-400-1-4-OR

Perhaps Brennan should have suggested this as their equivalent to the Swagelok, of course Swagelok would not agree:
http://www.brennaninc.com/series.asp?item=C6400-O

Ted

RE: O Seal fitting compaatibility?

(OP)
Ted,
After following up with the Brennan salesman, he stated that the catalog page showing the N6400 fittings is in error.  The fittings are indeed ORB type, and the image (and name)are in error.

I will let you know if this is indeed the case.  (I prefer swagelok, but Brennan was 1/2 the price, and the accountants insisted we try Brennan.  We will see if we pay for that savings down the road with service issues!!)
  

RE: O Seal fitting compaatibility?

Thanks for the feedback.

Good luck.  I have used some Brennan fittings because of price and they were operationally successful.  Other of their T and cross fittings were brazed assemblies and I was not comfortable using them in place of forged or barstock fittings in certain applications.

Ted

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 - A Guide to 3D Printing Materials
When it comes to using an FDM 3D printer effectively and efficiently, choosing the right material at the right time is essential. This 3D Printing Materials Guide will help give you and your team a basic understanding of some FDM 3D printing polymers and composites, their strengths and weaknesses, and when to use them. 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