×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

using weldolets

using weldolets

using weldolets

(OP)
Do the piping codes permit the use of 6-inch weldolets on a 14-inch line?  Application is water injection in the Algerian desert - no statutory codes but they recognise "major" international standards e.g ANSI, BSI, DIN etc.

Thanks

Geoff

RE: using weldolets

You can use a 6" Weldolet on a 14" header
Only make sure to specify pipe wallthickness (Schedule) for both branch and header. You need to consider both in order to find out whether to use STD, XS, XXS or heavy wall weldolet. The supplier will be the best one to tell you that - MSS SP-97 does not. What I mean is you should specify f. ex. 14" Sch STD x 6" Sch XS in stead of a 14x6" Sch XS weldolet.
The weldolet sizes are based on equal scheduled branch and header and if they are not equal you should let them advise you.

I have this from an old Bonney Forge catalog:

"Where the schedule of the run is greater or less than the schedule of the branch, it is essential that both schedules be specified........."


Make sure that the supplier has a design approval for the fitting (there are many small outfits out there making their own fittings without any documentation)
Try the site http://www.bonneyforge.com/
They have all the dimensions (they invented the weldolet and own the trademark) and you'll be sure the fittings have a design approval. Actually I think dimensions in MSS SP-97 are based on Bonney Forge.

Best regards

Mogens

mgp@kabelnettet.dk

RE: using weldolets

You can also try WFI for information on their version of a Weld-O-Let.  I've used their products at times instead of Bonney Forge with good results and they have provided good technical assistance.  In addition to specifying the schedule of both the run and branch you should take a look at the metalurgy of the pipes, the fitting, and see how it works with your welding code/procedure.

If possible I would avoid this fitting and go with a reducing tee.  Especially if you have any vibration or high stresses.

RE: using weldolets

Geoffrey,

The ASME pipe codes do not address this question directly.  The use of weldolets is approved if the area replacement rules of the relevant code are followed.

I know that 6" weldolet branches are allowed on 14" lines by most major oil companies in 900 and 1500# Class carbon steel systems. Depending on your situation you may need to provide calculations.

Regards,

Gunnar

RE: using weldolets

This is why you need to make sure that the supplier provides the design approval (thus you have to provide both schedules). You should not provide design calculations yourself, as it is normally difficult to obtain the exact geometry from the supplier.
When the weldolets are type- or design approved for the given schedules (and the relevant code) they may also be used for lower ratings than 900#.

Regards
Mogens

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

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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