×
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

Welding of end flange
2

Welding of end flange

Welding of end flange

(OP)
Hi Guys,
Currently got half a dozen 16" Class 600 Swing check valves on the workshop floor.
End to end dimensions are under spec and wondered what the options are.

Is it possible to weld the flange and raised face to bring it back into spec?

Photo attached

Cheers

RE: Welding of end flange

You don't mention how much under specification the length is...so my response is considering something less than 0.125"/3mm of welding per flange.

If that were a new valve, I'd be inclined to tell you yes, and to treat it as a weld defect and repair. But the valve looks used, so I don't think I would try to do so and pass it off as a weld repair.

If you are a valve repair shop, and will be reselling the valve as re-manufactured, then I would think that you can do so, provided you provide full disclosure of such to any potential buyer. If you don't think any of your customers would buy those valves with the welding as described, then I think you have the answer.

Another option altogether would be to convert to an RTJ flange, where flange faces are commonly welded-up with Inconel 625 of 316SS for the groove face.

RE: Welding of end flange



As you suggest welding to get the correct length, I presume there is only a very shorth length missing. If it is acceptable to end user the best way would probably be to use 'loose flanges' ( Fabricated flanges in correct thickness for compensation ) or if not, short (long enough) connection/dismantling pieces, which would also helpmounting and demounting.

RE: Welding of end flange

(OP)
Thanks fella's, we have them in the workshop for repair, not re-sale to anyone else.

The worst valve is 2mm outside the 3mm tolerance on the end to end dimension.

I'm assuming the weld repair will be the expensive option in this case. Probably just a case of asking our client which option they are happiest with.

thanks

RE: Welding of end flange


In that case I would also have asked a reliable gasket supplier for comments/possibly compensation with gasket or special gasket.

RE: Welding of end flange

Thirlmere,

Do you procure valves from the manufacturer?
What's the recommendation from the valve manufacturer in case of out-of tolerance valves?

RE: Welding of end flange

(OP)
Thanks fella's, some good suggestions there.

Our company have the contract to repair the clients valves, but sadly we don't have the contract to replace any that are B.E.R.

Thats why we will always look for a solution before declaring the valve beyond repair.

Nothing to stop us contacting the manufacturer and asking their policy on out of tolerance valves, however, i expect they would simply try and sell us a new one.

The special gasket route seems like the most cost effective and certainly a lot cheaper than a replacement valve in this case.

I'm assuming all of the above suggestions (loose flanges etc) are all recognised ways of dealing with such situations?

Cheers

RE: Welding of end flange

Loose and special flanges, dismantling pieces and special gaskets are all commercial available and have been used in practise and can be built and tested to different standards. As you imply, it is however, always needed to check what end users and local authorities can and will accept for the exact location and application.

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