×
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

Tube-to-tubesheet welds - ASME IX - PQR

Tube-to-tubesheet welds - ASME IX - PQR

Tube-to-tubesheet welds - ASME IX - PQR

(OP)
Hi Everyone,

We are welding stainless steel tube-to-tubesheets joints for one of our customers. We currently have a WPS/PQR to perform GTAW on stainless steel, which works for our application. However, our welder is finding that it is easier to not use any filler metal in welding these joints, so we are needing to create a new WPS/PQR.

Are tube-to-tubesheet welds considered a pressure retaining weld? I am trying to get away from doing the ASME IX tube-to-tubesheet procedure (I'm referencing QW-202.6), as we do not have time to purchase 2" thick stainless plate (the tubesheets we are dealing with are greater than 2" thick). I would like to perform a mock fillet weld test and qualify our welder from there, so what is to say I can't do that instead of the tube-to-tubesheet procedure?

Any input? Thanks in advance!

RE: Tube-to-tubesheet welds - ASME IX - PQR

(OP)
Also, I would like to add - we only received the tubesheets with the tubes, not the shell encasing. Does anyone have experience with this? We are not repairing any welds, as there were none to begin with, so not sure about the testing requirements as far as pressure testing or NDT, and if this requires NB stamping/certification.

RE: Tube-to-tubesheet welds - ASME IX - PQR

Quote (ARHodge)

Are tube-to-tubesheet welds considered a pressure retaining weld?

To realy answer that it would be helpful if Code if costruction was known. For example under Sec VIII, Div 1 there are two approaches to tube-tubesheet welds, namely UW-20 and Nonmandatory Appendix A. Knowledge of design requirements of the joint may be needed as well.

Best consult with your customer...

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

RE: Tube-to-tubesheet welds - ASME IX - PQR

Tube to Tube sheet welds are "Pressure Retaining welds". Conventional Sec-IX qualified groove welding procedure for qualifying a T#TS weld, is not acceptable. For quite sometime Sec-IX had incorporated the PQR/Mock Up qualification requirements, ref-QW-193 guidance.

Are you're trying to switch from a technique with Filler to a Technique with No Filler?
Then I would say a Mock-Up is mandatory for qualifying everything, Procedure/Mock-Up, welders. I would think QW-193 is very clear about such qualifications.

Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
ca.linkedin.com/pub/pradip-goswami/5/985/299

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