×
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

Tube to tubesheet joint of feedwater heater

Tube to tubesheet joint of feedwater heater

Tube to tubesheet joint of feedwater heater

(OP)
Dear mechanical engeneers and welding experts,
I am looking for help for Feedwater high pressure heat exchanger. The most critical part of this unit is tube to tubesheet joint. Does someone has experince of this type welding. In the past it was manual TIG root + top rod layer. Now welding technology have been developed and a lot of tube to tube sheet joints are done by orbital welding. Does someone have experience of orbital welding for high pressure unit (more 20 MPa). How it was after operation conditions? Any failures?

Thank you in advance for your answers!

RE: Tube to tubesheet joint of feedwater heater

There has been decades of research done on HP feedwater heaters funded by the US Government. This has been done by the scientists and engineers of EPRI. The proper design of this complex type of high-temperature, high-pressure HX far outranks the complexity of a process chemical shell and tube heat exchanger.

The welded joint you are taking about is an important failure point that affects reliability of the entire power plant.

The selection of the best weld procedure and inspection methodology (as well as the best design details for the entire HP feedwter heater) is not something I would trust to anonymous voices of the internet ....

MJCronin
Sr. Process Engineer

RE: Tube to tubesheet joint of feedwater heater

Ditto.
Automatic orbital welding, or any welding for that matter, is not something you can just pick up and perform on pressure equipment.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

RE: Tube to tubesheet joint of feedwater heater

(OP)
Thank you for your answers. I am not looking any welding proceedures here. We already done a lot of test and welding proceedures corespond to all relevant standards. I ask just experience during explotation of both methods.
Could someone share link to research in that field?

RE: Tube to tubesheet joint of feedwater heater

Shops that do a lot of them now will use semi-automatic orbital welding, TIG with wire feed.
They clean the reamed holes and tube ends, install the tubes, lightly roll then just to contact, purge for weld, weld (single pass), NDT (often PT and air test), then hard roll (either just front and back of full length in steps), then final test.
There are shops still manual welding. Some one pass and some two.
There are some out there that explosively weld the tubes into the tubesheets.
If done correctly they can all work.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

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 - Strategies to Secure Connected Cars with Firewalls
White-hat hackers have demonstrated gaining remote access to dashboard functions and transmissions of connected vehicles. That makes a firewall a vital component of a multilayered approach to vehicle security as well as overall vehicle safety and reliability. Learn strategies to secure with firewalls. Download Now
White Paper - Model Based Engineering for Wire Harness Manufacturing
As complexity rises, current harness manufacturing methods are struggling to keep pace due to manual data exchanges and the inability to capture tribal knowledge. A model-based wire harness manufacturing engineering flow automates data exchange and captures tribal knowledge through design rules to help harness manufacturers improve harness quality and boost efficiency. Download Now
White Paper - What is Generative Design and Why Do You Need It?
Engineers are being asked to produce more sophisticated designs under a perfect storm of complexity, cost, and change management pressures. Generative design empowers automotive design teams to navigate this storm by employing automation, data re-use and synchronization, and framing design in the context of a full vehicle platform. Download Now
eBook - Simulation-Driven Design with SOLIDWORKS
Simulation-driven design can reduce the time and cost of product development. In this engineering.com eBook, we’ll explore how SOLIDWORKS users can access simulation-driven design through the SOLIDWORKS Simulation suite of analysis tools. 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