×
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

High frequency welded finned tubes acc. to ASME I

High frequency welded finned tubes acc. to ASME I

High frequency welded finned tubes acc. to ASME I

(OP)
Dear all,

because we are an european manufacturer and normally we fabricate boilers acc. to PED, I need some assistance:

We plan to suborder high frequency welded finned tubes (for evaporator and economizer) for boilers acc. to ASME Section I, S-Stamp.

Now we are discussing about the order text.

Can we order the high frequency welded finned tubes with S-Part acc. to current ASME Code, Section I? Or isn't it possible to order with S-part but only with an inspection certificate?

With this S-Part can we be sure that the manufactuer of the finned tubes has to comply with all the requirements of the current Code?
Or do we have to consider some other special requirement acc. to Section I?

Thank you in advance

Best regards

RE: High frequency welded finned tubes acc. to ASME I

(OP)
Hi again,
unfortunately it seems, that nobody has an answer for me.
So I will ask in another way:

Do the high frequency welded finned tubes fall under ASME Section I, PG-11, Miscellaneous Pressure Parts?

So, for them inspection by an Authorized Inspector, and Partial Data Reports are not required?

Thank you in advance.

Best regards

RE: High frequency welded finned tubes acc. to ASME I

Quote:

Do the high frequency welded finned tubes fall under ASME Section I, PG-11, Miscellaneous Pressure Parts?

No, PG-11 does not apply. Welded fin tubes must be ordered as pressure parts with a partial data report. In other words, as long as there are no butt welds (pressure bundary welds) in the tubing, they can be ordered as pressure parts with no S-Stamp, hydrostatic test or AI involvement because they are not fabricated parts from welding. See PG-112.2.4.

RE: High frequency welded finned tubes acc. to ASME I

(OP)
Thank you for your answer.
But the high frequency welded finnes on the tubes are not pressure retaining welding seams, only attachment welds on the pressure-retaining tubes. Does this make any difference? And does it make some difference if filler metals are used or not?

RE: High frequency welded finned tubes acc. to ASME I

If the finned tubes are for a new boiler, the pressure part can be supplied with only a partial data report by an S-Stamp organization or the S-Stamp holder is willing to take responsibility and this is in their Quality Manual. If this is a replacement pressure part, either an inspection certificate or partial data report are only required.

The welded fins are no different than waterwall panels with welded membranes that are fabricated by an S-Stamp shop. As long as no butt welds are in the tubes the panels are considered to be pressure parts with no welding, therefore, no stamping is required nor a hydrostatic test.

RE: High frequency welded finned tubes acc. to ASME I

(OP)
Thank you again, know some things are more clear.
But one thing isn't clear yet:

"Quote: As long as no butt welds are in the tubes the panels are considered to be pressure parts with no welding, therefore, no stamping is required nor a hydrostatic test. "

Do the attachment welds on the tubes fall under butt welds? Because for me the attachment welds are filled welds and no butt welds - or has ASME another interpretation of butt welds?

RE: High frequency welded finned tubes acc. to ASME I

Quote:

Do the attachment welds on the tubes fall under butt welds?

No, the nonpressure part to pressure part welds are fillet welds regardless if filler metal is used. The previous example I provided is one I use when we purchase boiler waterwall tube panels from suppliers. The membrane that is fillet welded along the sides of each tube to make a gas tight panel is not considered a pressure part butt weld - it is a non-pressure part to pressure part fillet weld.

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