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


EN 13480-3 Sect 11. Integral Attachments-CONFUSION

EN 13480-3 Sect 11. Integral Attachments-CONFUSION

EN 13480-3 Sect 11. Integral Attachments-CONFUSION


I was wondering if anyone has gone through the calculations given for the integral attachments, I am trying at the moment and I have some sort of difficulty in understanding some of the issues as I tried to note in the attached file.

1. Notation "eord" is given in some pages of the code and description confuses the user. Fig 4.3-1 gives the definition of the wall thicknesses in a graph and explonation. This seems very clear. However, Table 11.3.2-1 has different definition for that. It calls it "nominal attachment wall thickness".  I guess this should be called "nominal/order pipe wall thickness". The formula given by (11.3.3-7) is very common and "eord" is representing the nominal pipe wall thickness.

2.Formula (11.3.4-6) has one more wall thickness "eord,T". There is no definition for this anywhere in the code. Is it the hollow thickness attachment wall thickness?

3. There is a formula (11.3.4-9) for J for attachment. Other formulas (11.3.5-1), (11.3.5-2) and (11.3.5-4) are using Jbar. Are J and Jbar the same? If not how can we describe Jbar.

4. Formulas (11.3.7-7) is giben for hollow round cross section which includes rectangular attachment dimensions.  I guess the formulas (11.3.7-7) and (11.3.7-7) should change the titles. Any ideas?

5. Figure 11.3.3-1 is given for circular attachments with keys a,b, and c.  I could not find any use of this Figure in the code and causes confusion. Does anybody knows where to use this figure information in the code.

It became a bit long, but to be able to put the code formulation in the spreadsheet I gues we need to clarify all the questions above.

I was wondering if anyone has done integral attachment calculation for hollow and rectangular. I would like to receive a copy if available. But the clarification above still could be sufficient.

Kind regards,

Ibrahim Demir

RE: EN 13480-3 Sect 11. Integral Attachments-CONFUSION

I forgot to add one more item to my questions:

6.  Formula (11.3.5-2) for "SigmaNT =..." second addition is given as "CN*W/ZN". I guess this should be replaced by "CN*MN/ZT". Any idea??

Kind regards,

Ibrahim Demir

RE: EN 13480-3 Sect 11. Integral Attachments-CONFUSION

Hi Saplanti,

I also have had the same problem. Did you ever get to the bottom of these issues? If so can you help me out?

Kind Regards,



EngCo Solutions Ltd

RE: EN 13480-3 Sect 11. Integral Attachments-CONFUSION



Unfortunately, there is no answer on the issue yet. I guess we need to wait for the next amandements on the code if one of the code committee memmbers is aware of the problems.


Ibrahim Demir

RE: EN 13480-3 Sect 11. Integral Attachments-CONFUSION


I have just gone through the BS EN 13480 A4:2010. I see that the questions I raised above are still valid, and I do not see any change for the subject.

I hope someone close to the committee can warn them about the confusion. I wish I had dircet contact with one of the committee members to explain what the confusion is causing.


Ibrahim Demir

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!


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