×
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

Weld size in pressure vessel

Weld size in pressure vessel

Weld size in pressure vessel

(OP)
Hi, we're designing a pressure vessel and after performing the calculations there is one part that with 8 mm thickness is enough (corrosion allowance already included). Going to the next standard plate of 10 mm the weld thickness (two sides) is 0.7·10 = 7 mm which we can make in a single layer.
In this Project we have many parts in 15 mm thickness so we've decided to standarize thicknesses to 15 mm also for the part of 10 mm.
Now my doubt is, the welding of that part should be based of the nominal thickness of 15 mm(10.5 mm) or can I make it based on the mínimum required thickness?

All the standard seem to be based on nominal thickness but this would be overwelding a lot.

Best regards.

RE: Weld size in pressure vessel

What Code are you designing to?

RE: Weld size in pressure vessel

I think a little more explanation is required.....where are you getting .7 x 10 = 7mm?

RE: Weld size in pressure vessel

If the two intersecting plates are each 10 mm (3/8 nominal), a standard fillet leg is also 10mm

But the Euro convention is to size fillet welds by throat dim, which is approximately .7 x 10 mm. (0.707 in a CAD world.)

RE: Weld size in pressure vessel

(OP)
Hi, I'm designing to EN 13445-3 (european code equivalent to ASME VIII). All the fillet welds are according the throat size what is 0.7·min thickness. But in this case I'm using a minimum thickness oversized due to constructional issues. So, do I have to oversize the weld? Does it make any sense?

Thanks

RE: Weld size in pressure vessel

Don't know the first about EN 13445-3, but if the required weld size is referenced to the nominal or actual material thickness, then the weld must be sized accordingly if it is to meet that Code.

Simple, really.

Regards,

Mike

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

RE: Weld size in pressure vessel

You don't standardize all the welds to the same size.each weld is assess according to the size of each component welded. In most cases the Tmin rules which is the smaller of the thickness part to be welded to and then calculate accordingly. If some of the parts are of similar but differ a little then the use of a thicker weld can apply to all. In Your case you say it will become too thick to on the smaller parts. Well, you are creating your own problems in the design. it's the Code.whatever Code you're using. Regards

General Blr. CA,USA

RE: Weld size in pressure vessel

You have not described which part of the pressure vessels you are welding, however, I hope that you are not overlapping plates and fillet welding them to fabricate drums.

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