Contact US

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!

*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

Out of Roundness Definition ASTM A358

Out of Roundness Definition ASTM A358

Out of Roundness Definition ASTM A358


I’ve seen out-of-roundness defined various ways depending on the standard. Can anyone please help me interpret the out-of-roundness per ASTM A358 (Electric Fusion Welded Stainless Steel Pipe) stating:

“Out-of-Roundness – difference between major and minor outside diameters, 1%.”

Is this similar to ASME Sec VIII Div UG-80; where Out-of-Roundness is defined as: (Major Outside Diameter – Minor Outside Diameter) / Nominal Outside Diameter?

RE: Out of Roundness Definition ASTM A358

Well nearly, the math is almost identical.
In A358 you are dividing by the average, and in UG-80 you are dividing by the specified outside diameter.
I would hope that they would be the same in the end.

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

RE: Out of Roundness Definition ASTM A358

This helps, thank you for the clarification!

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


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