×
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

Design Factor for ASME Section VIII Div. 2

Design Factor for ASME Section VIII Div. 2

Design Factor for ASME Section VIII Div. 2

(OP)
The design factor for ASME Section VIII Div. 2 is 3. But when we try to back calculate this factor of safety by dividing specified min. yield stress with the allowable stress for low to moderate temperature range, the actual ratio comes as 2.82, 3.08, 2.97 etc. not exactly 3. So it means that we rounded-off the figure to nearest number or is there any other reason for these random numbers for factor of safety.
I also read that this number was previously 4 and revised to 3 in near past.

Any thoughts?

Thanks,

Meck91

RE: Design Factor for ASME Section VIII Div. 2

What year are you dealing with? Since the 2007 Edition of VIII-2, the design margins have been the lesser of:
a) 2.4 on room temperature minimum specified tensile strength
b) 1.5 on minimum specified yield strength
c) 1.5 on yield strength at design temperature

If you are the creep regime, then additional factors apply.

Prior to the 2007 Edition, a) was 3.0 - ALL previous Editions of VIII-2 had the above-noted values.

For additional reference, please review ASME Section II, Part D, Appendix 10.

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