×
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!

*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

Stress Ratio definition

Stress Ratio definition

Stress Ratio definition

(OP)
Question:

Which is the meaning of "nominal pressure stress (based on minimum pipe wall thickness ..." in ASME B31.3 Fig.323.2.2B (a)-(1)?

I have a ASTM A333 Gr.1 pipe at 15 barg (217,5 psig) and -46°C (-50.8°F). How can I calculate the stress ratio?

Thanks for your help
Replies continue below

Recommended for you

RE: Stress Ratio definition

nicorvp,

To calculate the stress ratio for Figure 323.2.2B, go back to the basic design formula for straight pipe (304.1.2) and solve for "S" using the minimum pipe thickness less any allowances (usually 0.875*thickness listed in your pipe schedule less any thread and/or corrosion allowance) as t. This "S" is your nominal pressure stress.

Divide this nominal pressure stress ("S") by the code S from Table A-1 for the stress ratio.

Don't forget to look at notes (a)(2) and (a)(3) as well.

Good Luck.

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



News


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