×
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

Stress Analysis
2

Stress Analysis

Stress Analysis

(OP)
Hello all,
First post here so I figured I'd start out with an easy one:

I was looking for some insight on a assessment I have been working on. In an effort to improve the efficiency of the plant, I have been tasked with investigating whether or not it is possible to increase the design temperature of a high pressure steam piping system running from existing HRSGs to existing steam turbines.

We were provided with the pertinent information such as current design pressure, temperature, original piping spec, pipe material grade and pipe wall thickness data to calculate hoop stress per ASME B31.1. Using the minimum pipe wall thickness that we received, I calculated that the current design conditions for the pipe (725 °F, 960 psig) result in a hoop/maximum allowable stress ratio of nearly 1.

My question is:
Would further investigation or a full stress analysis of the piping system to determine actual combined stresses prove to be worthwhile? Or is knowing that the current hoop stress on the pipe is equal to the maximum allowable stress value dictated in ASME B31.1 enough to determine that there is no opportunity for an increase in design temperature?

Any insight would be much appreciated. Thank you.

RE: Stress Analysis

GoHawkbeaks,

If I was in your situation, I would say we are done without looking into it much further. You could do a simplified stress model for a representative portion of the piping to prove it, but in my opinion, you know what the answer is likely to be already.

RE: Stress Analysis

Dear GoHawkbeaks,

In your stress analysis spec is a table that determined which lines(according to temperature vs pipe size) should analyze.
Also in most cases, hoop stress is for determining wall thickness. Many pipe path may not have problem with internal pressure but thermal and weight cause over-stressing in some points. Thus, study your stress analysis spec for lines that you have doubt.

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