×
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

Creep Rupture Strength Data for A335 P22

Creep Rupture Strength Data for A335 P22

Creep Rupture Strength Data for A335 P22

(OP)
Where I can refer Creep Rupture Strength data or curves for A335 P22 Material?  

RE: Creep Rupture Strength Data for A335 P22

You can try EPRI. They have been releasing some of their past publications on the public domain.

http://my.epri.com/portal/server.pt?

RE: Creep Rupture Strength Data for A335 P22

(OP)
thanks metengr

The link took me to an articel meant for sale.

I will try EPRI also.

However let me be specific. we have a pipe of A335 P22 , (105 kg/cm/62 press & 500 deg^c temp.) but accidentaly was subjected to a temperature more than 600 deg. c for 4 hrs.

Visual inspection revealed a creep in the pipe. the diameter has increased by 20%. can we use this pipe back into service after hydro test?


 

RE: Creep Rupture Strength Data for A335 P22

ak1965;
Apparently your original post regarding the failure was inadvertently deleted. Anyway, here is what I would suggest if the OD has increased by more than 5% after careful cleaning and checked with calipers or a pipe tape; I would not recommend it be re-used.

In my past life when we monitored both hot reheat and main stem piping, we performed in-situ surface replication and dimensional checks for creep swell. Normally, 5-7% creep swell is a good indicator that you are reaching end of creep rupture life. Remember, this is seamless material just like boiler tubes, and when you measure OD changes of this magnitude, replacement should be scheduled. If necessary, you could possibly push this limit to 8% with comprehensive surface replicas, as I mentioned in your OP.
 

RE: Creep Rupture Strength Data for A335 P22

(OP)
metengr

I too was surprised to see that the original mail has
become extinct suddenly. i searched but failed.

Any ways I appreciate your experience and we are also thinking on the same lines and arranging for in-situ replica followed by metallogrpahical examination of ruptured piece.

I shall get back to you with more inputs in due course of time.



 

RE: Creep Rupture Strength Data for A335 P22

For the P22 fatigue data, see Brinkman et al:"Elevated temperature fatigue behavior of 2 1/4Cr 1 Mo steel", J Press vess tech, trans ASME Nov 1975 pp252-257. This formed the basis of the fatigue curves in the ASME code case N-47.
 

RE: Creep Rupture Strength Data for A335 P22

See API 530 for required curves

RE: Creep Rupture Strength Data for A335 P22

ASME Section III, Division 1, Subsection NH, Class 1 Components in Elevated Temperature Service, Table I-14.6D shows the expected minimum stress-to-rupture values for 2.25Cr-1Mo material. The values are given in customary units as well as SI units.

Hope this helps.

RE: Creep Rupture Strength Data for A335 P22

You say that "The diameter has increased by 20%"

This is evidence of extreme overheating damage.

I do not think you have many choices at this point in time.

Stand back...

   

RE: Creep Rupture Strength Data for A335 P22

(OP)
Mjcronin

We have replaced the whole P22 piping with new one and shall be hydortesting it soon.

Thanks for all guidance.  

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