×
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 Relief of Flush-Type Clean Out Fitting

Stress Relief of Flush-Type Clean Out Fitting

Stress Relief of Flush-Type Clean Out Fitting

(OP)
Does a stainless steel flush-type clean out fitting requires thermal stress relief?

According to clause 5.7.4.1, all flush-type clean out fitting require thermal stress relief.

While Appendix D section 3.7 - 650-I-33/99 also states that stress relief is required regardless of the material used.

However under Appendix S, clause S.3.3.2 indicates that thermal stress relief requirements of 5.7.4 are not applicable for stainless steel.

Could anyone clarify on the above?

Many thanks.

RE: Stress Relief of Flush-Type Clean Out Fitting

Stainless steel flush-type clean out fittings do not require stress relief per S.3.3.2.

650-I-33/99 in Appendix D references Section 3.7.4 (in 1999).  This is equivalent to 5.7.4 in the 11th Edition 3rd Addendum.

RE: Stress Relief of Flush-Type Clean Out Fitting

(OP)
Thanks for the reply.

Yes, i understand that 650-I-33/99 section 3.7.4 is equivalent with 5.7.4.
That's why it contradict with S.3.3.2.

Am i correct that the statement "regardless of the material used" of Appendix D 650-I-33/99 only applied to all materials other than stainless steel?

RE: Stress Relief of Flush-Type Clean Out Fitting

Correct.  The specific requirements of Appendix S for stainless steel override the general requirements of Appendix D.

This difficulty came from 'expanding' 650 to encompass austenetic stainless steels, in adition to the ferritic carbon steels that it was originally written for.   

RE: Stress Relief of Flush-Type Clean Out Fitting

"Am i correct that the statement "regardless of the material used" of Appendix D 650-I-33/99 only applied to all materials other than stainless steel?"

Yes, that is my interpretation.

If you would like to submit a technical inquiry, you can email me a file and I will see that it is addressed at the committee meeting in April. (mfegenbush<at>caldwelltanks<dot>com).  

RE: Stress Relief of Flush-Type Clean Out Fitting

I agree with Mr. Fegenbush.  Appendix D is often a source of controversy due to its nature.

RE: Stress Relief of Flush-Type Clean Out Fitting

(OP)
Thanks all for the comment thumbsup2.
Appreciate very much.

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