×
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

Internal Grinding of avoid PWHT

Internal Grinding of avoid PWHT

Internal Grinding of avoid PWHT

(OP)
I have came across situation where there is Client approved WPS to weld 60" X 19.05 mm thick CS Pipe & Fitting for sea water service wihtout PWHT.
But the Material received has thickness more then 20 mm some of them are upto 24 mm, as per ASME 31.3 Fig 328.4.3 (b) internal trimming is allowed to avoid misalignment.
My Question :- Is it allowed to internally grind the excess metal to the required thickness ie 19.05mm in order to avoid PWHT.

Appreciate your comments and sugesstions.
Thanks,
MechInspec

RE: Internal Grinding of avoid PWHT

Quote:

Is it allowed to internally grind the excess metal to the required thickness ie 19.05mm in order to avoid PWHT.
.
The question as phrased, No.

 

RE: Internal Grinding of avoid PWHT

mechinspec,
Not sure which year B31.3 you are using but 2008 only requires PWHT for greater than 20 mm nominal wall thickness.
Key word here is nominal - definitions in 31.3 lists nominal as a designation - not an exact measurement.
So if you are supplied with 3/4" (19.05 mm) nominal wall thickness pipe and it happens to be actually 24 mm thick then IMHO it does not require PWHT (so grinding to correct misalignment is fine).
Bound to be an interpretation on this somewhere but cannot chase it up (sitting in an internet cafe in Northern Thailand)
Regards,
Kiwi

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