×
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

B31.3 vs. B31.1

B31.3 vs. B31.1

B31.3 vs. B31.1

(OP)
The majority of our piping is per B31.3 but on one particular job it is specified as B31.1.  The customer specification also calls for 5% radiography on the butt welds per B31.1.  After reviewing B31.1 it does not appear to specify a % of welds to x-ray if you meet the criteria specified in Table 1 so I assume it is all of the welds meeting this criteria.  The design conditions of this particular job would not require any x-ray in themselves other than the addittional 5% requirement of the customer specification.  The problem is what to do if an x-ray is deemed unacceptable.  B31.3 requires 2 additional x-rays for the rejected one where as B31.1 does not appear to require this (I assume this because the code itself would already require all of the welds x-rayed if you where x-raying based on only the code).  I would assume that the rejected weld needs to be repaired and shot again but do not see any requirement for additional shots.  Not being familiar with B31.1 I was wondering if anyone had any experience with this type of an issue.

Thanks

RE: B31.3 vs. B31.1

B31.3 Para.341.4 shows examples of NDE using radiography.
Chapter VI in B31.3 will list all inspections but B31.3 will not tell you to what extent you must use as a % of NDE.
 ASME B31.3 is a standard to follow. Most companies require you to follow B31.3 as a minimum requirement.
 If you have shot a weld an it has tested bad the general rule is to repair the weld, then shoot the next three welds the welder makes.

RE: B31.3 vs. B31.1

B31.3 Para. 341.4.1 (1) does say at least 5% of fabrication must be tested with radiography. Some clients may require 10%. It all depends on what the service is. Catagory D may not require any testing other than visual & service test.

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