Tuesday, May 4, 2010

RE: [MW:5049] Radiographic or ultrasonic testing for Branch weld

The following is my view on B31.3
The table 341.3.2 in B31.3 suggests acceptance criteria for internal porosity, which can be checked by RT, and it is not necessary to carryout RT for all branch welds by this code, unless it is a contractual requirements.

Only fabricated branch connection welds comparable to those shown in Fig. 328.5.4E (pipe to pipe branching will not fall under this category) shall be examined by 100% radiography in case of sever cyclic conditions. else you may carry out MT/PT

It is not impractical, we can perform RT on Branch welds, but the difficulty to interpret these radiographs due to its geometry. 
Generally few client specifications call for RT on branch connections to an extent of 5 or 10% to check the fit up,  geometry and penetration etc, and not to detect the discontinuities 


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Pisat, R. (Rahul)
Sent: maandag 3 mei 2010 16:35
To: materials-welding@googlegroups.com
Subject: [MW:5027] Radiographic or ultrasonic testing for Branch weld

Dear All,
 
I have a query regarding application of NDE testing for pipe to pipe, Branch weld connection.
 
As per ASME B31.3 ( for Normal fluid and category M service : to check Internal porosity  ) and  EN 13480 ( category III service  : for DN>100 or Thick >15mm : 10% welds ),
 Branch ( pipe to pipe ) welds needs to be Radiographically/ Ultrasonically ( optional for Thickness > 15 mm as per EN 13480 ) tested.
 
But it is impractical to perform Radiography on Pipe to Pipe weld.
What is the common practise to test these welds and to comply with code requirements ( 31.3 & EN 13480 ) ?
 
Thanking you in advance
 

Kind regards

Rahul


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