NDE for pipeline welded branch

[racp12]

For the construction of a 26" OD, wall thickness .375" NGL pipeline, API 5L Gr.X52, DP=900 psig, I have specified 100% radiographic inspection for butt welds in accordance with owner's practices.
My concern is regarding branch welds. For this case, is ultrasonic examination more adequate than RT?

 

[0707]

i would say yes

luis

 

[metengr]

What construction code are you working to B31.8, Section VIII, Div 1 ? Ultrasonic examination can be substituted for RT in most codes and standards of construction. However, you will need to develop a procedure for this and you may need to establish acceptance criteria.

 

[racp12]

Thank you, metengr. since the fluid is liquid hydrocarbon, code is ASME B31.4.

 

[BigInch]

You can generally use UT for both girth and branch welds. Refer to your contract specifications and see if they don't reference the testing and evaluation standards of API 1104 – "Welding of Pipelines and Related Facilities".

For ultrasonics see ASME S164 (I think that's the number)

http://virtualpipeline.spaces.msn.com

 

[SJones]

The question should be answered by an NDT Level 3 with UT and RT main methods after a review of the branch fabrication details and the welding procedure specifications.

Steve Jones
Materials & Corrosion Engineer

http://www.pdo.co.om/pdo/