API Code restrictions on plugging/patching holes (NEW TANK)

[pipewelder1999]

Are there any restrictions for welding a flush patch in a NEW API 650 tank provided 100% RT is performed. (Additional Reinforcement, Lowest course, etc.)

Thanks


Gerald Austin
Iuka, Mississippi

http://www.weldinginspectionsvcs.com

 

[JoeTank]

Although using a flush patch is sometimes needed during new tank construction, it is not specifically addressed in API-650. So, you are at the point where you and you client must agree on what to do. Your comment about using a flush patch, full penetration and full RT sounds like a reasonable approach. Remember to use a proper WPS/PQR for the material. I'd recommend same as used for shell verts seams. MT or PT of final surfaces would be appropriate too. API-653 should not be used for new tank construction, but it does have a good guideline for minimum size flush patches, corner radii and weld spacing.

Joe Tank