I am having some problems with the interpretation of the API code about welding procedures. I am involve in a project manufacturing an API tank, we are having problems in some section were we have overlapping welding. In the same spot I got union of metal plates and the internal structure. Now I do not know how to attack this problem. I was thinking to perform non- destructive test, to make sure there is a well-welded union.
Have anyone have any suggestions that can lead me to the solution of this problem?

You might want to post ths question at "Engineering-Tips". They have an "API" forum there. The URL to this forum is: http://www.eng-tips.com/threadminder.cfm?pid=809 .