![]() ![]() This uses a full weld on a sample piece of material fully intended to be destroyed to test it. this would "Qualify the procedure" and would be indicative to the quality of welds performed under those same essential variables. ![]() If it passed its tests, tensile, face bend, root bend and nick break tests. ![]() not very intuitive is it?Īfter the approach of controlling the essential variables for developing a procedure was honed (API 1104 section 5 for procedures), one could then destructively test a completed weld that followed that procedure. Think about it, you are damaging the pipe destructively to non-destructively test it. This would allow for the X-ray beam to travel perpendicularly through the butt welded joint, but the window itself was detrimental to the integrity of the weld joint and ultimately the integrity of the pipe. and was most oftenly used to place the radiographic "Source" inside the pipe (for non destructive testing), thereby allowing the NDT technician to "suspend" the source in approximately the middle of the pipe. (in lieu of grinding out a defect to repair it).ģ. As a method of cutting out a defect and inserting a clean piece of metal. This was supposed to be done with a cutting tool but was more often than not just done with a cutting torch in the field (with undesirable results).Ģ. Test the "coupon" that is produced (destructive testing such as tensile testing). In short Pipeline Trepanning is the practice of cutting a window into the pipe to accomplish a number of things:ġ. The word was derived from Trepanation, a medical procedure to cut a hole in the brain to relieve pressure. ![]()
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