How do you handle RT for tanks in your work

[monirri]

Hi. I am a Colombian engineer. I want to know some things about the mentality overseas.
I work in an enterprise reviewing work from a contractor. The contractor performs all types of NDE for tanks. One thing they do is Radiographic testing. My bosses keep telling me to choose for NDE the welded joints I think are going to be at fault, as for example, the first weld of a welder in monday (when he has no steady hand). My question is: Overseas, do you work like this? like policework trying to f*** the contractor? I mean, in the standards there is only a percentage, not such evil recommendations, that are common here. Thanks

Carlos Molina from

http://www.apiexam.com

 

[qcrobert]

Some codes or standards call out for a representation of different joint configurations.

If left up to me as a TPI I choose a horizontal seam (midway), vertical seam (midway), T-joint intersection between circumferential & vertical seams, circumferential seams of F&D heads, etc.

The goal is to assure quality not to f*** the contractor.

 

[JStephen]

The standards specify to some extent where the shots are to be located. For example, some in the first 10' by each welder, then one in each additional 100' or 200' or whatever, shots at 3-way junctions, etc. Generally, on the ones that are not at a specific junction, they are referred to as "random" shots, which, if you try to eyeball the worst welding and then shoot it, is no longer random.

There's no reason you can't do additional shots, or select locations on a different basis than what the standards say- but if you do, you're also inspecting to a higher degree than what the standards call for, and that should be addressed in your contract documents and may have some additional costs associated with it as well.