I was wondering if anyone had experience performing external settlement surveys on in-service storage tanks. I see a lot of 3rd party inspection companies tend to incorporate settlement surveys in their external visual inspection reports.
I know API 653 has minimum required points in accordance with the tank's diameter.
Edge settlement surveys are performed during out of service/external inspections.
Essentially, what I am asking is, are settlement surveys performed from the outside, really effective? If they are, how effective are they on a double bottom tank?
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