“Localized thinning or under-deposit corrosion in sour water services is best detected by profile radiography, which provides a visual comparison of wall thickness over a length of pipe.”
“This technique is especially useful for assessing localized metal loss due to under-deposit attack or flow regime effects.”
(Reference: API RP 571, Section 4.3.2.3 – Sour Water Corrosion)
Hence, profile radiographic testing is most effective, making option B correct.
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