Ultrasonic Thickness Testing for Corrosion

Ultrasonic thickness testing today is recognized by ASNT SNT-TC-1A and CP-189 as a limited certification; meaning it requires less hours of experience and training. No doubt the petrochemical industry was a strong supporter of this because it takes less time and money to get a UT II thickness limited technician out there scanning pipes, vessels and tanks for corrosion. It all works well as long as the corrosion exhibits large pits with broad reflective surfaces. Once this changes there are many setbacks that can drastically affect the results and create interpretation problems for the technician. This paper explores those setbacks and attempts to educate end users on how various factors affect their data.

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