Creating physical weld samples, known as mock-ups, which contain "seeded" flaws of known sizes and locations.
To achieve a PoD of 90% with 95% confidence, a minimum of 29 samples is generally required. However, for complex welds like double V submerged arc welds, DNV-RP-F118 recommends significantly more, often at least 91 samples . Key Components of the Qualification Process dnv-rp-f118
Because physical qualification is time-consuming and expensive, industry professionals often use simulation tools like CIVA NDT Software to augment the process. Simulation can: Predict probe coverage and beam behavior. Help design calibration blocks. Creating physical weld samples, known as mock-ups, which
Comparing the AUT results against the actual "true" size of the seeded flaws (often verified later by macro-sectioning the weld). Key Components of the Qualification Process Because physical
DNV-RP-F118 emphasizes that a small number of samples (like 3 or 4) is insufficient to prove reliability.
In the offshore oil and gas industry, the integrity of pipeline girth welds is paramount. As subsea operations move into deeper waters and more extreme environments, the standards for inspecting these welds have become increasingly rigorous. is a critical "Recommended Practice" (RP) published by DNV (Det Norske Veritas) that provides specific guidelines for the qualification of automated ultrasonic testing (AUT) systems and procedures. What is DNV-RP-F118?