Which statement about NDT intervals is true?

• A. Every two years
• B. To be completed on a 5 year interval, the end user may require to have the device tested more frequently depending on usage
• C. Annually
• D. Every ten years

Answer: (B)

NDT intervals are not a one-size-fits-all timer. There’s usually a baseline schedule (often described as a five-year interval) but the end user may need to test more frequently based on how the equipment is used and the conditions it faces. Heavy usage, harsher environments, material type, prior inspection results, and the criticality of the component all influence crack growth and corrosion rates, so a longer interval could miss developing flaws. The idea is to start with a reasonable baseline and then tighten the interval if usage or service conditions demand it to maintain safety and reliability.

That’s why the statement about a five-year interval with the potential for more frequent testing based on usage captures the correct approach. Fixed intervals like every two years, annually, or every ten years don’t reflect how real-world wear and risk vary with service, and they could either waste resources or miss critical findings.