Designing for Inspectability

Every product follows a lifecycle—from concept and design through development, manufacturing, service, and ultimately retirement. Throughout that journey, engineers make thousands of decisions that shape safety, reliability, cost, and sustainability. And throughout most of that journey, nondestructive testing (NDT) has historically shown up late to the conversation.

That is not a criticism. It is simply where the profession has traditionally lived: verifying quality during manufacturing, assessing condition during service. These are indispensable functions that have protected infrastructure, improved reliability, and saved countless lives. But they also place NDT in a reactive position— one where we are often asked to solve problems that were created long before we arrived.

When inspection access is limited, when weld geometries are difficult to examine, or when components require expensive disassembly for routine evaluations, the root cause usually traces back to a design decision made without NDT input. By the time an inspector encounters the problem, the options for solving it cleanly are already constrained.

I think we can do better than that. And I believe the profession is ready to.

Consider how other engineering disciplines have expanded their influence by moving upstream. Materials engineers shape product design from the earliest stages, selecting materials based on strength, fatigue resistance, corrosion performance, and manufacturability. The same logic underlies Design for Manufacturing, Design for Assembly, and Design for Reliability—philosophies built on the recognition that decisions made early in product development determine downstream cost and performance far more than any intervention made later.

Inspectability deserves to be treated the same way.

Designing for inspectability means asking, from the very beginning of product development, how a component will be examined during manufacturing, monitored during operation, repaired if necessary, and evaluated at the end of its service life. Rather than adding inspection as an afterthought, NDT becomes part of the engineering conversation from day one.

What would that look like in practice? Imagine product development meetings where NDT specialists sit alongside design engineers, materials scientists, manufacturing engineers, and reliability experts. Instead of asking “How do we inspect this?” after the design is finalized, teams raise these questions while there is still room to act on the answers: Will critical areas remain accessible after assembly? Can sensors or monitoring technologies be incorporated from the outset? How will future inspections affect maintenance costs and downtime? Can end-of-life evaluation support reuse or material recovery?

These are not purely inspection questions. They are engineering questions— and answering them well affects safety, ownership cost, asset availability, and environmental sustainability in ways that reach far beyond the inspection function itself.

The timing for this shift is right. Emerging technologies are creating new pressure and new opportunities. Digital twins depend on reliable condition data. Structural health monitoring requires that sensors be designed in, not bolted on.

Model-based engineering and advanced simulation rely on accurate material and structural characterization throughout a product’s life. AI can only be as good as the data it receives. NDT will increasingly be called on to supply that data—not as a quality checkpoint, but as an integral part of how we understand and manage engineered systems over time.

For ASNT, this represents a genuine opportunity to expand the profession’s influence and value. Our standards, certifications, and educational programs have done extraordinary work defining how inspection is performed. The next frontier is shaping how products are designed, so that inspectability is built in from the start, not addressed after the fact.

Future guidance from ASNT can help engineers consider inspectability as a design requirement rather than an operational constraint. Education programs can develop the next generation of NDT professionals who are fluent not only in inspection technique, but in the engineering conversations that happen upstream. Standards can evolve to address not only how to inspect, but how to design systems that can be inspected effectively throughout their lives.

None of this diminishes the importance of what the profession already does. Manufacturing inspection and in-service evaluation remain foundational. But the profession’s long-term influence— its seat at the engineering table—will grow in proportion to how early and how broadly it contributes.

When inspectability becomes a design objective, NDT moves from the end of the process to the beginning of the conversation. I believe that is where our greatest value lies, and where the profession’s next great evolution begins.