DVT is too often confused with full design verification

The article shows that design validation testing (DVT) is structurally misunderstood in practice, posing risks to the reliability and safety of industrial valves. Colin Zegers explains that according to Shell MESC SPE 77/300 Appendix C, the DVT only covers the performance-testing part—such as seat sealing, fugitive emissions and operating torque under design conditions—and does not pronounce on design development, supply chain or production validation. Nevertheless, many end users treat a passed DVT as full approval, while essential steps such as foundry audits, process inspections and verification of design changes are ignored. This creates a false sense of security that can lead to the installation of valves whose actual robustness has never been fully proven. The performance tests in Appendix C are conducted through controlled pressure tests under specified design conditions.

Zegers positions a clear demarcation and correct interpretation of MESC SPE 77/300 as crucial for responsible decision-making. Appendix C is an essential instrument for testing performance within design limits, but it loses value when decoupled from the broader validation framework that also includes ISO-related audits and mechanical specifications. As an independent valve-testing specialist, Zegers emphasizes that end users must take responsibility for clear test requests and realistic expectations of certificates. Anyone who wants to understand where DVT ends and true design verification begins will find in the full article insights that directly impact procurement, risk management and operational safety.