ETEC International

Henry Gomez is Head of Engineering at ETEC International. He specializes in pump design and systems engineering, helping teams solve complex engineering challenges through practical, requirements-driven decision-making.

Engineering-Driven Material Selection

When material selection is treated as an engineering decision rather than a procurement choice, it becomes a systemslevel decision rather than a local optimization problem. Engineering evaluates whether a material satisfies the system requirements and, when the original specification is unavailable or unsuitable, alternative options must be assessed collaboratively with Procurement. Making the final decision within Engineering ensures that changes in material specifications are evaluated not only for their mechanical or chemical properties, but also for their effects on manufacturability, reliability, and interactions with other components throughout the system.

Why System Requirements Should Drive Material Selection

The relative weight of each requirement depends on the specific system. However, system-level requirements— such as functionality, reliability, manufacturability, lifecycle performance, and integration—should be validated before comparing material properties because they define the true engineering objective. Cost is frequently a limiting factor; therefore, a thorough engineering analysis is required to determine whether a particular material remains suitable for the intended application.

Managing Engineering Trade-Offs Through Systems Thinking

Engineering compromises frequently emerge at the interfaces between requirements, components, and subsystems. Individual components are often optimized successfully through standards, calculation methods, and safety factors, while interactions among system requirements receive comparatively less attention.

Some common examples include:

• Improving corrosion resistance at the expense of manufacturability.

• Reducing cost while compromising maintainability.

• Increasing mechanical performance while creating assembly difficulties.

• Introducing novel materials without fully understanding their performance, manufacturability and operative requirements.

A systems approach reduces these trade-offs by introducing an additional layer of engineering validation focused on requirement interactions. Hidden requirements, emergent requirements, and inconsistencies with the global objective of the system can often be identified earlier when design reviews explicitly address interfaces rather than individual components alone.

The objective is not to eliminate engineering compromises— which are unavoidable in complex systems—but to make them explicit, deliberate, and coherent with the overall objectives of the project. This view aligns closely with my experience managing engineering projects and material selection decisions.

Balancing Manufacturability, Reliability, Cost and Compliance

Manufacturability, reliability, lifecycle performance, cost, and compliance all influence material selection decisions, each carrying a different weight depending on the specific project requirements. Frequently, one or more of these factors become critical or particularly difficult to satisfy, shifting the focus of the engineering decision toward them. However, in industrial equipment projects, these requirements rarely operate independently. Their interactions often determine the final decision. Consequently, the preferred material is not necessarily the one that maximizes an individual property, but the one that best satisfies the coherent set of system requirements.

The Future of Systems-Based Material Selection

Given the increasing complexity of engineering systems, it suggests that material selection will become progressively more integrated with systems engineering practices. Future manufacturing environments will require engineering teams to manage larger amounts of information, more demanding regulatory environments, and novel materials.

From this perspective, systems-based material selection provides more than an additional verification activity. It offers a conceptual framework for understanding material decisions as the consequence of managing engineering requirements across multiple engineering disciplines.