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Design Basis

The documented engineering assumptions, criteria and requirements that define how a facility or system will be designed.

Definition

A Design Basis is the documented set of engineering assumptions, operating conditions, design criteria, applicable codes, standards and performance requirements that establish the foundation for engineering design. It provides the technical justification for design decisions and ensures consistency across engineering disciplines throughout a project.

Why It Matters

The Design Basis provides a common engineering reference that supports consistent design decisions, regulatory compliance and effective project execution.

In Practice

A Design Basis document typically includes process conditions, environmental conditions, design life, applicable standards, operating philosophy, performance criteria and key engineering assumptions used throughout the project.

Common Misuse

The Design Basis defines the engineering assumptions and requirements used to develop a design, whereas individual design documents apply those requirements to specific systems or equipment.

Term Details
Synonyms:
Design Basis; Basis of Design; Design Criteria
Classification:
Engineering Design
Document Type
Intermediate
Applications

Engineering Design; Project Delivery; Engineering Documentation.

Where It's Used

Process plant design.; FEED studies.; Detailed engineering.; Project execution.; Design reviews.

References

ISO 15926; ISO 19650

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