Piping Designer – Nuclear Plant 3D CAD & Layout

General Matter, Inc.; Los Angeles (CA); On-site; USD 80,000 - 170,000; Full time

Job summary

General Matter, Inc. is seeking a Mechanical Designer to develop and maintain the 3D CAD model for piping and mechanical systems in a complex nuclear enrichment facility.

The role emphasizes detailed routing, spatial integration, and layout optimization to ensure accurate, constructible designs coordinated across disciplines. You will work with engineers to translate design intent into model-centric layouts, maintain isometric drawings and installation documentation, and support field

Qualifications

• Associate’s degree or equivalent experience in Mechanical Design, Drafting, or related field.
• 3+ years of hands-on experience modeling piping systems in 3D plant design platforms.
• Proficiency with plant design software (e.g., AutoCAD Plant 3D, AVEVA E3D, SmartPlant 3D, CADWorx, or similar).
• Strong understanding of piping systems, mechanical components, and industrial layout principles.
• Ability to interpret P&IDs and specifications into accurate 3D models.
• Experience producing piping isometrics, general arrangement drawings, and fabrication documentation.

Responsibilities

• Own and maintain the 3D CAD model for piping and mechanical systems, ensuring alignment with process and mechanical specifications.
• Develop, update, and maintain piping component libraries, data attributes, tagging, and system standards to ensure consistency between P&IDs, 3D models, and documentation.
• Perform detailed routing of pipes, valves, specialty components, and supports, considering space constraints, accessibility, maintainability, and constructability.
• Coordinate with structural, HVAC, and electrical systems to avoid clashes and optimize layouts.
• Conduct clash detection and interdisciplinary model reviews using plant design tools.
• Produce isometric drawings, general arrangement drawings, spool sheets, and installation documentation for fabrication and construction.
• Define spool breaks and support modular construction where applicable.
• Collaborate with engineers to ensure design intent, constructability, and field installation requirements are incorporated.
• Maintain as-built documentation and update models throughout the project lifecycle.

Skills

Piping system design

3D modeling

Interpreting P&IDs

Cross-disciplinary collaboration

Education

Associate’s degree in Mechanical Design or related field

Tools

AutoCAD Plant 3D

AVEVA E3D

SmartPlant 3D

CADWorx

Job description

General Matter, Inc. is seeking a Mechanical Designer to develop and maintain the 3D CAD model for piping and mechanical systems in a complex nuclear enrichment facility.

The role emphasizes detailed routing, spatial integration, and layout optimization to ensure accurate, constructible designs coordinated across disciplines. You will work with engineers to translate design intent into model-centric layouts, maintain isometric drawings and installation documentation, and support field