The Challenge
AsBuilt was contracted to provide 3D laser scanning and modeling services to support the planned replacement of a Unit 4 Fan at a power generation facility. The fan replacement required precise as-built documentation to ensure accurate removal, installation, and integration within an active plant environment.
The fan assembly was located within a complex mechanical area containing structural steel, ductwork, platforms, piping, and utilities. Incomplete legacy drawings and undocumented field changes increased the risk of:
- Clearance conflicts during removal and installation
- Misalignment of duct connections
- Structural interferences
- Installation delays and rework
Engineering teams required verified, current-condition data to reduce uncertainty and support detailed replacement planning.
The Solution
High-Resolution Laser Scanning
AsBuilt conducted a comprehensive terrestrial laser scan (LiDAR) of the Unit 4 Fan area, capturing:
- Structural framing and support steel
- Existing fan assembly and associated ductwork
- Adjacent mechanical equipment
- Utilities and access platforms
- Spatial constraints and elevation data
The scan data was registered and post-processed to produce a high-accuracy point cloud representing the exact site conditions at the time of capture.
3D As-Built Modeling
Following quality control verification, the processed scan data was used to develop a detailed 3D as-built model (DWG format) of the fan area and surrounding infrastructure.
The model provided:
- Precise dimensional verification
- Clearance analysis for removal and installation
- Tie-in validation for ductwork connections
- A reliable foundation for engineering and fabrication planning
This digital representation reduced risk and enabled data-driven decision-making prior to equipment replacement.
Deliverables
- Raw laser scan data
- Post-processed, registered point cloud
- Photorealistic 3D visualization
- 3D as-built model (DWG format)
Results & Impact
The project delivered accurate, engineering-grade as-built documentation to support the Unit 4 Fan replacement. By leveraging laser scanning and 3D modeling, AsBuilt minimized installation risk, reduced potential rework, and provided a dependable digital foundation for project execution.
