Inspection of port infrastructure
3D scan of a port infrastructure: discover how photogrammetry can be your solution
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Assessing a riser base’s structural integrity in record time
- Industry: Oil & Gas
- Location: United Kingdom – North Sea
- Hydro: Hydro 1000 | ROV: FCV3000 | Depth: 90m
Mission context
Our subsea photogrammetry solutions were deployed during an FPSO inspection, focusing on two critical assets: a riser base and a mooring chain trumpet. Comprehensive photogrammetric surveys were carried out on both structures to provide accurate dimensional data for engineering assessment.
A structural deflection had been identified on the riser base. The objective of the photogrammetric inspection was to generate an accurate 3D model of the structure and perform precise dimensional measurements to determine the bending angle.
On the mooring chain trumpet, significant erosion had been detected. The inspection focused on assessing contact wear and notching at the interface between the trumpet and the mooring chain links. The resulting 3D model enabled accurate measurement of the material loss, providing the data required to determine whether the component could remain in service or needed replacement.
Why use photogrammetry for riser base and mooring chain trumpet inspection?
- Measurable 3D data: more than visual inspection
- High accuracy: detects wear, deformation, and contact zones
- Handles complex geometries: ideal for trumpets and chain interfaces
- Better than sonar/LiDAR: higher resolution without ROV stability requirement
- Repeatable over time: enables monitoring and comparison
- Safer & faster: reduces dive time and offshore exposure
IVM Solution
The inspection was carried out using the Hydro 1000 subsea photogrammetry camera, integrated onto a work class ROV. To maximize flexibility during the survey, the system was mounted at the end of the ROV’s 7-function manipulator. This configuration allowed the operator to position the camera close to the assets and acquire images from multiple viewpoints, including confined and difficult-to-access areas, ensuring complete coverage of both the riser base and the mooring chain trumpet.
Data acquisition was completed efficiently, requiring 4 hours for the riser base survey and approximatively 1 hour for the mooring chain trumpet. Following acquisition, the photogrammetric datasets were processed to generate measurement-ready 3D models. Processing required 4 days for the riser base survey and approximatively half a day for the trumpet inspection.
3D model
Dimensional control
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