Inspection of port infrastructure
3D scan of a port infrastructure: discover how photogrammetry can be your solution
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Structural integrity of a 1970s platform jacket
- Client: Subsea 7
- Industry: Oil & Gas
- Location: United Kingdom – North Sea
- Hydro: Orus3D (former Hydro 3000) | ROV: Subsea 7’s ROV
Mission’s context
In the demanding environment of offshore oil and gas operations, the integrity and safety of platform infrastructure are of paramount importance. Commissioned to inspect a platform in the North Sea, Subsea 7 chose IVM Technologies to conduct a photogrammetric survey of a jacket.
The jacket understudied is a four-legged tower, standing in 162 meters of water. This jacket is a first-generation Northern North Sea, installed in 1976 with an initial design life of 25 years. Over the decades, the jacket has been subjected to various forms of damage, including fatigue loading, accidental impacts, and corrosion, all of which have compromised its structural integrity.
Given the platform’s extended operational life beyond its original design parameters, the client recognized the need for a comprehensive inspection and 3D reconstruction of the slots. This initiative was crucial for assessing the current condition of the platform, identifying potential areas of concern, and planning necessary maintenance and repair activities to ensure continued safe and efficient operations.
IVM Solution
To overcome the access restrictions, our teams implemented a two-step inspection strategy. This approach involved:
- Top section inspection: The ORUS3D photogrammetric system was positioned at the bottom of the ROV to capture detailed data of the top section of each slot. This configuration allowed for optimal imaging of the upper components and structures.
- Bottom section inspection: The ORUS3D system was then repositioned to the top of the ROV to inspect the bottom section of each slot. This adjustment facilitated comprehensive data capture of the lower components, including areas underneath the conductor guides that are typically difficult to access.
This dual-positioning technique ensured that all critical areas of the slots were thoroughly inspected, despite the access restrictions. The flexibility and adaptability of the ORUS3D system were instrumental in the successful execution of this strategy.
The data captured during the inspections was processed to generate high-resolution 3D reconstructions of the slots. These detailed 3D models provided a comprehensive visual representation of the inspected areas, enabling precise identification and localization of key components including: welds, pad eyes, anodes and clamps.
Complete 3D model of the jacket
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