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Underwater laser scanning is ideal for measuring distances, elevations, and orientations of connecting surfaces of subsea assets. From the detailed point cloud models generated by laser scanning, the offsets of connecting surfaces can be measured in three-dimensional space. The highly accurate measurements obtained from these 3D models enable spools to be precisely fabricated and correctly aligned during installation.


Fugro Survey needed to design and fabricate tie-in-spools to connect flanges on a tree to flanges on a template. In order to design the tie-in-spools, measurements of the relative position and orientation of the flanges were required.


To obtain accurate and precise measurements, Fugro Survey used the ULS-200 underwater laser scanner. The ULS-200 was integrated with a Work Class ROV, which positioned the ULS-200 between flange sets. With the ULS-200 held stationary by the ROV, the scanner rotated about its rotary actuator in one continuous scan to produce a point cloud of both flanges on one coordinate system.


The 3D point clouds generated by the scans were then used to produce 3D CAD models of the flanges. Thanks to the high precision measurements provided by the ULS-200 scans, Fugro Survey was able to effectively design, construct, and seamlessly install the tie-in-spools.

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