Monitoring system guides Quad 204 manifolds to seafloor
Ashtead Technology has completed a subsea integrity management project connected to BP’s Quad 204 redevelopment of the Schiehallion and Loyal fields, west of Shetland.
The contractor deployed its new Deflection Monitoring System (DMS) to capture data required to safely install twosubsea manifolds at water depths of 400 m (1,312 ft).
The DMS monitors deflection, heading, pitch, roll, depth, and other parameters of subsea structures in real time, ensuring specified tolerances and safety requirements are taken into account.
For this project the system was optimized to the exact pressures and water depths at Ashtead’s calibration laboratory. It was then launched from a vessel and lowered to the seafloor.
The program, which allowed the subsea manifolds to be installed within 24 hours of the DMS being deployed, was controlled remotely via radio frequency and acoustic data links, removing the need for direct ROV or diver support intervention in order to gather attitude measurements.
Ashtead used a range of communication and positioning tools to enhance the accuracy of data collected.
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