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The project was designed to prepare for life extension of a subsea pipeline by replacing existing manually operated ball valves in the Main Wye of a major subsea infrastructure with new ROV operated ball valves.  Part of the task was also to ensure that the new cover has sufficient access to allow for the valves to be operated by ROV

To facilitate this numerous magnetic pig signallers were installed subsea prior to pigging operations from the various platforms each with different line sizes and flow rates.

To add to complexity the four platforms are operated by different companies, meaning coordination of each platform was required and isolation at each stage of the task.

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