Identify dierences in the MCU’s minimum bend radius (MBR) and elevations above seabed between the as-laid and current Case Study: Optimising the efficiency of subsea installation maintenance The scope We secured a contract in 2015 with a major international operator to perform a study on a subsea main control umbilical (MCU), servicing two subsea control modules via a junction box under a oating production vessel (FPV). The study was undertaken after a recent remotely operated vehicle (ROV) survey of the MCU identied anomalies with the buoyancy modules. A review of the footage revealed the umbilical of the rst module was missing. The second had split in half but was still tethered to the MCU, sliding up the line and stopping at the base of the third module causing both to slide

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