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 floating production vessel (FPV). The study was undertaken after a recent remotely operated vehicle (ROV) survey of the MCU identified …

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Assessment of pipeline on-bottom stability to DNV-RP-E305 and DNV-RP-F109

The scope A major operator asked us to undertake a stability analysis of a 20″ trunkline to ensure the pipeline was stable. The as-built concrete coating thickness stated in the final survey report differed from the thickness given in the coating specification, therefore a re-assessment of stability was required. The solution The on-bottom stability analysis …

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Assessment of pipeline free spans to DNV-RP-F105

The scope An international operator asked us to perform a detailed span assessment for a major pipeline system. The scope included updating existing span anomaly criteria to the latest DNV code, using the most recent environmental data available, and recommending the maximum allowable span lengths. The solution Our team conducted analyses to determine the: Maximum …

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Assessment of fatigue of a subsea pipeline including analysis of dents

The scope A major operator was planning to re-develop two of their existing fields in the United Kingdom continental shelf (UKCS). It was anticipated that the re-development would result in greater production yields and increase the life of the field. Two import/export trunklines transported produced gas and, as a result of the re-development, the throughput …

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Riser analysis

The problem During a routine inspection of one of their risers, our client noticed that some of their riser guides were oversized, resulting in clearance between the riser and the inside of the guide. The riser had an outer diameter of 10.75 inches. The internal diameter of the guide was 14 inches. The clearance between …

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