Pipeline solutions following platform decommissioning

This paper highlights some of the challenges associated with managing pipeline integrity and continuing operation after the decommissioning of an offshore platform and the effect on the pipeline integrity, design life and operability. It also discusses how we can learn from the early stages of decommissioning and ultimately reduce the impact on continued production. The …

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Inspection of non-piggable pipeline for lifetime extension

The scope Jee’s client was operating a multi-phase oil production pipeline system beyond its original design life and therefore required an in-line inspection (ILI) to be carried out to verify the condition and confirm suitability for continued and safe operation. The pipeline was designed without pigging facilities and had subsequently never been in-line inspected during …

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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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