Case Study: 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 the riser and the guide allowed for a degree of riser movement within the guides under environmental loads. We were asked to investigate the potential impact of the oversized guides on the tness for purpose of the riser. The solution We undertook an analysis of the riser using the OrcaFlex software. This was capable of performing a dynamic and non-linear analysis of the problem, allowing for a time based analysis which accurately modelle

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