NDLI: Hybrid Spool to Meet Deepwater Hybrid Riser Bundle Tower Critical Design Drivers

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Zhao, Tao Lee, Dan Willis, Neil Qiu, Hui Puliafito, Marco
Copyright Year	2012
Abstract	“Vertical type” spool configuration is commonly adopted as riser base spool for deepwater field development. With increasing water depths and risers subject to harsher environments, the excessive lower riser assembly motions and slugging induced fatigue damage have emerged as the governing design criteria for deepwater riser base spool design. Conventional vertical spool has inherent shortcomings to handle such design conditions. A new “hybrid” concept is therefore proposed, which extends beyond the “traditional” spool concept by integrating both vertical and horizontal spools into a 3D configuration. It inherits the vertical spool’s strength on handling large spatial expansion and utilise the pipe-soil interaction to dampen the potential resonance caused by slug flow. Several prototypes have been examined and the hybrid spool expansion-mechanism is discussed together with an optimisation procedure proposed. An advanced FEA technique using both Abaqus/Flexcom has been employed as part of the hybrid spool development, which consists of rigorous 3D dynamic analysis, bespoke non-linear soil interaction model and utilising the global riser dynamic behaviour. An in-house spool automation tool is developed to optimise the iterative analyses required to obtain a satisfactory hybrid spool configuration. This paper described a successful case study in recent deepwater hybrid riser bundle (multibore hybrid riser) tower development project, where the need to accommodate large lower riser assembly motion and slugging fatigue damage are the two main design drivers. This presentation provides a creative insight into this innovative technology.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
Starting Page	343
Ending Page	351
Page Count	9
File Format	PDF
ISBN	9780791844908
DOI	10.1115/OMAE2012-83420
Volume Number	Volume 3: Pipeline and Riser Technology
Conference Proceedings	ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2012-07-01
Publisher Place	Rio de Janeiro, Brazil
Access Restriction	Subscribed
Subject Keyword	Water Dynamic analysis Hybrid risers Optimization Design Pipeline risers Slug flows Soil Resonance Manufacturing Finite element analysis Risers (casting) Engineering prototypes Pipes Fatigue damage
Content Type	Text
Resource Type	Article

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