Tie-in spool analysis
Need for this analysis
The subsea pipelines are used to transport hydrocarbons from one location to another. The challenging operation after the installation of a subsea pipeline is the final connection between the pipeline and the interconnecting facilities (e.g. Riser, Manifold) with tie-in spools. The function of the tie-in spools is to provide an interface that bridges the inaccuracies associated with offshore pipeline installation and to accommodate pipeline expansion during operation.
This case study presents FEA of tie-in spool connecting pipeline with a fixed riser.
Our analysis method
In this case study finite element analysis is used to design the riser and the 250m tie-in spool of diameter 323.9mm (WT =20.6mm) connecting to the subsea pipeline, using the SPDT software.
The riser spools module of the SPDT was used for the following finite element analysis in ANSYS:
Design loads for Tie-in Flange Design
Strength assessment of Riser-Spool-Pipeline assembly
Strength assessment of Reducer
Result
The riser/tie-in spool configuration was modelled including elbows/bend/transition pup piece using SPDT inbuilt riser/spool configurator and was solved in ANSYS to confirm design integrity and predict tie-in loads for the design flanges and riser clamps.
The sample extracted results from SPDT are presented in figures below.
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