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Flexjoint and riser adapter

The Flexjoint and Riser Adapter tab allows to create and specify all top connections properties. Each line must be connected to a spool block given specific properties.

Warning

By convention, end nodes of lines named End_2 only must be connected to top connections defined within this tab.

Riser adapter and position of flexjoints is defined through common data and connection specific data. Data common to all top connections of the BOP Stack must be input through the edit boxes placed on the left hand side of the tab.

Connections and associated spool block properties are listed in the grid in the bottom of the tab. New connections can be defined by clicking the Add Spool Block button in the bottom right corner. Spool blocks can be deleted if required by clicking the Delete Spool Block button once the mouse is over the line to be deleted. Once created, connection points are available for line connection within the Edit Line window.

The definition of the adaptater will require the definition of the Z coordinate of the rotation of the flexjoint (see next figure, pointed by the parameter C). From there, the flexjoint is defined by two lines which heights and diameters are given in the next panel. The first line is represented by the white part in the following picture, this line is fixed. The second lines is the red part and can rotate around the center of rotation.

Each connection requires the definition of parameters (G,H) (connection of the spool, always present), (A,I) for the position of the connection with respect to the spool connection (I) and angle (J) for the built-in angle. The best approach is probably to define an inverted spool block and clamp it to the spool connection. Rotating angle K would then be equivalent to rotating the spool.

The angle L is the position of the kick out connection; angle K is the orientation of the departure angle with respect to the local axis defined by L.

The flexjoint will be located from the bottom connection to the upper face of the top flange. The white part in the above drawing does not move whereas the red part will rotate by 10 degrees in all directions.

Note

Correct definition of the kick out is important since the riser and especially the top end fitting connected to the upper kick-out may interfere with the flexjoint (white part) following the angle orientation.

The Flexjoint and Riser adapter display as three cylinders. These cylinders are used for display only and are not used in the calculations. The parameters of the flexjoints and Riser adaptor are also used for post-processing.