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Components

The project sidebar for this example is shown in the figure below. The project sidebar shows all of the components that are used in the example. Each of these components is described in detail in the following sections.

Project Component

When a new PipeLay project is created it contains just a Project component. This component is used to store general project information such as the project title, location, and so on. The Project component is also used to specify certain project-specific settings such as the system of units to be used, global constants, finite element mesh settings and quality control procedures. For this example, the following information is stored in the general Project Settings dialog.

Table: General Project Settings

For this example, the default Metric unit system and the default Constants dialog values are used. Also, the ‘Quality Control’ section is left as per default.

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Material Component

The Material component is used to define the physical properties associated with a particular material. This example contains one Material component, which defines the non-linear material properties for X65 steel, as listed in the table below. The Material component is created in the Material folder and is named ‘X65 Steel’ in this example.

Table: Material Properties for ‘X65 Steel’

 

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Pipe Section Component

The Pipe Section component is used to specify the properties of an individual section of pipeline that has uniform properties. This example contains one Pipe Section component as follows:

▪The Pipe Section component is created in the Line folder and is named ‘24’’ Pipe’.

▪The specification is Standard.

▪The material used is ‘X65 Steel’, as defined previously.

▪The geometrical and hydrodynamic properties are listed in the table below.

Table: Properties for ‘24’’ Pipe’

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Line Component

The Line component is created in the Line folder and is named ‘Pipeline’. This Line component contains 4500 m of the Pipe Section component ‘24’’ Pipe(1)’.

 

Support Components

This example contains two Support components to model the supports on both the vessel and the stinger. Both Support components are created in the Stinger folder. One component is a Double V Support, named ‘V-Rollerbox’, and the other component is a Zero Gap O Support, named ‘Zero Gap Guide’. The ‘Zero Gap Guide’ component has a support length of 5 m. The properties of the ‘V-Rollerbox’ component are listed in the table below.

Table: Properties of ‘V-Rollerbox’

 

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Tensioner Component

A single Tensioner component is created in the Stinger folder and is named ‘Tensioner’. The Type is specified as Linear, while the Coefficient Type is specified as Active with default Damper properties. ‘Zero-Gap Guide’ is used as the Tensioner Support Stinger Component.

 

Stinger Component

A Stinger component is used to model the Rigid S-Lay stinger. This component is created in the Stinger folder and is named ‘Stinger’. Explicitly Defined is selected as the stinger definition option. The Support Locations on the stinger are listed in the table below.

Table: Support Locations on ‘Stinger’

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Vessel Component

A Vessel component named ‘Lay Vessel’ is created in the Vessel folder. This component models the lay vessel. The Standard Vessel Profile option is selected from the Profile Options drop-down list. The overall dimensions of the vessel are listed in the table below.

Table: Properties of ‘Lay Vessel’

 

The Vessel Reference Point, Stinger Location and Support Locations are all also defined in the Vessel component, the properties of which are listed in the three tables below respectively.

Table: Reference Point of ‘Lay Vessel’

 

Table: ‘Stinger’ Location

 

Table: Support Locations on ‘Lay Vessel’

Radii of Curvature are also specified on the Vessel component. This involves specifying two Y-coordinates for tangent points and their corresponding radii of curvature, as listed in the table below, which the ‘Lay Vessel’ and ‘Stinger’ supports are aligned upon. Specifying radii of curvature should ideally be carried out over a number of design iteration steps in order to achieve the optimum configuration (see Example 15 – Shallow Water Rigid S-Lay for an example of this design process).

Table: Radii of Curvature on ‘Lay Vessel’

To complete the definition of the Vessel component, the Vessel Motion component ‘Lay Vessel RAOs’ is associated with the vessel by selecting it from the Vessel Motions drop-down list.

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Vessel Motion Component

The Vessel Motion component is used to specify the dynamic motions of a vessel, including first order (RAO) motions and second order (drift) motions. This example contains a Vessel Motion component named ‘Lay Vessel RAOs’, which is created in the Vessel folder. The vessel motion option RAO + Drift is selected from the Motion Type drop-down list. The RAO file included in the example directory, Lay Vessel.rao, is loaded into the component through the RAO File dialog. These RAOs are supplied in the MCS Kenny format, so the remaining options are left unchanged.

To view the RAO data, you can generate a PipeLay RAO Report by selecting Yes on the Plot RAOs drop-down list. This RAO Report contains graphs of the RAO and phase angles for each of the translational and rotational DOFs for the vessel. The Heave RAO plot is included in the figure below as an example.

Seabed Component

A single Seabed component is created in the Model folder and is named ‘Rigid Seabed’. The default properties of a rigid seabed, with a zero coefficient of friction in the longitudinal and transverse directions and a slope of zero degrees, are left unchanged.

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Wave Component

Two Wave components are created in the Load folder. A Wave component, named ‘Regular Wave’, is added to model the regular wave included in this example. The Regular option is selected from the Type drop-down list and the properties of the component are listed in the table below.

Table: Properties of ‘Regular Wave’

A second Wave component, named ‘Random Sea’, is added to model the random sea included in the example. The Jonswap – Hs/Tz – Equal Area Discretisation option is selected from the Type drop-down list and the properties of the component are listed in the table below.

Table: Properties of ‘Random Sea’

 

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