Components

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Components

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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 Sidebar for Example 16

Project Sidebar for Example 16

 

 

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

Property

Value

Project Title

Example 16 - Reel Lay

Job Number

1-2-3-342

Engineer(s)

Wood Group

Location

Galway

For this example, the default Metric unit system option is used, along with the default Quality Control selections. Under the Constants dialog however, the Maximum Element Length is specified as 2m (instead of 10m default) with the remaining entries selected as per default. This change in element length is a reflection of the shallow water nature of the scenario under consideration.

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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, ‘Gr415 Steel’, with properties as listed in the table below. This is a nonlinear material specified by a moment-curvature curve.

 

 

             Table: Material Properties for ‘Gr415 Steel’

Property

Value

Young's Modulus

207 GPa

Poisson’s Ratio

0.33

Mass Density

7850 kg/m3

Yield Strength

415 MPa

Allowable Stress

100 %

Allowable Strain

0.29 %

Moment-Curvature Curve for ‘Gr415 Steel’

Moment-Curvature Curve for ‘Gr415 Steel’

 

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 ‘12" Pipe Section’.

The specification is Standard.

The material used is ‘Gr415 Steel’’, as defined previously.

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

Table: Properties for ‘Concrete Coated Pipe’

Property

Value

Outer Diameter

304.8 mm

Thickness

19.05 mm

Normal Drag

1

Normal Inertia

2

12’’ Pipe Section’ has one external coating applied, a corrosion protection coating with properties defined in the External Coatings dialog as listed  in the table below.

Table: Properties for External Coatings

Property

Value

Coating Name

Corrosion Protection

Thickness

3 mm

Mass Density

800 kg/m3

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Line Component

The Line component is created in the Line folder and is named ‘Pipeline’. This Line component contains 900 m of the Pipe Section component ‘12’’ Pipe Section’. An active line length is to be modelled so the specifications for the Active Properties dialog are listed in the table below and the timetrace file Pay Out Velocity.ttr is loaded into the component through the Timetrace File dialog.

Table: Properties for Active Properties

Property

Value

Distance along Line to Active Region

100 m

Initial Active Region Element Length

1 m

Min. Active Region Element Length

0.1 m

Max. Active Region Element Length

10 m

Length of Active Region

50 m

 

Support Components

This example contains four Support components, created in the Stinger folder. The support names, types and specifications are listed in the table below. The support types are selected from the Support Type drop-down list and the specifications are entered in the Support Properties dialog.

Table: Properties of Support Components

Support Name

Support Type

Support Length

Roller Length

Stiffness

Zero-Gap O-Support

Zero-Gap

2.5 m

-

-

0.40m O-Support

O-Shaped

2.5 m

0.4 m

5000kN/m/m

0.60m O-Support

O-Shaped

2.5 m

0.6 m

5000kN/m/m

1.00m O-Support

O-Shaped

2.5 m

1.0 m

5000kN/m/m

 

Stinger Component

A Stinger component is used to model the reel-lay ramp. This component is created in the Stinger folder and is named ‘Reel-Lay Ramp’. J-Lay is selected as the stinger Type and the Support Locations listed in the table below are specified. A Tower Angle of -70° is specified in the Tower Properties dialog. A Connection Point is specified at a distance of 28 m along the tower, with DOFs 1-3 and DOFs 4-5 set to 0 m and 0° respectively.

Table: Support Locations on ‘Reel-Lay Ramp’

Support Name

Support Distance (m)

Zero Gap O-Support

16

0.40m O-Support

4

0.60m O-Support

-8

1.00m O-Support

-20

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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’

Property

Value

Length

250 m

Depth of Keel below Origin

10 m

Horizontal Offset from Origin

125 m

Create Solid Profile

No

The Stinger Location is also defined in the Vessel component, the properties of which are listed in the table below.

Table: Location of ‘Reel-Lay Ramp’

Property

Value

X Coordinate

25 m

Y Coordinate

-5 m

Z Coordinate

0 m

Stinger Angle

0°

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

 

Vessel Motion Component

The Vessel Motion component is used to specify the dynamic motions of a vessel. This example contains a Vessel Motion component named ‘Lay Vessel Velocity’ which is created in the Vessel folder. The vessel motion option Timetrace is selected from the Motion Type drop-down list. The timetrace file included in the example directory, Lay Vessel Velocity.ttr, defines the combined (first and second order) vessel motions and is loaded into the component through the Timetrace File dialog.

 

Seabed Component

A single Seabed component is created in the Model folder and is named ‘Elastic Seabed’. A seabed stiffness of 50 kN/m/m is specified and the remaining default properties for an elastic seabed are left unchanged.

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