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 11

Project Sidebar for Example 11

 

 

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 11 - Davit Lift

Job Number

1-2-3-342

Engineer(s)

Wood Group

Location

Galway

For this example, the default Metric unit system is used. The mesh density is refined by setting the Maximum Element Length to 2 m and everything else is 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 component, which defines the material properties for steel, as listed in the table below. The Material component is located in the Material folder and is named ‘Steel’ in this example.

Table: Material Properties for ‘Steel’

Property

Value

Young's Modulus

207 GPa

Shear Modulus

79.9 GPa

Poisson’s Ratio

0.33

Mass Density

7798.3 kg/m3

Coefficient of Expansion

0 1/c

Yield Strength

448 MPa

Allowable Stress

100 %

Allowable Strain

0.25 %

 

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 ‘35’’ Pipe’.

The specification is Standard.

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

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

Table: Properties for ‘24’’ Pipe’

Property

Value

Outer Diameter

889 mm

Thickness

35 mm

Normal Drag

1

Normal Inertia

2

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Cable Component

The Cable component is used to specify the properties of an individual section of cable that has uniform properties. It is similar to the Pipe Section component in many respects, though less complex, as no additional coatings or attachments may be specified. This example contains one Cable component as follows:

The Cable component is created in the Line folder and is named ‘Cable’.

The Standard specification is selected and the material used is ‘Steel’, as defined previously.

A relatively low bending stiffness of 1 kNm² is explicitly defined.

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

Table: Properties for ‘Cable’

Property

Value

Diameter

40 mm

Normal Drag

1

Normal Inertia

2

 

Connection Component

The Connection component is used to model arbitrary connections between two lines (e.g. pipe sections, cables, etc.). Three separate connection modelling options are available, namely, Free, Hinged and Clamped. In this example a Clamped connection, named ‘Cable Connection’, is used to join the winch cables to the main pipeline. The table below shows the physical properties of this connection.

Table: Properties for ‘Cable Connection’’

Property

Value

Weight in Air

0.1 kN

Weight in Water

0.05 kN

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Line Component

The Line component added to the Line folder, named ‘Pipeline’, contains 500m of the Pipe Section component ‘35’’ Pipe’. Connection points are defined at various lengths along the line in order to facilitate the connection of winch cables. The table below summarises the connection point definitions.

Table: Summary of Connection Points

Name

Component

Distance along Line

Winch1

Cable Connection

485.5 m

Winch2

Cable Connection

457.75 m

Winch3

Cable Connection

430 m

 

Vessel Component

A Vessel component is used to model the vessel, also named ‘Vessel’, and created in the Vessel folder. The Standard Vessel Profile option is selected from the Profile Options drop-down list. Its overall dimensions are summarised in the table below.

Table: Properties of ‘Vessel’

Property

Value

Length

175 m

Depth of Keel below Origin

12.5 m

Horizontal Offset from Origin

0 m

Create Solid Profile

No

 

Vessel Offset Component

The Vessel Offset component is used to specify the static offset that is to be applied to a vessel in an analysis. In this example there is only Vessel Offset component, named ‘0.5m Offset’, which defines a negative surge offset of -0.5m.

 

Seabed Component

A single Seabed component is created in the Model folder, named ‘Elastic Seabed’. A seabed stiffness of 100kN/m/m is specified and the remaining default properties for an elastic seabed are left unchanged.

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