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 6

Project Sidebar for Example 6

 

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 6 - Start-up via Stab & Hinge

Job Number

1-2-3-342

Engineer(s)

Wood Group

Location

Galway

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 define the material properties for nonlinear X65 steel as listed in the first table below. The Material component is located in the Material folder and are named ‘X65 Steel’ in this example.

 

Table: Material Properties for ‘X65 Steel’

Property

Value

Young's Modulus

207 GPa

Shear modulus

80 GPa

Poisson’s Ratio

0.3

Mass Density

7850 kg/m3

Yield Strength

450 MPa

Allowable Stress

100 %

Allowable Strain

0.25 %

Expected Tension

500 kN

 

 

Stress-Strain Curve for ‘X65 Steel’

Stress-Strain Curve 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 ‘18" 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 ‘18’’ Pipe’

Property

Value

Outer Diameter

457.2 mm

Thickness

20 mm

Normal Drag

1

Normal Inertia

2

 

Line Component

At this stage, enough components have been defined to allow for the specification of the pipeline stack-up. The Line component added to the Line folder, named ‘Pipeline’, contains 1175 m of the Pipe Section component ‘18’’ Pipe’.

 

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 3 m. The properties of the ‘V-Rollerbox’ component are listed in the table below.

Table: Properties of ‘V-Rollerbox’

Property

Value

Support Length

0.75 m

Roller Length, L1

0 m

Roller Length, L2

1.5 m

Roller Length, L3

1 m

Roller Angle, Theta 1

30 deg

Roller Angle, Theta 2

90 deg

Contact Stiffness

5000 kN/m

Axial Rotation

0 deg

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Stinger Component

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

Table: Support Locations on ‘Stinger’

Support Name

X Coordinate (m)

Y Coordinate (m)

V-Rollerbox

4.8

-6

V-Rollerbox

4.8

-18

V-Rollerbox

4.8

-30

V-Rollerbox

4.8

-42

V-Rollerbox

4.8

-54

V-Rollerbox

4.8

-66

V-Rollerbox

4.8

-78

V-Rollerbox

4.8

-90

V-Rollerbox

4.8

-102

V-Rollerbox

4.8

-115

V-Rollerbox

4.8

-130

V-Rollerbox

4.8

-150

V-Rollerbox

4.8

-175

V-Rollerbox

4.8

-203

V-Rollerbox

4.8

-233

 

 

 

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Vessel Component

A Vessel component named ‘Lay Vessel’ is created in the Vessel folder. This component is used to model 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

220 m

Depth of Keel below Origin

15 m

Horizontal Offset from Origin

110 m

Create Solid Profile

No

The Vessel Reference Point is also defined on the Vessel component, the properties of which are listed in the table below.

Table: ‘Lay Vessel’ Reference Point

Property

Value

X Coordinate

0 m

Y Coordinate

125 m

Z Coordinate

0 m

 

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

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Table: ‘Stinger’ Location

Property

Value

X Coordinate

0 m

Y Coordinate

0 m

Z Coordinate

0 m

Stinger Angle

0 degrees

 

Table: Support Locations on ‘Lay Vessel’

Support Name

X Coordinate (m)

Y Coordinate (m)

Z Coordinate (m)

Zero Gap Guide

4.8472

128

0

V-Rollerbox

4.8

115.8

0

V-Rollerbox

4.8

103.2

0

V-Rollerbox

4.8

91.4

0

V-Rollerbox

4.8

79.2

0

V-Rollerbox

4.8

67

0

V-Rollerbox

4.8

54.8

0

V-Rollerbox

4.8

42.6

0

V-Rollerbox

4.8

30.4

0

V-Rollerbox

4.8

18.2

0

V-Rollerbox

4.8

6

0

Radii of Curvature are 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’

Radius of Curvature (m)

Y Coordinate (m)

Analysis Optimisation

250

36

No

100

-16

No

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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. This example contains two Vessel Offset components, named ‘50m Offset’ and ‘100m Offset’ respectively. ‘50m Offset’ defines a surge offset of 50 m while ‘100m Offset’ defines a surge offset of 100 m.

 

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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