Analysis Component

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Analysis Component

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The Analysis component is used to specify the various inputs for a PipeLay analysis. The Analysis component allows you to gather together a set of components of various types, such as pipelines, vessels, waves and so on, from all of those defined in a project file, and to perform various types of analyses using these components. In this example, the Analysis component is named ‘Start-up via Stab & Hinge Analysis’. The following sections provide a description of the various inputs for the analysis.

 

Properties Tab

The Properties tab allows you to specify the options that are to be applied to all analysis stages of a particular model. In this example the Model is selected as ‘Model’ and the Contact Modelling option is defined as Simple.

 

Installation Stages Tab

The Installation Stages tab is where you define the various stages in your analysis. In this example, there are nine static installation stages.

 

Parameters Tab

The Parameters tab allows you to specify which parameters you want to change during each analysis stage defined on the Installation Stages tab. A summary of the parameters changed in each stage of this example is provided in the table below.

Table: Summary of Parameter Changes

Stage Number

Parameter

Value

1

Constraint at Seabed Connection

Turned Off

1

Length of 18’’ pipe

230 m

2

Length of 18’’pipe

530 m

3

Length of 18’’pipe

830 m

4

Length of 18’’pipe

1160 m

5

Constraint at Seabed Connection

Turned On

5

100m Offset

Add

5

Length of 18’’pipe

1205 m

6

Length of 18’’pipe

1305 m

6

100m Offset

Add

7

50m Offset

Add

8

Length of 18’’pipe

1355 m

8

50m Offset

Add

9

Length of 18’’pipe

1405 m

9

50m Offset

Add

 

 

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Criteria Tab

On the Criteria tab, you can specify installation criteria for each installation stage that is created in the Installation Stages tab. In this example, no criteria are required for the first four stages. For the last five stages, the maximum Von Mises stress in the sagbend region must be between 250MPa and 350MPa, as detailed in the tables below. The tolerance parameters are set to their defaults.

Table: Criteria Properties

Property

Value

Criteria

Von Mises Stress

Component Name

Pipeline(1)

Location

Sagbend

Minimum Value

250 MPa

Maximum Value

350 MPa

Iterate On - Type

Fixed Connection Point

Iterate On - Name

Seabed Connection

Iterate On - Vector

Global Y

 

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Summary Postprocessing Tab

You can use the Summary Postprocessing tab to request output from various parameters at crucial locations throughout the installation process. In this example, a number of parameters are selected for summary postprocessing, as detailed in the table below.

Table: Summary Postprocessing

Type

Component

Parameter

Length 1

Length 2

Motion

Pipeline(1)_18’’ Pipe(1)

DOF - 1

0 m

0 m

Criteria

Pipeline(1)

Von Mises Stress - All

-

-

Criteria

Pipeline(1)_18’’ Pipe(1)

Tension - End

-

-

Criteria

Lay Vessel(1)

Departure Angle

-

-

 

 

Running the Analysis

You are now ready to run the analysis. While the analysis is running, you can observe the analysis progress and check for warnings or errors on the Progress tab.

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