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 ‘DMA Start-up 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 thirteen 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

2

Length of Pipeline(1)_16’’ Pipe(1)

200 m

2

50m Offset

Add

2

50m Offset

Add

2

50m Offset

Add

3

Length of Pipeline(1)_16’’ Pipe(1)

250 m

3

50m Offset

Add

4

Length of Pipeline(1)_16’’ Pipe(1)

300 m

4

50m Offset

Add

5

Length of Pipeline(1)_16’’ Pipe(1)

350 m

5

50m Offset

Add

6

Length of Pipeline(1)_ 16’’ Pipe(1)

375 m

6

50m Offset

Add

7

Length of Pipeline(1)_ 16’’Pipe(1)

425 m

7

50m Offset

Add

8

Length of Pipeline(1)_ 16’’Pipe(1)

500 m

8

50m Offset

Add

9

Length of Pipeline(1)_ 16’’Pipe(1)

550 m

9

50m Offset

Add

10

Length of Pipeline(1)_ 16’’Pipe(1)

575 m

10

50m Offset

Add

11

Length of Pipeline(1)_ 16’’Pipe(1)

625 m

11

50m Offset

Add

12

Length of Pipeline(1)_ 16’’Pipe(1)

675 m

12

50m Offset

Add

13

Length of Pipeline(1)_ 16’’Pipe(1)

725 m

13

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, the same criteria are specified for each stage, as detailed in the table below.

Table: Tension Criteria Properties 1

Property

Value

Criteria

Tension

Type

Line

Component Name

Pipeline(1)

Location

End

Minimum Value

300 kN

Maximum Value

301 kN

Iterate On - Type

Seabed Connection Point

Iterate On - Name

Seabed Connection

Iterate On - Vector

Global Y

Tolerance – Max Iterations

1000

Tolerance – Min Adjustment

0.001 m

Tolerance – Max Adjustment

10 m

Tolerance – Multi-Pass

Yes

In addition to the criterion above, an extra criterion was specified for stage thirteen, as outlined in the table below.

Table: Tension Criteria Properties 2

Property

Value

Criteria

Seabed Contact

Type

Pipe Section

Component Name

Pipeline(1)_16’’ Pipe(1)

Location

End

Minimum Value

0 kN

Maximum Value

1 kN

Iterate On - Type

Seabed Connection Point

Iterate On - Name

Seabed Connection

Iterate On - Vector

Global Y

Tolerance – Max Iterations

1000

Tolerance – Min Adjustment

0.001 m

Tolerance – Max Adjustment

10 m

Tolerance – Multi-Pass

Yes

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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

Criteria

Pipeline(1)_Start-up Head(1)

Component Height

Criteria

Pipeline(1)

Tension - End

Criteria

Pipeline(1)_ 16’’ Pipe(1)

Seabed Contact - End

Criteria

Pipeline(1)

Bending Stress - All

Advanced

Pipeline(1)

Vessel Position

Advanced

Pipeline(1)

Lay Back

 

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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