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