On this page
- 'Parametric run' and 'Generate Runs' generate 'Compile error in hidden module: ParametricRuns'
- Modelling piggy-back pipelines in StableLines
- Specifying a lower friction coefficient
- What are the differences between Pipeline Engineering Tool (PET) and DNV-OS-F101 code compliance?
- What are the differences between Pipeline Engineering Tool (PET) and Stablelines?
- Why can I not specify a trench depth greater than the diameter of the umbilical?
'Parametric run' and 'Generate Runs' generate 'Compile error in hidden module: ParametricRuns'
Applies to Version 1.3-05
When pressing the 'Parametric Runs' and 'Generate Runs' buttons in the main sheet, the following error message pops up:
Compile error in hidden module: ParametricRuns...
This is a bug in StableLines V1.3-05 and has been fixed in version V1.4-01.
WORKAROUND
The sheet 'Parametric runs' already exists in StableLines v1.3-05 that comes with the StableLines installation package. Input data from 'Main' sheet can manually be copied and pasted into row 12 in the 'Parametric runs' sheet. This row can then also be copied manually to the desired number of runs using standard Microsoft Excel functions. When the desired parameter is updated for all the runs (rows) the 'Calculate' button can be clicked as normal, and all the parametric runs will be calculated.
Modelling piggy-back pipelines in StableLines
There's not an explicit function for modeling piggy-back in Stablelines, but one can, for example, use one of the coating layers to model equivalent total diameter. Then adjust the layer's density to get the correct submerged weight.
Specifying a lower friction coefficient
From version 1.3 of Stablelines you can, for absolute stability, specify a lower friction coefficient than the default value.
This feature is not supported in any versions prior to version 1.3 of Stablelines.
What are the differences between Pipeline Engineering Tool (PET) and DNV-OS-F101 code compliance?
Both tools comply with DNV-OS-F101, but PET module is more suitable for early design.
| PET v4.0.2 | Code Compliant Spreadsheet v3.3-01 | |
|---|---|---|
| Complies with | DNV-OS-F101 | DNV-OS-F101 |
| Batch calculations | No | Yes |
| Possibility to make custom excel plots from the parametric runs (batch) functionality | No | Yes |
| Automatically calculates fabrication factor, girth weld factor and derating when double clicking the cells | No | Yes |
| Calculates for safety class Very High | No | Yes |
What are the differences between Pipeline Engineering Tool (PET) and Stablelines?
PET is great for quick checks of on-bottom stability for a given pipeline, but is normally cumbersome to use in detail on-bottom stability design compared to StableLines.
| PET v4.0.2 | StableLines v1.5-02 | |
|---|---|---|
| Complies with | DNV-RP-F109 | DNV-RP-F109 |
| Stability criteria covered | Only 10D | Absolute Stability, 0.5D, 10D and Intermediate (user defined between 0.5D and 10D) |
| No. of simultaneous environmental load cases | 1 | 12 in Main Sheet. Practically unlimited in the Parametric runs module |
| Coating specifications | 1 layer Up to 5 layers + CWC if utilizing “Weight and Volume Calculations”, but this would change pipeline cross section for all PET calculation modules | 5 layers + CWC + Marine growth |
| Optimization | Suggests required added Steel or CWC thickness | Suggests required added Steel or CWC thickness. Suggests reduction in Steel or CWC to optimize required submerged weight. Both functions may be turned off to increase calculation speed (useful for batch calculations). |
| Soil | Sand and Clay | Sand, Clay, Rock, User defined. Allows for user defined initial penetration. Allows for effect of water-filled pipeline installation on initial penetration. |
| Evaluation of trenching | No | Yes |
| Batch calculations | Limited to Pipe sectioning | Yes, on any parameter. Practically unlimited number of calculation runs per batch. |
| Visualization | No | Predefined plots such as required submerged weight vs. environmental cases and necessary concrete thickness vs concrete density. In addition all of Microsoft Excel’s plotting tools are available for quick and powerful visual presentations results from batch calculations. |
| Flexibility | One design case at a time | Design for Temporary condition and Operational condition for up to 12 environmental cases simultaneously |
| Reporting | Reports to PDF | Reports to PDF, or Copy and paste directly into word editor |
Why can I not specify a trench depth greater than the diameter of the umbilical?
Applies to Version 1.3
The load reduction factors due to trenching as given in equations (3.21) and (3.22) in DNV-RP-F109 are not valid for trench depths larger than the umbilical’s/pipeline’s outer diameter. This is because the experiments that form the basis for these reduction factors were only performed for trench depths of up to z_t/D = 1.0. i.e., we don’t have a proper data basis to say that the trench reduction factors apply for deeper trenches than z_t/D = 1.0.
In StableLines v1.2 it was up to the user to keep within these limits. In StableLines v1.3, z_t/D is automatically set to 1.0 if the user inputs z_t/D > 1.0.