OrcaFlex Analysis

Tramontana Engineering is specialized in Cable and Pipeline Integrity analysis using OrcaFlex Software. By performing static and dynamic OrcaFlex analysis, installation operations can be carried out, marine warranty can be guaranteed and workability assessments can be provided.

Using hands on experience, tailor-made solutions can be provided for different offshore operations using the OrcaFlex software. Tramontana Engineering has experience in performing these analyses for a fast amount of offshore windfarms and is known to provide very quick and high quality analyses results. Using smart setups of the models, Pull-ins can be performed in very short time frames. This is highly beneficial for last minute adaptations in the project schedule, upgrading environmental limits offshore and increasing weather windows by performing quick analyses during the project execution; reducing or avoiding potential downtime during the project execution.

Pipeline Installation Analysis
For pipeline installation operations, OrcaFlex can be used to perform, among others; Stab-in, Midline tie-in, Abandonment and Recovery and Normal Lay operations.

For these operations OrcaFlex can be utilized to model the stinger setup on the pipelay vessel or model the vertical lay tower. The analyses shall provide the integrity limits of the pipe and provide the weather conditions in which the pipe can be installed.

Apart from actual pipeline installation analyses, OrcaFlex is a good tool to perform Free Span analysis of a future pipeline route as well as as-laid pipelines.

Cable Installation
For cable installation we can make a distinction in between several offshore operations, such as pull-ins, joint installation and normal lay. Tramontana Engineering is specialized in providing engineering support during OrcaFlex workscopes as well as preparing solid OrcaFlex models and reports.

Normal Lay
Normal Lay analyses of Cable installation goes further than the static laytables used on board of the vessel. At Tramontana Engineering, normal lay analyses include among others: Survival Analyses during vessel standby operations, Curve stability analyses to ensure the cable remains on the RPL during cable lay, Abandonment and Recovery analysis in case of lowering or retrieving a cable from the seabed and of course the normal lay analysis itself to ensure the vessel knows at what layback range the cable can be installed under which environmental conditions.

First end pull-in
First end pull-in models are prepared for First end pull-ins at Offshore Substations and/or Monopiles/Wind Turbines. The models will prepare the offshore crew with suitable laytables as well as the weather limitations in which the pull-in can be performed.

Second end Pull-in

Second end pull-in models follow the same principle as the first end pull-in models, however now the pull-in will be performed using a quadrant on board the cable lay vessel. Tramontana Engineering can provide the vessel specific Second end Pull-in models, laytables and weather limitations to be used for Client and Marine Warranty acceptance.

Joint Installation
When a cable repair has to be performed or when a cable route is too long to install in one length, an offshore cable joint is required. Tramontana Engineering has experience on several offshore cable installation projects where these joints had to be installed or planned for. Tramontana Engineering has provided offshore contractors with working inline joint and omega joint overboarding analyses using OrcaFlex. Using these analyses, the client is able to determine the best way forward in terms of how to install a joint while respecting the cable’s integrity parameters, the vessel capabilities and providing a workable weather window. Furthermore, the joint analysis shall provide information that can be added in the work method statement.

Typical Example of a Joint Overboarding model in OrcaFlex
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