Process & Pipelines

Polytec has offered specialised services to the most demanding O&G operators for decades. Polytec  is located close to one of Europe’s biggest and most advanced gas processing plant, Kårstø, and to the main office of Gassco, the operator of the largest subsea pipeline network in the world.

Complex and varied requirements has turned in to a broad spectre of expertise and a large network of international competence. Polytec is today one of the most complete suppliers of subsea pipeline study and R&D services in the world.

We can help you with anything from Oceanographic services, advanced flow assurance, structural analysis, onshore and subsea processing, leak detection, survey and inspection and much more.

Flow Assurance

Polytec is a complementary supplier within the field of flow assurance. To ensure increased flow capacity of oil and gas from the Norwegian shelf to Europe we have developed world leading expertise about what’s going on outside the pipelines, inside the pipeline and with the pipeline itself.

Polytec has in-depth knowledge about sea floor temperatures and using our state-of-the-art sea floor temperature model we can predict temperature fluctuations over time and distance. Combined with our work improving the flow models of the gas inside the pipes we keep on pushing the flow capacity boundaries for our customers.

Polytec products and services also include leakage detection and modeling, flow simulations, local and global structural analysis of pipelines, damage analysis and pipeline network analysis.

Examples of services we provide:

  • Development of multiphase pipeline philosophy (Pigging/hydrate/wax formation/etc)
  • Development of CO2 pipeline philosophy (Operational impact on phase)
  • Capacity estimation and design of pipeline infrastructure (Evaluation of capacity based on operational data and determining diameter and steel thickness for new pipelines)
  • Evaluation of leak detection methods (How sensitive are the method/what causes false alarms?)
  • Independent assessment of pipeline modeling software (How accurate are the steady-state/transient models?)

Polytec has developed its own pipeline code which gives us full access to all parameters and detailed knowledge of how the calculations have been performed.

Polytec has strong groups within both oceanographic and pipeline modeling allowing us to provide service including not only pipeline modeling, but also the input from oceanographic models.

Polytec delivers complementary flow assurance services.

Polytec delivers complementary flow assurance services.

Metocean Design Basis (MDB)

A metocean design basis is the combined information from detailed analyzes of meteorological and oceanographic variables. The report is the basis for design and planning of operations on offshore and land based installations. Examples of data that are subject to statistical analyzes in a metocean design basis are wind, wave, current, temperature and salinity data. In addition, ocean models are used to complement the in situ observations.

Experience – Domestic and International Projects

Polytec has more than a decade of experience in producing Metocean Design Basis, with customers including highly significant actors in the oil and gas industry, such as Statoil and Gassco. Polytec’s operations are worldwide.

Locations where Polytec has performed MDB analysis industry can be seen in the figure. Oil & gas in blue and wind power in green.

Locations where Polytec has performed MDB analysis industry can be seen in the figure. Oil & gas in blue and wind power in green.

CO2

Over the last eight years Polytec has built up considerable expertise in the field of pipe transmission of CO2. Future CO2 capture and storage sites are expected to be at considerable geographic distances. Pipeline transport is usually the safest and most cost effective option to get the CO2 from the capture plant to the storage site. The project portfolio over the years has included different aspects of the thermodynamics, flow modeling, flow assurance and safety aspects of pipeline transmission of CO2. Work has been carried out for a range of customers, including Gassco, Total, Shell, DnV, Gassnova and the Norwegian Research Council. Worth mentioning here are the flow assurance studies conducted within the DnV CO2 Pipetrans project. Phase one of CO2 Pipetrans lead to DnV writing the first recommended practice for pipeline transmission of CO2.

Read more ›

Leak Detection

Third party incidents such as anchor dropping or trawl boards can potentially threaten the integrity of the pipeline subsea. Digging with an excavator can potentially threaten the integrity of the pipeline onshore. To avoid this, it is important to be able to detect these incidents early. The leak detection project has been established with the aim of detecting third party incidents and leaks with better accuracy than today. We have been developing and tested several different sensors in this project. In the the Joint European project in Gas European Research Group(GERG) – we tested different intrusive hydrophones for onshore shock detection. We did impact testing on gas pipelines in Belgium and in France. The results show that impacts on the pipeline can be detected with this type of technology.

CFD simulation of rupture of a subsea CO2 pipeline. Dense phase CO2 inside the pipeline (red colour) is flowing out from a small hole in the pipeline into the seawater.

CFD simulation of rupture of a subsea CO2 pipeline. Dense phase CO2 inside the pipeline (red colour) is flowing out from a small hole in the pipeline into the seawater.

Structural Simulation (FEA)

Polytec offers a complete range of finite element analysis (FEA) and consulting services at cost effective rates to worldwide clients.

Services We Provide

Polytec offers the following Finite Element Analysis services to our clients:

  • Linear & Non-linear Analysis: Response of structure to critical loads and modeling of contact (allowing analysis of assemblies), non-linear material behavior and large deformations
  • FEA Dynamic and Static Analysis
  • Thermal Analysis & Modeling
  • Lifting Analysis
  • Stress Analysis
  • Structural Analysis
  • Fatigue Failure analysis
  • Multi-body Dynamics Simulation
  • Buckling Analysis
  • FE Mesh Generation
  • FEA Modeling

Software we use

Pipeline Simulation

Accurate modeling of pipeline transport of gas requires a model that gives a good representation of the physics governing the fluid flow as well as good representation of how the system interact with the surroundings.

A model of the system means a good 1D representation that one can solve numerically. As such what approximations are valid in the operational area of a given pipeline? What numerical method should be used to ensure stability, accuracy and speed?

Representing the surroundings well involves accurately modeling the heat transfer between transport fluid and ambient, as well as having reliable data for ambient temperature and velocity.

Read more ›