Thi Bich Ngoc Nguyen
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The first phase of this project has established greater industry understanding of the behaviour of concrete-coated pipelines. In particular:
- Concrete strain can be evaluated more accurately. This may form the basis for a relaxation in the concrete crushing criterion of current codes and standards
- Non-linearity at the field joint section in high nominal strain affects fracture and fatigue assessment of the girth weld
- The database for the cohesive property of modern corrosion coatings is largely limited
- The presence of field joint (FJ) infill material may change the behaviour of concrete weight coating (CWC) pipeline considerably.
- Significant reversed and combined loading complicates the CWC pipeline behaviour.
These important findings are based on a desktop study and now need to be validated with testing in the second phase of the project.
This project will perform full scale bending tests for selected pipe geometry, anti-corrosion coatings (ACCs) and loadings. It will also develop a database for the shear capacity of several popular modern ACCs. In addition, it will develop of an extensive database to help determine of concrete strain and hotspot stress through numerical analysis and Monte Carlo simulation. The project will develop a design guideline for the concrete coating for submarine pipelines.
- Relaxation on the stinger’s radius, allowing for wider range of weather window. This leads to significant saving of project costs
- Accurate determination of the strain concentration factor at FJ when the concrete coated (pipeline is subjected to nonlinear nominal bending strain
- Insights into the behaviour of concrete coated pipelines with high-strength FJ infill and the substantial reversed and combined loadings
- More flexible installation with respect to vessel, pipeline utilization and schedule
- Support integrity management of pipelines in operation
- Easy access to database on necessary parameters.
ValueSubstantial cost saving of as much as USD20 million for the installation of a 200-kilometre pipeline.
Thi Bich Ngoc Nguyen