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February 28, 2018 / Fari Mahdavi
Category: Research Projects 

New Research Reports February 2018

Since July 2017, 18 research reports have been released by the researchers active across the four main research programs of the Energy Pipelines CRC. Highlights of recent findings on two of our projects: “Cathodic protection shielding under disbonded coatings” and “Prediction-based decision support framework for energy pipeline integrity management” are provided below. The highlights are followed by the full list of recent research reports.

Key factors affecting cathodic shielding and the corrosion under the disbonded coating

Cathodic shielding is widely believed to cause corrosion under the disbonded coatings. Currently there is no standard practice for quantifying the effects of cathodic shielding on pipeline corrosion. Project “RP2-12: Cathodic shielding under disbonded coating” aims to generate reliable knowledge and experimental evidence for quantifying the influence of cathodic shielding on corrosion under disbonded coatings.

The recent report on this project (milestone 7) released by the researchers at Deakin University updates on a series of simulation tests which have been carried out to verify the effects of coating’s disbondment geometries (e.g. length and gap size) and environmental conditions (e.g. soil saturation) on corrosion under disbonded coating films. These tests reveal that CP shielding would not necessarily result in corrosion under disbonded coating when the coating disbondment geometries and environmental conditions are appropriate.

Further research will be done to identify suitable coating types, coating thicknesses, coating application methods, coating aging, coating disbondment geometries and weather conditions for achieving ‘non-shielding’ pipeline conditions in the event of disbondment.

A compiled integrity management process to establish the lowest cost strategies for asset integrity

Engineering asset management plays a key role in enabling an enterprise to optimise cost, maintain a safe operation by controlling associated risks, and to address the sustainability of assets in operation. Research project “RP2-15: Prediction-based decision support framework for energy pipeline integrity management” involves a comprehensive research program so as to achieve the goal of extending the service life of pipeline infrastructure by mitigation of environmentally induced degradation and corrosion, and to develop a holistic approach for pipelines life prediction and asset management.

A recent report resulting from project RP2-15 (milestone 4) updates on compiling an integrity management process which utilises available data to establish efficient strategies for maintaining integrity of the asset at a specified level of risk. This process is specifically designed for situations where in-line inspection (ILI) data is available. Where this is not the case, the implications for the process and the method for its adaptation have been identified. This is achieved through quantification of the rate of degradation of the pipe wall.

In this project a process for pipeline degradation modelling based on a Markov Chain Monte Carlo (MCMC) approach is already completed and a guideline to use this approach is being drafted.

The following recent research reports are available on our website:

RP6.2-05: High voltage holiday testing of dual layer FBE

  • Milestone report 4: Determining the required voltages for holiday testing dual layer fusion bonded epoxy coatings after leaving the coating applicators site.

RP2-16: Assessing coating integrity and CP efficiency of HDD pipelines

  • Milestone report 7: Evaluation and development of testing methodologies for assessing the coating integrity of horizontal directional drilling (HDD) pipelines.

RP4-25: Effectiveness of External Interference Protection Controls

  • Final report: Assessment of physical and procedural controls outlined in AS2885 used to protect pipelines against external interference.

RP4-26: Technical and economic regulation

  • Milestone report 3: The impact of economic regulation on long term safety outcomes.

RP2-12: Cathodic shielding under disbonded coating

  • Interim report: Detailed report on the results of the performance of selected coatings and the effects of CP and environmental conditions.

RP2-14: Pipeline condition monitoring sensors

  • Interim report: Detailed report on field research findings on the performance of the integrated Pipeline Corrosion Monitoring system.

RP2-15: Prediction-based decision support framework for energy pipeline integrity management

  • Interim report: Development and trial of integrity management system process.

RP3-13: EPCRC Fracture velocity model

  • Interim report: Validation of EPCRC fracture velocity model

The following research reports are currently out for industry review:

RP3-11B: Gas pipeline vent design and operation- Study E

  • Milestone report 6: Characteristics of natural gas pipeline blowdowns in built-up (populated) areas.

RP6.2-05: High voltage holiday testing of dual layer FBE

  • Milestone report 5: Determining the required voltages for holiday testing dual layer fusion bonded epoxy coatings after leaving the coating applicators site.

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