Midstream and Downstream Oil & Gas

Reliability-based Limit State Design and assessment corrosion criteria have been developed as part of a joint industry project to optimize corrosion mitigation for vintage pipelines. The criteria is calibrated to meet specific reliability targets within a certain tolerance but does not require probabilistic calculations for application. Comparison of the criteria to the CSA Z662 and TransCanada’s in-house reliability-based criteria was undertaken to evaluate the performance of the criteria.  

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A leak detection evaluation framework for onshore transmission pipelines has been developed in conjunction with PHMSA. The framework is to be used by pipeline operators to evaluate and verify leak detection systems that operate external to the pipeline, specifically those with the ability to detect small leaks.

In addition to developing the framework, we have shown how the developed framework can be used through a demonstration exercise, which involved assessing the ability of candidate...

C-FER Technologies will be at the 2019 Banff Pipeline workshop. Booth information coming soon. 

A limit states design approach has been developed for geotechnical loads. The approach uses a strain based design format and requires the user to develop probability distributions for the maximum strain demand and minimum strain capacity.

Checks are provided for both local buckling and tensile rupture, which are calibrated to meet specified risk-consistent reliability targets. The safety factor and the criteria used to define the characteristic strain demand and capacity are defined as functions...

Quantitative risk analyses are used in the pipeline industry to identify high-risk locations and main contributing threats; to evaluate risk against an acceptance criterion; to evaluate changes in risk over time; to guide integrity management decisions; and to demonstrate regulatory compliance.

We developed for the U.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration (PHMSA) guidelines for the development and application of pipeline quantitative risk analysis...

Corrosion assessment criteria in current standards for onshore transmission pipelines rely on safety factors that are experience-based, with their implication on the risk or safety level associated with the pipeline unknown.

Working as part of a joint industry project, we have developed reliability-based corrosion assessment criteria in a deterministic format that are calibrated to achieve a specified safety level. The main features of the criteria are:

  • Inclusion of calibrated safety factors...

A limit states design approach for onshore pipelines has been developed with reliability-based design rules for geotechnical loads. In consideration of the modelling complexity of the soil movement mechanisms and pipe-soil interaction, and to allow for flexibility to incorporate future model developments, the design rule formation is directly based on the distribution parameters of the strain demand and capacity of the pipeline.

Working as part of a joint industry project, we used the structural...

Spirally welded pipelines (extensively used in liquid transmission pipeline systems) may contain manufacturing anomalies that are susceptible to fatigue growth. To account for the angle of these cracks with respect to the longitudinal pipe axis, modifications to inputs of crack assessment models are required.

Using the widely-used pipeline assessment model CorLAS®, we worked with Enbridge Pipelines to investigate two input modifications:

  • Consideration of the normal stress component...

The pipeline industry has established various methodologies to estimate corrosion growth in pipelines. However, growth of corrosion feature length is inconsistently addressed in these methods.

We worked with Enbridge Pipelines to review these methodologies and determine the impact of feature length on corrosion burst pressure predictions.

This review:

  • Considered methodologies that are applicable to both feature lengths and depths
  • Evaluated the methodologies’ abilities to identify unsafe defects...

A limit states design approach has been developed for geotechnical loads using a strain-based design format. This approach addresses the high level of uncertainty associated with the loading processed, which has limited the availability of design guidance in the past.

Working as part of a joint industry project, we have carried out a project to calibrate risk-consistent limit states checks that can be used for a range of strain demand and capacity distributions applicable to geotechnical loads.

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