Pipeline cathodic protection designs and AC interference studies, whether completed using conventional calculations or computer modeling, are heavily dependent on the quality of the pipeline’s coating. Coating resistance is often coarsely estimated using established values from literature where pipeline age, coating type, and subjective Operator […]
An AC interference study was conducted in 2021 following a utility development with the addition of a high voltage AC powerline in Alberta, Canada. The study comprised of 11 pipelines and 4 powerlines collocating in several stretches totalling approximately 50 km of collocation, with various […]
AC interference between co-located pipelines and high voltage AC powerlines can result in safety hazards to operating personnel and the public under powerline steady-state and fault conditions. Under steady-state conditions, AC voltages are induced on the pipeline via electromagnetic coupling. Under fault conditions, high AC […]
Computer modelling and simulation holds the promise of improved outcomes and more efficient resource allocation. However, attaining these results requires careful consideration of model inputs, robust mechanistic or probabilistic characterizations, delineation of assumptions, validation of outputs versus available data, and the appropriate use of model […]
Coating resistance or conductance values are critical input parameters for the accurate modelling and design of AC mitigation and cathodic protection (CP) systems for pipelines. However, there are relatively few sources for real-world coating resistance values in the literature. To attempt to fill this gap, […]
An AC interference study was conducted in 2019 following a utility development project that included constructing a new substation and upgrading approximately 24 km of new AC transmission powerline sections in Alberta, Canada. The study comprised six transmission powerlines owned by one utility and eight […]
The long-term service life outcomes were compared for similar natural gas storage wells operated with either no cathodic protection or partial cathodic protection. Cathodic protection for storage wells is not mandated by regulation and industry practice varies so the outcomes for more than 350 wells […]
Pipeline operators are becoming more dependent on coupons for demonstrating adequate cathodic protection as the use of multi-line corridors has increased. In such complex right-of-way configurations, the pipelines are often bonded together for cathodic protection purposes. The presence of widely varying coating qualities and current […]
The new NACE Standard SP21424-2018 provides a set of simple criteria for assessing the risk of AC corrosion on existing collocations between powerlines and cathodically protected pipelines. However, the task of developing design criteria for new collocations is left to the pipeline operators. This paper […]
Trenchless technologies are increasingly used to install pipelines at crossings with environmentally sensitive features, highways, etc. For deep crossings installed in rock via horizontal directional drilling (HDD), there has been concern within the pipeline industry about the effectiveness of conventional monitoring and cathodic protection techniques. […]
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