Northern Canada's permafrost and semi-permafrost environment is a huge challenge for designing and engineering underground pipelines, and a critical aspect of protecting both the pipeline and this sensitive environment involves the design of an effective corrosion protection system.
One of the most common methods to protect buried infrastructure—such as oil and gas transmission pipelines —from corrosion is the application of an external coating.
"Although great advances have been made within the past 30 years in terms of coatings reliability and longevity, it's still desirable to implement a back-up plan: cathodic protection," says Paul Duchesne, manager of media relations for Natural Resources Canada.
What is cathodic protection? It's a method used to protect buried pipelines from corrosion, which involves attaching sacrificial anodes to a pipeline's coated steel. Sacrificial anodes are more electrically active than steel, so corrosive currents exit through the anodes rather than the steel.
Since the implications of partially frozen ground on a pipeline's cathodic protection system weren't entirely clear, Natural Resources Canada researchers decided to explore and evaluate the use of cathodic protection in permafrost regions.
In a paper published in CORROSION journal, the researchers explain how cathodic protection systems function at low temperature and describe the various aspects of cathodic protection application in sub-zero temperatures.
The researchers concluded that the application of cathodic protection systems may provide long-term protection of the infrastructure from corrosion when combined with high-performance coatings—as long as the system is designed and operated to overcome high electrical resistance frozen phases.
"Ultimately, we hope that our research will contribute to the safe and reliable operation of underground infrastructure such as oil and gas transmission pipelines, production facilities, and storage tanks," says Duchesne.
More Information:
The paper, "Applicability of Cathodic Protection for Underground Infrastructures Operating at Sub-Zero Temperatures," by Sankara Papavinasam, Tharani Pannerselvam, and Alex Doiron, appears in NACE International's journal, CORROSION, Sep. 2013, Vol. 69, No. 9, pp. 936-945. See: http://dx.doi.org/10.5006/0881
About NACE International: Founded in 1943, NACE International, The Corrosion Society, serves 30,000 members in 130 countries. Based in Houston, Texas, with offices in the U.S., China, Malaysia, and Saudi Arabia, the organization reaches all industries impacted by corrosion and offers the most specified technical training and certification programs, conferences, industry standards, reports, publications, and software to prevent and mitigate corrosion. NACE International provides members with career and business building resources, government relations and public awareness support, and research and education to support the pursuit of global corrosion control solutions.
CORROSION is a technical research journal devoted to furthering the knowledge of corrosion science and engineering. The technical articles selected for publication in CORROSION provide a permanent record of the latest progress in the science and technology of corrosion control. The journal is directed at scientists and engineers concerned with the phenomena of corrosion processes and the protection of materials in corrosive environments. For more information, please visit http://corrosionjournal.org.
Journal
CORROSION