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Specific challenges encountered in the application of CP to thermally insulated pipeline risers in northern Alberta (Canada). The CP issues resulting from the use and installation of thermal insulation, resistance heating (heat trace), and other instrumentation are discussed.
Cathodic protection (CP) is a method to mitigate external corrosion on buried metallic pipelines. Electrical isolation and electrolyte homogeneity are key factors that influence the performance of the majority of pipeline CP systems. Based on these factors this paper details specific challenges encountered in the application of CP to thermally insulated pipeline risers in northern Alberta (Canada). The CP issues resulting from the use and installation of thermal insulation resistance heating (heat trace) temperature monitoring devices and other instrumentation will be discussed. Specific pipeline construction practices that increase the probability of these issues occurring will also be addressed. Best practices for providing CP to thermally insulated risers will be discussed along with the challenges of installation and monitoring.
Key words: cathodic protection, cathodic protection shielding, electrical isolation, thermal insulation, pipeline risers, thermally insulated pipelines
Here we would like to elaborate on corrosion risk associated with coatings that shield cathodic protection.
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The goal of this research was to improve the understanding of the mechanisms of cathodic protection (CP) by determining the interactions between corrosion and local chemical parameters, such as pH, under varying CP conditions, both in the absence and presence of MIC.
This paper will focus on design parameters required for cathodic protection (CP) of stainless steel screens with particular attention on design and operational current density values and suitable protection criteria. The detrimental effects of overprotection will also be discussed.