External coating testing for pipeline directional drilling installations or informally “Bore Test”. It is a very much requested test in Alberta, Canada. The conditions of the installation are severe for the integrity of the external coating. So, a procedure has been developed after the involvement in several projects. This presents the synergies between field data and cathodic protection theories. Two different field tests are presented by using DC and AC power sources furthermore a theoretical calculation but with given field data. Also, it is introduced a specific theory how to get the resistance of the soil. As the results, pipe-to-earth resistance was similar for both field tests and consistent with the theoretical calculation given field resistivity data. Any HDD external pipeline coating integrity evaluation has its own limitations. Such as, site conditions, backfill settle, aboveground survey techniques access, as well as suitable equipment. Bore tests are run in different conditions therefore it is important to understand the engineering theories for these field tests.

Subject
Electric current, Test methods, Voltage drops, Piping, Cathodic protection, Pipelines, Soil resistivity, Installation, Pipe sections, Horizontal directional drilling, Electrical resistance, Soil, Remote earth
Keywords:
Bore test, Horizontal Directional Drilling, Coating Damage, Coating Integrity, Cathodic Protection
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2021
Association for Materials Protection and Performance (AMPP)
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