Pipeline polarized potential attenuation is supposed to be IR-free pipe-to-soil potential distribution along a pipeline. Currently, most of the potential attenuation calculations in published documents or in CP training manuals are either a pure IR drop attenuation or attenuation that contains IR drop1, 2, 3, 4, 6 . Polarization and IR drop are caused by applying current to the pipe surfaces. When current density distribution along a pipeline is determined, the attenuation of cathodic polarization (IR free potential shift) can be established. Current density is restrained by both pipe to soil resistance and pipe polarization resistance. This article uses current density attenuation and polarization resistance to determine the polarization (IR-free potential shift) attenuation.

Subject
Voltage drops, Piping, Cathodic protection, Pipe to soil potential, Pipelines, Soil resistivity, Electrical conductance, Current densities, Coating breakdown, Electric potential, Attenuation, Polarization, Polarization resistance
Keywords:
Attenuation, Polarization resistance, IR-free potential
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2022
Association for Materials Protection and Performance (AMPP)
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