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51317--9786-Risk Analysis for Assessing AC Corrosion in Trasnmission Pipelines

Expansion has increased the risk of AC in pipelines. In this work, calculations of induced AC voltage and current are performed for scenarios involving: HVAC transmission powerline configuration, lateral distance to the transmission pipeline, and parallelism between the transmission lines, soil, and pipeline and coating properties. 

 

Product Number: 51317--9786-SG
ISBN: 9786 2017 CP
Author: Alfonso Garcia Rojas
Publication Date: 2017
Industry: Energy Generation
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$20.00
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The development of transport systems fed with AC power hasincreased the risk of AC in transmission pipelines and awareness of pipeline integrity engineers. Several works have proved the detrimental effect of AC current on pipeline safety and corrosion of catholically protected pipelines.AC may be imposed on the pipelines through three different coupling mechanisms resistive coupling capacitive coupling and inductive coupling but the resistive coupling and inductive coupling mechanisms promote AC corrosion during pipeline operation. In resistive coupling the presence of a short circuit in the AC power due to a lighting strike or a steady state current leakage may discharge current on a nearby pipeline increasing the pipe to soil voltage coating stress and likelihood of electric shock hazard at above grade pipeline appurtenance. In inductive coupling the magnetic field produced around the power conductors generates an electrical field along a parallel pipeline inducing a voltage that interferes with the CP system and promote corrosion.On this work calculations of induced AC voltage and AC current are performed for multiple scenarios considering important factors such: HVAC transmission powerline configuration lateral distance to the transmission pipeline and parallelism between the transmission lines soil pipeline and coating properties. In addition a risk analysis is conducted based on sensitivity analysis of the factors uncertainties and probability distributions to identify locations with higher AC corrosion susceptibility.

Keywords: HVAC transmission powerline, AC current, AC voltage, Interference, Propagation, Impedance, parallelism, inductive coupling, sensitivity analysis, corrosion management.

The development of transport systems fed with AC power hasincreased the risk of AC in transmission pipelines and awareness of pipeline integrity engineers. Several works have proved the detrimental effect of AC current on pipeline safety and corrosion of catholically protected pipelines.AC may be imposed on the pipelines through three different coupling mechanisms resistive coupling capacitive coupling and inductive coupling but the resistive coupling and inductive coupling mechanisms promote AC corrosion during pipeline operation. In resistive coupling the presence of a short circuit in the AC power due to a lighting strike or a steady state current leakage may discharge current on a nearby pipeline increasing the pipe to soil voltage coating stress and likelihood of electric shock hazard at above grade pipeline appurtenance. In inductive coupling the magnetic field produced around the power conductors generates an electrical field along a parallel pipeline inducing a voltage that interferes with the CP system and promote corrosion.On this work calculations of induced AC voltage and AC current are performed for multiple scenarios considering important factors such: HVAC transmission powerline configuration lateral distance to the transmission pipeline and parallelism between the transmission lines soil pipeline and coating properties. In addition a risk analysis is conducted based on sensitivity analysis of the factors uncertainties and probability distributions to identify locations with higher AC corrosion susceptibility.

Keywords: HVAC transmission powerline, AC current, AC voltage, Interference, Propagation, Impedance, parallelism, inductive coupling, sensitivity analysis, corrosion management.

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