... density (J_AC and J_DC) on the AC corrosion rate. AC Corrosion AC frequency AC Interference AC Mitigation Cathodic Protection CP Ground Bed Rectifier 120 Hz Frequency Interference Unfiltered Rectifier Corrosion Investigation Pipeline INTRODUCTION A 2018 AC corrosion...

... excavations, conducted an AC interference study, and developed an enterprise wide program focused on identifying, monitoring, and mitigating AC interference. The paper examines the results of each mitigative action and process adjustment taken by the operator. AC Corrosion ILI AC Interference Interference...

...corrosion cathodic protection interference GIS area of influence map INTRODUCTION Abstract As Cathodic Protection (CP) becomes more and more of a common practice to reduce the risk of external corrosion, areas are becoming congested with CP systems. This is seen predominantly in shared right...

... was installed. This paper will present updated findings and results using AC modeling to determine the full extent of AC interference, faults, mitigation and their effects on the pipeline system. Steady State Voltage and Currents Fault Conditions Alternating Current (AC) Current Density Mitigation...

..., especially the demonstration of the failure mode of SSDs at the maximum failure conditions anticipated in our facilities: 45 KV for a duration of not less than 600 ms. Internal Stray Current Corrosion Interference Cathodic Protection Solid State Decoupler Corrosion Electrical Isolating Devices...

... of the elevated AC current densities and quantify the associated corrosion risk. The mitigation strategy employed to address this risk is provided. AC Corrosion AC Interference AC Mitigation Cathodic Protection CP Ground Bed Rectifier Interference Unfiltered Rectifier Corrosion Investigation Pipeline...

... Alternating Current (AC) Current Density Mitigation Interference Fusion Bonded Epoxy (FBE) Coat Tar Enamel (CTE) Fault Currents and Voltages Barnes Layer Soil Resistivity PROJECT OVERVIEW The pipeline operator decision to model the new mix of older pipe CTE coating with short segments of replacement...

... (410) 544-3232 office, (312) 661-2994 cell Often stray current (DC) interference is identified on a pipeline when the readings do not meet NACE criteria and there doesn’t seem to be a logical reason. Further investigation leads the corrosion engineer to suspect outside causes for the unprotected...

... bars, and may include effects of interference between multiple such bars grouped in fairly simple geometric patterns. Resistance to ground of real anode shapes may be very different from formula-based predictions even for single anodes, and computer-based simulation methods are now available...

... Conditions Alternating Current (AC) Current Density Mitigation Interference Fusion Bonded Epoxy (FBE) Coat Tar Enamel (CTE) High Consequence Areas (HCAs) INTRODUCTION In high consequence areas (HCAs) multiple underground facilities run under the country’s urban and suburban environments...

..., it fluctuated violently during the test, so the result had a weak regularity. Most of the off potential was too high to represent polarized potential. It included some kinds of interference, maybe from other coupons. So the polarized information could not be obtained from the test. Clearly the method of getting...

... 2 π l n l 2 + ( h + 2 p ) 2 h 2 + l 2 HVAC transmission powerline AC current AC voltage Interference Propagation Impedance parallelism inductive coupling sensitivity analysis corrosion management INTRODUCTION Enbridge ¹...

...Abstract The design rules used to design CP systems in the main do not take into account the interference between the anodes provided to protect a structure or interactions between the structures themselves. CP systems will always interact with each other to some extent when they are in the same...

...Case 1: A “large” stand-alone structure with 24 anodes Abstract It is generally accepted that destructive interference can occur between impressed and sacrificial cathodic protection systems, which can result in difficulty with control of the ICCP system, and which can also cause problems...

... pipeline AC/DC interference from transmission lines, electrical grounding system and complex electromagnetic environment analysis problems. Abstract As one of the most important ways for long-distance transmission of electricity, High Voltage Direct Current (HVDC) transmission lines in China...

...Cathodic protection galvanic anodes interference INTRODUCTION When performing a detailed CP design it is required to follow a set of defined design rules to secure an adequate CP system. There are several CP design standards and recommended practices both national and international...

... according to standards. The presence of AC interference may cause serious corrosion damage on metallic structures, even under CP condition. AC interference can take place by a conduction or an induction mechanism causing corrosion corresponding to coating defects, even if the -0.850 V CSE criterion...

... structures with poor coating or even without coating, such as tank bottom, grounding system, will consume large quantity of protective current and cause problems of interference and shielding, which brings challenges for the design of regional cathodic protection. In this work, several key technologies were...

... of this investigation offer a framework for clarifying ambiguous or misleading data that may results from the uncertainty that can occur when interfering electrical fields using indirect inspection surveys. CP ICCP Boundary Element Analysis BEA Interference INTRODUCTION Direct Assessment above ground surveys...

... and commissioning of CP system of electrically isolated new pipeline sections, with special emphasis on DC stray current interference due to existing anode ground beds and existing pipelines crossing/parallelism. Case studies are included, with discussions on results of interference testing, interference mitigation...