AC Interference

AC Interference

AC Mitigation: 4 Approaches to Protect Your Assets

Pipelines paralleling high-voltage AC transmission lines require engineered grounding to prevent AC-induced corrosion and safety hazards. The four primary AC mitigation strategies—fault shielding, gradient control mats, lumped grounding, and gradient control wires—are detailed with design and monitoring guidance.

Stray Current Corrosion: Common Types of Stray Current Interference

Learn how DC stray current corrosion, AC interference, and telluric currents contribute to stray current interference and CP challenges.

The Race to AI Supremacy and How it Threatens Our Pipelines

The session highlighted the connection between the global competition for AI dominance, skyrocketing energy demands, and a growing threat to pipeline integrity across the United States.

[CASE STUDY] How MATCOR Delivered a Critical AC Mitigation Project—Ahead of Schedule and Powered by Teamwork

How MATCOR’s expert team completed a critical 20,000-foot mitigation project ahead of schedule—with zero incidents.

Explore BrandSafway’s Technical Seminars and Specialty Services

BrandSafway and MATCOR offer technical seminars on cathodic protection, rectifier operation, and AC interference mitigation. MATCOR-specific sessions—including Cathodic Protection 101 and Rectifier School—provide practical training for corrosion technicians and engineers.

The Impact of AC Corrosion Mitigation Criteria on the Design and Operation of Cathodic Protection Systems

NACE standard SP21424-2018 introduces DC current density as a key parameter in AC corrosion mitigation criteria, changing how cathodic protection systems must be designed, monitored, and controlled. MATCOR’s Ted Huck addressed these implications at the 2021 CORCON virtual conference.

Large AC Interference Mitigation Project in Southern Wyoming

MATCOR manufactured and installed over 73,500 linear feet of Mitigator® AC mitigation gradient control wire, three deep grounding systems, and remote monitoring units for a new pipeline-transmission line collocation in Southern Wyoming, completing the project one day ahead of schedule.

Transmission Line Monitoring Through Partnership with LineVision

MATCOR has partnered with LineVision to offer the PACT® solar-powered overhead transmission line monitoring system, providing pipeline operators with independent HVAC current and phase order data needed for AC interference modeling and compliance monitoring under NACE SP 21424-2018.

AC Corrosion Criteria: What It Is & How to Identify It

NACE SP21424-2018 establishes AC corrosion control criteria for cathodically protected pipelines based on time-weighted AC and DC current densities, with thresholds that vary depending on whether DC current density is controlled below 1 A/m².

AC Mitigation Video | Overview of Goals, Strategies and Materials

This nine-minute training video covers the goals, strategies, and materials used in pipeline AC mitigation. Topics include reducing fault condition current density, maintaining safe step and touch potentials below 15 volts, and using AC modeling to evaluate mitigated and unmitigated interference conditions.

AC Modeling Introduction Video

This training video introduces AC modeling for pipelines affected by high voltage transmission line interference. It explains when a best-guess mitigation approach is appropriate versus when detailed computer modeling is warranted to evaluate induced voltage, fault current, and step and touch potential impacts.

AC Interference – Basic Theory | Video Training Course

This 16-minute AC interference training video covers three primary effects on buried pipelines: the 15-volt safety threshold, fault condition interactions including conductive coupling, and AC induced corrosion. The course explains how high voltage power lines in shared corridors interact with parallel pipelines.

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