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Pipeline Integrity and Maintenance Services including Cathodic Protection and Vacuum Excavation

AC Corrosion and Mitigation

Dairyland PCR on Pipeline
AC mitigation cable
AC Corrosion Anomaly pit

Multiple Use Utility Corridors May Produce Hidden And Agressive Threats

Professionals at Point Integrity understand the importance of using mitigation systems in order to improve safety and/or control corrosion on pipelines affected by AC interference.

At Point Integrity we understand that AC interference is of concern for two very important reasons:

Personnel Safety • Step and Touch Potentials at 15 volts AC and above

• Conductive coupling from AC fault currents and lightning strikes

Accelerated Corrosion • Can be very severe at current densities above 20 Amps / M^2

We understand that Personnel Safety is a concern for not only people working on the pipeline, but for the general population located in close proximity to the interference.

Points of potential dangerous situations include:

• Above ground piping including block valves, bypass piping and pigging facilities

• Appurtenances such as valve operators, CP test stations and casing vent pipes

• Below ground piping where a cut during construction activities causes a “hot spot” for AC voltage accumulation.

OSHA Standard 2207, part 1926 along with NACE RP-0177-2000 both discuss keeping AC open circuit potentials below 15 volts AC rms to minimize potential dangers of excessive current flow through the human body.

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