AMPP CP3 Technologist Practice Questions - AMPP CP3 Cathodic Protection Technologist Exam

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For designing CP for a 10 km new bare steel pipeline in 3,000 ohm-cm soil, what is a reasonable first-pass current requirement estimate, assuming ~10 mA/m² for bare steel?

Approximately 100 mA total Approximately 50 A total (assuming ~5000 m² surface area for a 12-in pipe) Approximately 5 A total Approximately 5,000 A total

Correct Answer:

Approximately 50 A total (assuming ~5000 m² surface area for a 12-in pipe)

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