API 570 Practice Questions - API 570 Piping Inspector Exam

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Two CMLs in the same circuit have corrosion rates of 0.004 in./yr and 0.012 in./yr. Which rate should drive the next thickness-inspection schedule for that circuit?

The lower rate, because it represents average circuit behavior The higher rate, because it is the controlling deterioration rate The arithmetic mean of both rates Neither rate; only the nominal pipe thickness matters

Correct Answer:

The higher rate, because it is the controlling deterioration rate

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