API 570 Piping Inspector Practice Test

What is the maximum external inspection interval for Class 3 piping?

8 years 12 years 15 years 10 years

Correct Answer:

10 years

Explanation:

The main idea here is how often you should schedule external inspections based on the pipe class. API 570 uses a risk-based framework that assigns longer intervals to lower-risk classes. For Class 3 piping, the upper limit for external inspections is 10 years. This reflects that Class 3 piping is considered less critical than Class 1 or 2, so the external inspection interval can be longer, provided there are no other factors driving a shorter schedule (like prior corrosion, coating damage, harsh service, or elevated corrosion rates). In practice, if everything is in normal condition, you would not exceed a 10-year external inspection interval for Class 3. If any adverse conditions are present, the interval should be shortened accordingly.

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