NBBI Inservice Inspector (IS) Practice Questions - NBBI Inservice Inspector (IS) Commission Exam

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During an internal inspection of a firetube boiler, you observe thinning of the tube sheets around the tube holes. What is the most likely cause?

Corrosion caused by boiler water chemistry issues or galvanic action Normal wear from steam flow Impact damage from tube cleaning equipment Paint peeling from the surface

Correct Answer:

Corrosion caused by boiler water chemistry issues or galvanic action

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