The free 10-question API 510 check

API 510 · Question 1 of 10Untimed

10 questions, untimed, about 23 minutes. Your score by domain at the end.

IV. Practical knowledge - general

Which hydrotest situation carries the highest brittle fracture risk?

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A thin-walled austenitic stainless vessel tested at 70 FA thick carbon steel vessel tested with water kept well above its MDMT at all timesA thin carbon steel vessel tested at 120 FA thick-walled older carbon steel vessel tested with cold water on a winter day

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Every question is original and written to American Petroleum Institute's published content outline, and every explanation cites the code section or source it relies on. Expert-reviewed: every question was checked by a pressure vessel inspection professional with 13 years in the industry (Oct 20, 2026).