API 510 Study Guide 2026
Everything you need to pass the API 510 exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 API 510 Exam Format at a Glance
📚 API 510 Topics to Study (71)
✍️ Sample API 510 Questions & Answers
1. API 510 requires that alteration work on a pressure vessel be performed using which edition of the construction code?
Alterations may be performed to the original code of construction or the latest applicable edition, per owner/operator and inspector agreement.
2. A API 510 professional discovers a conflict of interest in a current assignment. What is the MOST ethical course of action?
Ethical standards require immediate disclosure of conflicts of interest. Transparency protects both the professional's integrity and the stakeholders' interests. Recusal may be necessary to maintain objectivity.
3. Under API 510, what is the documentation requirement when the inspection interval for a vessel is set using a risk-based approach instead of the traditional formula?
API 510 requires that the full RBI study supporting an alternative interval be documented, reviewed by a qualified engineer, and kept in the vessel's inspection file.
4. What is the primary purpose of a fitness-for-service (FFS) assessment in the context of API 510 repair decisions?
FFS assessments per API 579 evaluate whether a vessel with identified flaws can continue safe operation, potentially avoiding costly immediate repairs.
5. In API 510, when evaluating a vessel with general corrosion, the inspector should compare the measured thickness to:
API 510 requires comparing actual measured thickness to the minimum thickness calculated from the MAWP using the applicable code formula, not the original design thickness.
6. A steel pressure vessel shell has corroded to a thickness below the minimum required. The owner plans to restore it by welding a full encirclement sleeve. This is considered a:
A properly designed and installed full encirclement sleeve welded per applicable code can be a permanent repair restoring pressure-containing integrity.