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Updated: Sep 15, 2026
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API API-510 Exam Overview:
| Certification Vendor: | American Petroleum Institute (API) |
|---|---|
| Exam Name: | API 510 Pressure Vessel Inspector Certification Exam |
| Exam Number: | API-510 |
| Real Exam Qty: | 170 (140 scored + 30 unscored pretest; 110 closed-book + 60 open-book) |
| Certificate Validity Period: | 3 years |
| Available Languages: | English |
| Exam Price: | $875 (API member) / $1,125 (non-member) USD |
| Passing Score: | 550 (scaled score, range 200–750) |
| Related Certifications: | API 570 Piping Inspector API 576 Pressure Relieving Devices API 653 Storage Tank Inspector API 571 Damage Mechanisms |
| Exam Duration: | 450 (total exam day: 7.5 hours; 165 min closed-book + 225 min open-book + 45 min break) |
| Exam Format: | Two-part: closed-book (no references) + open-book (on-screen code access only), Computer-based test, Multiple-choice questions |
| Recommended Training: | API Official Training Resources API 510 Body of Knowledge |
| Exam Registration: | API Certification Portal Prometric Scheduling |
| Sample Questions: | API API-510 Sample Questions |
| Exam Way: | In-person computer-based test at Prometric authorized centers worldwide; no remote testing available |
| Pre Condition: | Education + experience: BS/Eng Tech: 1 year; 2-yr degree: 2 years; High school: 3 years; No degree: 5 years. All require minimum 1 year performing/supervising pressure vessel inspection work within last 10 years |
| Official Syllabus URL: | https://www.api.org/certification/icp/programs/510 |
API API-510 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Damage Mechanisms and Corrosion Assessment | 22% | - High-temperature damage and material degradation - Corrosion under insulation (CUI) and environmental degradation - Cracking mechanisms (environmental, fatigue, creep) - Internal, external, and localized corrosion - Damage assessment and prioritization |
| Fitness-for-Service, RBI, and Pressure Testing | 12% | - API 579/ASME FFS-1 screening and assessment - Acceptance criteria and post-test evaluation - Risk-based inspection (RBI) principles and application - Hydrostatic, pneumatic, and leak testing rules |
| Inspection Scope, Planning, and Data Evaluation | 28% | - Code scope, jurisdiction, and regulatory requirements - Remaining life and corrosion rate calculations - Inspection interval determination and extension rules - Inspection methods and technique selection - TML/CML selection and measurement planning - Records review and baseline data collection |
| Design, Materials, and Fabrication Rules | 22% | - Material selection, properties, and toughness requirements - Flanges, bolting, gaskets, and special components - ASME Section VIII, V, IX application - MAWP, thickness, and joint efficiency calculations - Welding, qualification, and PWHT requirements - Positive material identification (PMI) and traceability |
| Repairs, Alterations, Rerating, and Mechanical Integrity | 16% | - Pressure relieving devices and overpressure protection - Rerating, reclassification, and nameplate updates - Authorization and responsibility for work - Documentation and post-work verification - Repair vs alteration definitions and procedures |
API Pressure Vessel Inspector Sample Questions:
At the discretion of ________, on-stream inspection may be substituted for internal inspection.
- A. The authorized pressure vessel inspector
- B. An engineer experienced in corrosion
- C. An engineer experienced in pressure vessel design
- D. The owner-user of the pressure vessel
Correct Answer: A 🗳️
Which type of discontinuity can liquid penetrant inspection find?
- A. Cracks open to the surface
- B. Laminations on the surfaces of plate
- C. Internal cracking of welds
- D. Subsurface porosity
Correct Answer: A 🗳️
After a new vessel has been installed, what must be done in order accept the vessel for operation?
- A. A first internal inspection.
- B. Base line thickness readings must be taken per API 572
- C. Base line thickness reading must be taken per NBIC regulation 6
- D. A first internal inspection, however if a manufactures' data report (U1) assuring that the vessel is satisfactory for its intended service is available the first internal may be waived
Correct Answer: D 🗳️
Explain how API-510 facilitates the upgrade of older pressure vessels to meet modern safety and efficiency standards.
Reveal Solution Discussion 0Correct Answer:
API-510 facilitates the upgrade of older pressure vessels to meet modern safety and efficiency standards by providing guidelines for assessing their current condition and determining the feasibility of various upgrade options. This includes evaluating the compatibility of new materials and technologies with the existing vessel structure and determining the necessary modifications to enhance performance and safety. API-510 also outlines the required inspections and tests to certify that upgraded vessels comply with current standards, ensuring that they can continue to operate safely and efficiently.
Test or inspection intervals on pressure-relieving devices in typical process service should not exceed which of the following?
- A. Interval should not exceed 2.5 years
- B. Interval should not exceed 5 years
- C. Interval should not exceed 7.5 years
- D. Interval should not exceed 10 years
Correct Answer: B 🗳️
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