Exam Name: Pressure Vessel Inspector
Certification Provider: API
Corresponding Certification: Individual Certification Programs
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Check Updated on: Oct 14, 2026
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- Total Questions: 175
- Updated on: Oct 14, 2026
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- Total Questions: 175
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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 |
| Certificate Validity Period: | 3 years |
| Related Certifications: | API 571 Damage Mechanisms API 570 Piping Inspector API 576 Pressure Relieving Devices API 653 Storage Tank Inspector |
| Passing Score: | 550 (scaled score, range 200–750) |
| Available Languages: | English |
| Exam Duration: | 450 (total exam day: 7.5 hours; 165 min closed-book + 225 min open-book + 45 min break) |
| Exam Format: | Multiple-choice questions, Two-part: closed-book (no references) + open-book (on-screen code access only), Computer-based test |
| Real Exam Qty: | 170 (140 scored + 30 unscored pretest; 110 closed-book + 60 open-book) |
| Exam Price: | $875 (API member) / $1,125 (non-member) USD |
| Recommended Training: | API Official Training Resources API 510 Body of Knowledge |
| Exam Registration: | API Certification Portal Prometric Scheduling |
| Sample Questions: | DOWNLOAD DEMO |
| 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 |
|---|---|---|
| Topic 1: Inspection Scope, Planning, and Data Evaluation | 28% | - Remaining life and corrosion rate calculations - Code scope, jurisdiction, and regulatory requirements - Inspection methods and technique selection - TML/CML selection and measurement planning - Records review and baseline data collection - Inspection interval determination and extension rules |
| Topic 2: Repairs, Alterations, Rerating, and Mechanical Integrity | 16% | - Authorization and responsibility for work - Rerating, reclassification, and nameplate updates - Pressure relieving devices and overpressure protection - Documentation and post-work verification - Repair vs alteration definitions and procedures |
| Topic 3: Fitness-for-Service, RBI, and Pressure Testing | 12% | - Risk-based inspection (RBI) principles and application - Acceptance criteria and post-test evaluation - Hydrostatic, pneumatic, and leak testing rules - API 579/ASME FFS-1 screening and assessment |
| Topic 4: Damage Mechanisms and Corrosion Assessment | 22% | - High-temperature damage and material degradation - Corrosion under insulation (CUI) and environmental degradation - Damage assessment and prioritization - Internal, external, and localized corrosion - Cracking mechanisms (environmental, fatigue, creep) |
| Topic 5: Design, Materials, and Fabrication Rules | 22% | - Flanges, bolting, gaskets, and special components - Material selection, properties, and toughness requirements - MAWP, thickness, and joint efficiency calculations - ASME Section VIII, V, IX application - Positive material identification (PMI) and traceability - Welding, qualification, and PWHT requirements |
API-510 Material FAQ
The API Pressure Vessel Inspector exam requires a score of 550 (scaled score, range 200–750) to pass, and the official registration fee is $875 (API member) / $1,125 (non-member) USD. Because the fee is significant, preparing thoroughly the first time is the practical choice.
Every session in the test engine is scored and broken down, so you see clearly which topics you handle well and which ones keep costing you points. That picture tells you where your remaining study time belongs — a far better guide than rereading everything evenly.
The API Pressure Vessel Inspector exam contains 170 (140 scored + 30 unscored pretest; 110 closed-book + 60 open-book) questions, and you will have 450 (total exam day: 7.5 hours; 165 min closed-book + 225 min open-book + 45 min break) minutes to complete them. Practicing within the same limits builds the pacing the real exam demands.
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
You can confirm the current eligibility requirements on the official API-510 exam page before you register.
This package includes 175 practice questions for the API Pressure Vessel Inspector exam. Every answer is verified by an experienced team of experts, so you can trust what you study.
You can register for the API Pressure Vessel Inspector exam through the official channels:
Yes. Once downloaded, the online test engine keeps running without an internet connection, on Windows, Mac, Android, or iOS. That means practice continues on flights, in waiting rooms, and anywhere else your day takes you — your API-510 preparation never has to pause for a missing signal.
The API Pressure Vessel Inspector practice questions are organized around the official exam objectives. Key topics include:
- Inspection Scope, Planning, and Data Evaluation (28%)
- Repairs, Alterations, Rerating, and Mechanical Integrity (16%)
- Design, Materials, and Fabrication Rules (22%)
Comparing your practice scores against these topics shows you where the next session should go.
Many candidates combine practice questions with official training. Recommended options include:
API Pressure Vessel Inspector Sample Questions:
How does API-510 guide the decommissioning process for pressure vessels that are no longer fit for service?
Reveal Solution Discussion 0Correct Answer:
API-510 guides the decommissioning process for pressure vessels by outlining a series of steps designed to ensure safety and compliance with environmental regulations. The process begins with a thorough cleaning to remove any hazardous substances, followed by a comprehensive inspection to document the vessel's condition. The vessel is then isolated and, if necessary, cut into manageable sections for removal, using methods that prevent any contamination or environmental impact. Finally, all associated documentation is updated to reflect the decommissioning, and materials are recycled or disposed of in accordance with local environmental standards.
The API authorized pressure vessel inspector may give prior authorization for repairs that do not involve:
- A. Final visual inspections
- B. Pressure tests
- C. Radiography
- D. Pneumatic testing
Correct Answer: B 🗳️
Which API document should be consulted for the repair of pressure relieving devices as per API-510?
- A. API 579
- B. API 570
- C. API 576
- D. API 572
Correct Answer: C 🗳️
What does API-510 require to verify a welder's qualifications when welding on a pressure vessel?
- A. A written test
- B. Performance qualification records
- C. Inspection of previous work
- D. A practical demonstration
Correct Answer: B 🗳️
If local post-weld heat treatment is to be substituted for 360 degree banding, who is required to develop the procedure?
- A. The repair organization
- B. A pressure vessel engineer experienced in the appropriate engineering specialties
- C. The owner user
- D. The authorized pressure vessel inspector
Correct Answer: B 🗳️
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