Exam Name: Pressure Vessel Inspector
Certification Provider: API
Corresponding Certification: Individual Certification Programs
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Check Updated on: Oct 19, 2026
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API API-510 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Repairs, Alterations, Rerating, and Mechanical Integrity | 16% | - Repair vs alteration definitions and procedures - Documentation and post-work verification - Rerating, reclassification, and nameplate updates - Authorization and responsibility for work - Pressure relieving devices and overpressure protection |
| Topic 2: Damage Mechanisms and Corrosion Assessment | 22% | - Corrosion under insulation (CUI) and environmental degradation - Damage assessment and prioritization - Internal, external, and localized corrosion - High-temperature damage and material degradation - Cracking mechanisms (environmental, fatigue, creep) |
| Topic 3: Design, Materials, and Fabrication Rules | 22% | - Flanges, bolting, gaskets, and special components - Positive material identification (PMI) and traceability - Material selection, properties, and toughness requirements - Welding, qualification, and PWHT requirements - ASME Section VIII, V, IX application - MAWP, thickness, and joint efficiency calculations |
| Topic 4: Inspection Scope, Planning, and Data Evaluation | 28% | - Inspection interval determination and extension rules - Inspection methods and technique selection - Records review and baseline data collection - Remaining life and corrosion rate calculations - Code scope, jurisdiction, and regulatory requirements - TML/CML selection and measurement planning |
| Topic 5: Fitness-for-Service, RBI, and Pressure Testing | 12% | - Risk-based inspection (RBI) principles and application - API 579/ASME FFS-1 screening and assessment - Hydrostatic, pneumatic, and leak testing rules - Acceptance criteria and post-test evaluation |
API Pressure Vessel Inspector Sample Questions:
Aboveground vessels shall be inspected, preferably while in operation, at least every ___________ years or at the same interval as the required internal/on-stream inspection
- A. 10 years
- B. 20 years
- C. 5 years
- D. 15 years
Correct Answer: C 🗳️
Determine in what two ways may the probable corrosion rate for a new vessel be determined before the first internal inspection?
- A. Employing highly experienced inspectors or engineers
- B. Assuming a standard corrosion rate
- C. From data collected on vessels providing the same or similar service or from published data on vessels providing comparable service
- D. Corrosion tabs and UT readings
Correct Answer: C 🗳️
When performing an external inspection on a vessel what consideration should be given to the external insulation?
- A. You may not use any plug locations used for UT thickness reading to inspect the vessel
- B. It shall always be removed to inspect underneath
- C. Select portions must be removed for inspections
- D. If insulation is in good condition and the vessel operates within the high and low temperatures stated in API 510, removal of insulation is not necessary for inspection of the vessel
Correct Answer: D 🗳️
The definition of a construction code is?
- A. Any standard used to build a vessel
- B. Any technique of construction
- C. The Code or standard to which a vessel was originally built
- D. Any standard used to repair vessel
Correct Answer: C 🗳️
Describe the considerations and procedures for pressure testing insulated pressure vessels under API-510.
Reveal Solution Discussion 0Correct Answer:
Pressure testing insulated pressure vessels under API-510 involves several considerations to ensure that the insulation does not conceal leaks or damage. Before testing, inspectors typically require that sections of insulation be removed to expose the vessel surface, particularly in areas prone to corrosion or wear. The testing itself, whether hydrostatic or pneumatic, must be conducted at pressures specified by API-510 to simulate operational conditions accurately. After testing, the insulation must be carefully replaced and inspected to ensure that it maintains its protective properties. Documentation of the entire process is crucial for future inspections and maintenance records.
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