API 510 Pressure Vessel InspectorExam Guide & Preparation
API 510 Pressure Vessel Inspector certifies your competency to inspect, repair, alter, and rerate in-service pressure vessels in accordance with API 510 and ASME Boiler and Pressure Vessel Code, Section VIII.
API 510 Pressure Vessel Inspector certifies your competency to inspect, repair, alter, and rerate in-service pressure vessels in accordance with API 510 and ASME Boiler and Pressure Vessel Code, Section VIII.
It's the most widely held API inspector credential, and for many refinery and petrochemical inspectors it's the first certification pursued before adding API 570, API 653, or API 571 later in their career.
The exam runs 170 questions across a 7.5-hour exam day: 110 closed-book questions testing recall without reference material, then 60 open-book questions with on-screen PDF access to specific code sections. Only 140 of the 170 questions count toward your score, the remaining 30 are unscored pretest items mixed in to validate future exam content.
Whether you're looking for a structured API 510 course, self-paced API 510 online training, or simply a focused way to study for API 510 certification around a working schedule, EIM's API 510 training platform is built to fit all three.
API 510 vs API 570, 653, and 571
API 510, 570, and 653 are equipment-specific: each tests code compliance, repair procedures, and inspection intervals for a particular asset type, pressure vessels, piping, and storage tanks respectively. None of the three has an automatic-qualify path into the others, since API treats them as independently maintained credentials requiring equipment-matched experience.
API 571 sits underneath all three as a mechanism-focused certification: instead of asking how to inspect a specific equipment type, it asks why any of that equipment degrades in the first place. Holding API 510 automatically qualifies you to sit for API 571, which is why many pressure vessel inspectors treat it as the natural next certification after 510.
Qualification & Prerequisites
Body of Knowledge Breakdown
Five domains, weighted by question share. This is the map the question bank is built directly against.
Vessel design basis, material specifications, wall thickness and joint efficiency calculations
Corrosion rate calculation, remaining life estimation, internal/external/on-stream inspection timing
Repair vs. alteration distinction, engineering sign-off requirements, rerating basis
Applied field inspection techniques underneath API 510's formal requirements
Recognizing corrosion and damage mechanisms as they apply to pressure vessel inspection findings
| Domain | Covers | |
|---|---|---|
| 01 | ASME Section VIII Construction Fundamentals | Vessel design basis, material specifications, wall thickness and joint efficiency calculations |
| 02 | API 510 In-Service Inspection Intervals | Corrosion rate calculation, remaining life estimation, internal/external/on-stream inspection timing |
| 03 | Repair, Alteration, and Rerating Procedures | Repair vs. alteration distinction, engineering sign-off requirements, rerating basis |
| 04 | API 572 Inspection Practices | Applied field inspection techniques underneath API 510's formal requirements |
| 05 | API 571 Damage Mechanisms (Applied) | Recognizing corrosion and damage mechanisms as they apply to pressure vessel inspection findings |
01. ASME Section VIII Construction Fundamentals
02. API 510 In-Service Inspection Intervals
03. Repair, Alteration, and Rerating Procedures
04. API 572 Inspection Practices
05. API 571 Damage Mechanisms (Applied)
How to Register and What to Expect on Exam Day
Candidates apply directly through API's Individual Certification Programs (ICP) portal, not through EIM or any third-party training provider. Exams are administered at Prometric testing centers worldwide during specified testing windows throughout the year.
API's 2026 fee schedule lists the official API 510 exam fee at $875 for API members and $1,125 for nonmembers. This official fee covers only your Prometric exam seat; it does not include study material, a question bank, or structured exam preparation.
How to Prepare for API 510 Pressure Vessel Inspector
Self-paced by default. Add live instruction if you want structured guidance.
API 510 Pressure Vessel Inspector Question Bank
1050 practice questions across 1 module, mapped to every BOK domain. Study at your own pace, no fixed schedule required.
Sample Practice Questions
A pressure vessel has shown a corrosion rate of 0.012 in/yr on its most recent internal inspection, with 0.180 inches of remaining corrosion allowance. Per API 510, what is the maximum allowable interval before the next internal inspection is required?
What's Included in the Self-Prep Package
API 510 Question Bank
Scenario-based questions mapped to the current API 510 Body of Knowledge, with a worked explanation for every answer.
API 510 Study Notes
Downloadable study material covering ASME Section VIII, API 510 inspection intervals, and repair and alteration procedures.
API 510 Mock Test
Full-length practice exam mirroring the real closed-book and open-book split under timed conditions.
Related Certifications
Common Questions
What is the API 510 certification?
How many questions are on the API 510 exam?
How long is the API 510 exam?
How much does API 510 certification cost?
Am I eligible for API 510 without a pressure vessel inspection background?
What does EIM's API 510 training include?
Is API 510 recognized as an inspector certification internationally?
How is API 510 different from API 571?
Why API 510 Pressure Vessel Inspector Matters for Asset Integrity Careers
A common misconception is that the open-book portion of the API 510 exam is the easier half. In practice, candidates who haven't internalized where specific provisions live within ASME Section VIII and API 510 itself lose significant time simply navigating the reference material under a 3.75-hour clock, roughly 84 seconds per question if spent evenly. Effective API 510 exam preparation means practicing with the actual reference documents open, not just reading them once.
EIM's API 510 question bank and study notes are built around this reality: every practice question is timed and scenario-based, so your API 510 mock test practice trains the specific skill the real exam demands, fast, accurate reference navigation, not just passive recall.
- ✓1050 practice questions
- ✓1 structured module
- ✓1 Year
- ✓Mobile-friendly platform
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