- "AI" here means the National Board Authorized Inspector Commission, issued through the National Board of Boiler and Pressure Vessel Inspectors.
- The detailed content outline (NB-331-NC Revision 6) has 12 numbered headings, and no percentage weights are published.
- The issuer confirms an 85-question examination plus attendance at the AI Commission course with a passing examination.
- Required references include ASME Sections I, IV, V, VIII Division 1, IX, B31.1, QAI-1 and RCI-1/NB-263.
What "AI" Means Here
On this site, AI is shorthand for the National Board Authorized Inspector Commission. It is a credential in the boiler and pressure vessel world, and it has nothing to do with artificial intelligence or with any other certification that happens to share the same two letters. In this context an "Authorized Inspector" is a person commissioned to verify that boilers, pressure vessels and related pressure-retaining items are designed, built, tested and documented in accordance with the applicable ASME Boiler and Pressure Vessel Code (BPVC) rules.
If you have arrived here from a search for the meaning of "AI," this article is deliberately narrow: it explains what the Commission is, what the examination covers, and how the role works in practice. For related phrasing of the same question, you can also read What Is AI?, What Does AI Stand For? and What Does AI Mean?, which approach the term from slightly different angles.
Who Governs the Commission
The credential is governed by The National Board of Boiler and Pressure Vessel Inspectors. The National Board publishes the detailed content outline for the AI examination (document NB-331-NC, Revision 6) and describes examination information on its own website. Two points from the issuer's published information shape everything else about the credential:
- The examination consists of 85 questions.
- Candidates must attend the AI Commission course and pass an examination as part of that process.
That second point matters. This is not a self-paced, sit-anywhere credential where you simply buy a test voucher. The course attendance is part of the pathway, which is why questions about eligibility and prerequisites deserve their own treatment; see AI Requirements 2026: Eligibility, Prerequisites & How to Qualify for that discussion.
What an Authorized Inspector Actually Does
The Commission exists because pressure equipment is dangerous when built badly, and jurisdictions and owners need an independent party to verify compliance. The first domain in the outline, Responsibilities and Duties of the AI, frames this through two documents: RCI-1 and ASME QAI-1. Together they define the roles of authorized inspection agencies, supervisors and inspectors, and the duties that flow from those roles. Duties also appear throughout the other required references, not just in one chapter.
In day-to-day terms, an inspector working in this space is expected to be able to do the following:
- Recognize the type of boiler or vessel in front of them and name its parts correctly.
- Find the right rule in the right section of the Code, and understand how requirements in different sections relate to one another.
- Evaluate a manufacturer's quality control system against the relevant appendix requirements.
- Check design, material and fabrication decisions against Code rules.
- Witness or review nondestructive examination, heat treatment and pressure tests.
- Confirm that calibration, data reports, stamping and record retention are handled correctly.
Employers that need this verification function, including authorized inspection agencies and organizations responsible for pressure equipment, are the natural audience for the credential. For a closer look at the employment side, see AI Jobs, and for earnings context see the AI Salary Guide 2026: Complete Earnings Analysis.
What We Know About the Exam Format
The examination has 85 questions, and the content outline groups the material into twelve numbered headings. The outline also includes an introductory summary that groups content into eleven objectives. That summary organizes the material differently, and it does not replace the detailed twelve-heading hierarchy. When you build a study plan, use the detailed hierarchy, because it is the more granular map of what you can be asked.
No percentage weights are published for the domains. That has a practical consequence: you cannot responsibly skip a domain on the theory that it is "only a small slice." A candidate who prepares unevenly is gambling. Because the outline tells you what topics exist but not how heavily each is sampled, broad competence is the safer strategy.
If you are weighing how demanding the exam is, How Hard Is the AI Exam? Complete Difficulty Guide 2026 goes deeper, and AI Passing Score 2026: Exactly What You Need to Pass covers what is and is not known about the scoring threshold.
The Twelve Content Domains
The domains below follow the detailed outline. Each is described with the specific topics the outline names. For a longer walk-through of every area, see AI Exam Domains 2026: Complete Guide to All 12 Content Areas.
Domain 1: Responsibilities and Duties of the AI
The foundation of the whole role. This domain centers on RCI-1 and ASME QAI-1.
- Roles of authorized inspection agencies, supervisors and inspectors
- Duties that appear throughout the required reference documents, not only in the dedicated chapters
Domain 2: Boiler and Pressure Vessel Types and Terminology
You cannot apply a rule to equipment you cannot identify.
- Identifying types of boilers and pressure vessels
- Naming their parts correctly
Domain 3: Code Structure and Content
Navigation skill is tested as seriously as recall.
- How the ASME BPVC is organized
- The content of the relevant sections and the related requirements that connect them
Domain 4: Quality Control System
Quality control requirements are located in specific appendices.
- Section I, Appendix A-301
- Section IV, Appendix F
- Section VIII Division 1, Appendix 10
Domain 5: Design
One of the broadest domains by topic count in the outline.
- Power boilers, heating boilers, external piping and vessels
- Shells and drums; piping, headers and nozzles
- Formed and flat heads; braced and stayed surfaces
- Weld sizes and nozzle reinforcement
- Preformed and prefabricated pressure parts
- Flanges, joint efficiencies and ligament efficiency
Domain 6: Materials
Material rules live in the construction sections, and the details matter.
- Construction-section material rules and product-form tolerances
- Markings and marking methods
- Pressure and nonpressure parts
- Non-ASME standards
- Repair of defective material and material certifications
Domain 7: Fabrication
Fabrication covers both forming and welding, and the outline is detailed on both.
- Cutting and edge preparation; cold-forming limits
- Out-of-roundness limits for cylindrical, conical and spherical shells
- Formed-head tolerances; lug and fitting attachment
- Holes for screwed or threaded stays and tubes
- Welding responsibilities and processes; procedure, welder and operator qualifications
- Surface cleaning, alignment tolerances, spin holes and finished joints
- Fillet welds, defect repair, peening and surface weld-metal buildup
Domain 8: Nondestructive Examination
Knowing when a method is required and which methods are permitted.
- When NDE is required and which methods are permitted
- Advantages and limitations of each method
- Procedure and personnel qualification, and reports
Domain 9: Testing and Heat Treatment
Includes the exceptions as well as the rules.
- Impact testing, heat treatment and pressure tests
- Exemptions and alternatives
Domain 10: Calibration of Measurement and Test Equipment (M&TE)
Measurement is only trustworthy if the instruments are controlled.
- Calibration frequencies, methods and tolerances
- Master standards, identification and records
- Both working and master measurement and test equipment
Domain 11: Data Reports and Stamping
The paperwork and marks that certify completion.
- Data reports and stamping as they apply to the type of construction involved
Domain 12: Record Retention
What must be kept, and under which section.
- Record retention requirements under ASME Sections I, IV and VIII
Key Takeaway
The Design and Fabrication domains carry the longest topic lists in the outline, but because no weights are published, treat the short domains (such as Calibration and Record Retention) as fully testable rather than as afterthoughts.
The Required Reference Library
The outline names a specific set of documents candidates must know. This is the part of the credential that most separates it from generic exam preparation: you are studying actual engineering and inspection standards, not a vendor's body of knowledge.
| Reference | Where It Shows Up in the Outline |
|---|---|
| ASME Section I | Power boiler design and construction; quality control (Appendix A-301); record retention |
| ASME Section IV | Heating boiler requirements; quality control (Appendix F); record retention |
| ASME Section V | Nondestructive examination methods and qualification |
| ASME Section VIII Division 1 | Pressure vessel rules; quality control (Appendix 10); record retention |
| ASME Section IX | Welding procedure and welder/operator qualification |
| ASME B31.1 | Power piping, relevant to external piping |
| QAI-1 | Qualifications and duties for authorized inspection agencies and inspectors |
| RCI-1 / NB-263 | Rules for commissioned inspectors and their organizations |
The table above is a practical map, not a substitute for the outline. Your working method should be to read each domain heading in the NB-331-NC outline, note which of these documents it points to, and then become fluent in locating the relevant paragraphs quickly. Code-navigation fluency, not memorization of isolated numbers, is usually what separates prepared candidates from unprepared ones.
Why the Acronym Causes Confusion
"AI" is an extremely crowded acronym. Searching for it will surface artificial intelligence content, plus other credentials that abbreviate to the same letters. Those are entirely separate programs with their own issuers, requirements and exams. None of their details apply here. When you evaluate any claim about fees, dates, pass rates or salaries, check that it is about the National Board Authorized Inspector Commission and not another credential that shares the abbreviation.
That caution applies to this very site's neighbors as well. Pages such as What Is AI Certification? and AI Certification explain the credential from the certification angle, while the AI Certification Cost 2026: Complete Pricing Breakdown page is where cost questions belong. For pass-rate questions, AI Pass Rate 2026: What the Data Shows explains what can and cannot be said responsibly.
Sequencing Your Preparation by Domain
General study technique is not the point of this article, but one short, AI-specific sequencing idea is worth stating. Because the later domains (NDE, testing, calibration, data reports, record retention) assume fluency with the earlier ones, build in an order that mirrors how a vessel moves from role definition to design to fabrication to certification. A sensible arrangement:
Orientation: Domains 1-3
- Learn the roles under RCI-1 and QAI-1
- Learn equipment types and terminology
- Practice locating content across the ASME sections
Technical core: Domains 4-7
- Quality control appendices (A-301, F, 10)
- Design calculations and concepts: reinforcement, joint and ligament efficiency
- Materials and fabrication limits, including welding qualification under Section IX
Verification and closure: Domains 8-12
- NDE methods and limitations (Section V)
- Impact testing, heat treatment and pressure tests with exemptions
- Calibration, data reports, stamping and record retention
Spend your heaviest effort in Block 2, where the topic lists are longest, then use timed question practice from the AI practice test site to find weak spots. For a broader plan, the AI Study Guide 2026: How to Pass on Your First Attempt lays out a full approach, and the AI Cheat Sheet 2026: One-Page Review of Must-Know Facts is useful for a final review pass.
Frequently Asked Questions
It means the National Board Authorized Inspector Commission, a credential tied to The National Board of Boiler and Pressure Vessel Inspectors. It concerns the inspection of boilers and pressure vessels against ASME Code requirements, not artificial intelligence.
The issuer's examination information confirms 85 questions, along with attendance at the AI Commission course and a passing examination. The exact timer and numerical pass mark are not verified here, so confirm them with the National Board.
No. The NB-331-NC Revision 6 outline lists twelve numbered headings in detail but does not publish percentage weights, so broad preparation across all twelve domains is the safest approach.
The required references are ASME Sections I, IV, V, VIII Division 1 and IX, ASME B31.1, QAI-1, and RCI-1/NB-263. Each domain in the outline points to specific parts of these documents.
That depends on your career path in pressure equipment inspection and on the employers you are targeting. For a structured look at the trade-offs, see Is the AI Certification Worth It? Complete ROI Analysis 2026, and check AI Exam Dates 2026: Testing Windows, Deadlines & Scheduling when you are ready to plan timing.