- What "AI Training" Actually Means for the Commission
- The Commission Course and the 85-Question Exam
- How the NB-331-NC Outline Is Organized
- Core Training Content by Domain
- Fabrication, Welding and NDE: Where Details Pile Up
- Testing, Calibration, Reports and Records
- Building Your Reference Library
- Sequencing Your Preparation Around the Domains
- Who Hires Commissioned Inspectors
- Frequently Asked Questions
- The National Board of Boiler and Pressure Vessel Inspectors governs the Authorized Inspector Commission; training centers on its AI Commission course.
- Examination information from the issuer confirms 85 questions and a passing examination alongside attendance at the Commission course.
- The NB-331-NC outline has 12 numbered headings, and no percentage weights are published for any of them.
- Required references span ASME Sections I, IV, V, VIII Division 1, IX, B31.1, QAI-1 and RCI-1/NB-263.
What "AI Training" Actually Means for the Commission
Search results for "AI training" are crowded with machine-learning courses. This article is about something different: preparing for the National Board Authorized Inspector Commission (AI), the credential issued through The National Board of Boiler and Pressure Vessel Inspectors for inspectors who verify that boilers and pressure vessels are built in accordance with ASME Boiler and Pressure Vessel Code requirements. If you want the basics of the credential first, start with What Is AI Certification? or What Does AI Stand For?
Training for this commission is not a single event. It combines three layers: formal attendance at the AI Commission course, independent study of the ASME Code sections the exam draws on, and practice applying Code rules to realistic construction scenarios. The sections below break down each layer using the National Board's own detailed outline, document NB-331-NC Revision 6.
The Commission Course and the 85-Question Exam
The issuer's examination information confirms two structural points that shape all preparation: the examination contains 85 questions, and candidates are expected to attend the AI Commission course and pass the examination. Those are the facts that can be stated with confidence.
Because the course and the exam are linked, your training plan should treat the course as the spine of your preparation, not as a substitute for it. The course introduces the structure and logic of the Code and the inspector's role; your independent work is where you build the speed to find and apply specific paragraphs. Eligibility questions, such as experience and employer requirements, are covered separately in AI Requirements 2026.
How the NB-331-NC Outline Is Organized
The detailed outline lists 12 numbered headings. There is also an introductory summary of 11 objectives, but it groups content differently and does not replace the detailed hierarchy. When you plan training, use the 12-heading outline as your checklist, because that is the structure the detailed content follows.
Two characteristics of this outline matter for how you train:
- No percentage weights are published. You cannot safely skip a domain because it "looks small." Any heading can appear, so coverage matters more than guessing at emphasis.
- The outline is a topic hierarchy, not a question list. Many headings contain long lists of subtopics, such as the fabrication heading covering everything from cutting and edge preparation to peening and surface weld-metal buildup.
For a domain-by-domain walkthrough of the content areas, see AI Exam Domains 2026: Complete Guide to All 12 Content Areas. The next sections focus on what training looks like inside each cluster.
Core Training Content by Domain
Foundations: Duties, Terminology and Code Navigation
Domain 1: Responsibilities and Duties of the AI
This domain covers the roles of authorized inspection agencies, supervisors and inspectors under RCI-1 and ASME QAI-1, plus the duties that appear throughout the required references.
- Know which responsibilities belong to the manufacturer and which belong to the inspector
- Learn how QAI-1 and RCI-1 divide the roles of the agency, supervisor and inspector
- Expect duties to surface inside questions on other domains, not only in this one
Domain 2: Boiler and Pressure Vessel Types and Terminology
Before applying any rule, you must identify what you are looking at: the type of boiler or vessel and the names of its parts.
- Distinguish power boilers, heating boilers and pressure vessels, since different Code sections govern them
- Memorize part names precisely; Code language depends on exact terminology
Domain 3: Code Structure and Content
This is about navigating the ASME BPVC and its related requirements efficiently.
- Know which Section governs which type of construction
- Practice locating paragraphs quickly; familiarity with the table of contents and appendices is a skill you train, not something you pick up passively
Quality Control, Design and Materials
Domain 4: Quality Control System
The outline points to three specific locations: Section I Appendix A-301, Section IV Appendix F and Section VIII Division 1 Appendix 10.
- Compare how each appendix frames the manufacturer's quality control system
- Learn what an inspector looks for when reviewing a manufacturer's quality program
Domain 5: Design
This is among the broadest headings. It spans power and heating boilers, external piping and vessels, and a long list of components and calculations.
- Shells and drums, piping, headers and nozzles
- Formed and flat heads, and braced and stayed surfaces
- Weld sizes, nozzle reinforcement and preformed or prefabricated pressure parts
- Flanges, joint efficiencies and ligament efficiency
Domain 6: Materials
Material rules are tested through the lens of what the construction section permits.
- Construction-section rules and product-form tolerances
- Markings and marking methods, and pressure versus nonpressure parts
- Non-ASME standards and defective-material repair
- Material certifications
Fabrication, Welding and NDE: Where Details Pile Up
Domains 7 and 8 reward candidates who study at the level of individual Code requirements. Fabrication in particular contains a large number of tolerances and limits that are easy to confuse.
Domain 7: Fabrication
The outline splits this heading into forming work and welding work.
- Forming and preparation: cutting and edge preparation, cold-forming limits, out-of-roundness limits for cylindrical, conical and spherical shells, formed-head tolerances, lug and fitting attachment, and holes for screwed or threaded stays and tubes
- Welding: welding responsibilities and processes, procedure and welder or operator qualifications (Section IX is a required reference), surface cleaning, alignment tolerances, spin holes, finished joints, fillet welds, defect repair, peening and surface weld-metal buildup
Domain 8: Nondestructive Examination
Section V is the required reference here.
- When NDE is required and which methods are permitted
- Advantages and limitations of each method
- Procedure and personnel qualification, and reports
Testing, Calibration, Reports and Records
The last four headings are more procedural, and candidates sometimes under-prepare them because they seem administrative. Because no weights are published, treat them as fully testable.
- Domain 9: Testing and Heat Treatment. Impact testing, heat treatment and pressure tests, including exemptions and alternatives. The exemptions are where questions tend to hide.
- Domain 10: Calibration of Measurement and Test Equipment (M&TE). Calibration frequencies, methods, tolerances, master standards, identification and records for working and master measurement and test equipment.
- Domain 11: Data Reports and Stamping. The reports and stamping requirements depend on the construction type, so learn them per Section rather than as one generic list.
- Domain 12: Record Retention. Retention requirements under ASME Sections I, IV and VIII. Build a side-by-side comparison so the differences stick.
| Outline Heading | Primary Reference Focus | Training Emphasis |
|---|---|---|
| 4. Quality Control System | Section I App. A-301; Section IV App. F; Section VIII Div. 1 App. 10 | Compare the three appendices |
| 7. Fabrication (welding) | Section IX plus construction sections | Qualifications and alignment tolerances |
| 8. Nondestructive Examination | Section V | Method selection and limitations |
| 10. Calibration of M&TE | Quality control provisions | Frequencies, standards and records |
| 12. Record Retention | Sections I, IV, VIII | Side-by-side retention comparison |
Building Your Reference Library
The outline names its required references explicitly, and your training should be built around having working familiarity with every one of them:
- ASME Section I (power boilers)
- ASME Section IV (heating boilers)
- ASME Section V (nondestructive examination)
- ASME Section VIII, Division 1 (pressure vessels)
- ASME Section IX (welding and brazing qualifications)
- ASME B31.1 (power piping)
- ASME QAI-1 (qualifications for authorized inspection)
- RCI-1/NB-263 (rules for commissioned inspectors)
Key Takeaway
Do not study these as eight separate books. Study them as one connected system: a single topic, such as nozzle reinforcement or heat treatment, often touches a construction section, a materials requirement, a welding qualification and a reporting rule. Cross-reference as you go. Our AI Cheat Sheet and AI Study Guide are useful companions once your core reading is done.
Sequencing Your Preparation Around the Domains
Generic study scheduling matters less than domain order. A sensible sequence builds vocabulary and navigation skill first, then layers on the heavy technical headings, then finishes with the procedural ones. This is one possible arrangement, adjusted for your background and your course dates (see AI Exam Dates 2026 for scheduling context):
Orientation and Navigation
- Duties under QAI-1 and RCI-1 (Domain 1)
- Vessel and boiler types and terminology (Domain 2)
- Code structure and paragraph-finding drills (Domain 3)
Design and Materials
- Quality control appendices (Domain 4)
- Design components and calculations (Domain 5)
- Materials rules, markings and certifications (Domain 6)
Fabrication and NDE
- Forming limits and tolerances (Domain 7)
- Welding qualification and joint requirements (Domain 7)
- NDE methods and qualification (Domain 8)
Testing, Reports and Review
- Impact tests, heat treatment, pressure tests (Domain 9)
- Calibration, data reports, stamping, record retention (Domains 10-12)
- Timed practice on the full range; see our AI practice test
The reasoning behind this order: Domains 1 through 3 give you the map. Without them, the design and fabrication details have nowhere to attach. Domains 10 through 12 come last because they are shorter and procedural, but they should not be skipped. Finish with mixed questions so you practice switching between domains, since the real exam will not group questions by heading. You can also work through scenario questions on the main practice test site.
Who Hires Commissioned Inspectors
The Authorized Inspector Commission is tied to the authorized inspection system, so its natural employers are the organizations that operate within it. Inspectors commonly work for authorized inspection agencies, which provide third-party inspection of boilers and pressure vessels during construction. Because the exam content centers on manufacturing and fabrication oversight, the work is closely connected to fabrication shops and manufacturers that build code-stamped equipment.
To think through the career side, read AI Jobs, AI Salary Guide 2026 and Is the AI Certification Worth It? Those articles address earnings and return on investment; this one deliberately avoids quoting numbers that cannot be verified from the issuer's materials.
Frequently Asked Questions
No. Here it refers to preparation for the National Board Authorized Inspector Commission, which concerns inspection of boilers and pressure vessels under the ASME Boiler and Pressure Vessel Code. For the terminology, see AI Meaning.
The issuer's examination information confirms 85 questions. The exact timer, current fee and numerical pass mark are not verified here, so confirm them with the National Board before you register.
No percentage weights are published for the 12 headings in NB-331-NC Revision 6. Plan to cover every heading rather than concentrating on the ones that seem largest.
The required references are ASME Sections I, IV, V, VIII Division 1 and IX, B31.1, QAI-1 and RCI-1/NB-263. Section VIII Division 1 and Section I appear in many outline headings, so they are strong anchors for your study.
No. The course and a passing examination are both part of the path, and the outline's level of detail, such as out-of-roundness limits and record retention rules, rewards candidates who work through the Code themselves. Review the AI Pass Rate discussion for what is and is not known about outcomes.