NDT Training for API CPD Hours: MT, PT, UT, RT, and VT

Nondestructive testing (NDT) is the technical backbone of API inspection work. Whether you are evaluating a pressure vessel, a piping circuit, or a storage tank, your ability to select, apply, and interpret NDT methods directly affects both equipment safety and your professional credibility. It is also one of the most productive areas for earning API CPD hours.

This guide covers the five core NDT methods — MT, PT, UT, RT, and VT — explains how training in each method qualifies for API ICP continuing professional development credit, and points you to the best resources for online NDT training.

Why NDT Training Qualifies for API CPD Hours

The API Individual Certification Program requires 24 CPD hours per 3-year recertification cycle for API 510, API 570, and API 653 inspectors. Acceptable topics are those directly relevant to the scope of the certification — and NDT sits squarely in the middle of that scope.

API 510, API 570, and API 653 all require the inspector to understand:

• Which NDT methods are appropriate for specific damage mechanisms
• The capabilities and limitations of each method
• How to specify NDT in an inspection plan
• How to evaluate and interpret NDT results

Training that deepens your competence in these areas — whether introductory or advanced — qualifies as CPD. Online NDT courses that include a final exam and issue a certificate of completion are fully acceptable for API ICP documentation. For a broader look at what qualifies, see our guide on what counts as CPD hours for API inspectors.

MT: Magnetic Particle Testing

Magnetic particle testing is used to detect surface and near-surface discontinuities in ferromagnetic materials. It is particularly useful for finding cracks at welds and in base metal, including stress corrosion cracking and hydrogen-induced cracking in equipment handling wet H2S.

CPD training in MT covers:

• Principles of magnetization and flux leakage
• Dry vs. wet particle methods
• AC vs. DC magnetization techniques
• Interpretation of indications and acceptance criteria
• Equipment calibration and procedure qualification

PT: Liquid Penetrant Testing

Liquid penetrant testing detects surface-breaking discontinuities in essentially any material — ferromagnetic or non-ferromagnetic. It is widely used on weld inspections, valve bodies, and heat exchanger tube sheets.

CPD training in PT covers:

• Penetrant types (fluorescent vs. visible) and developer applications
• The six-step process: pre-clean, apply penetrant, dwell, remove, develop, inspect
• Surface preparation requirements and their effect on test sensitivity
• Interpretation of linear vs. rounded indications
• Procedure qualification per ASME and API requirements

UT: Ultrasonic Testing

Ultrasonic testing is probably the most versatile and widely used NDT method in fixed equipment inspection. It is the primary method for measuring wall thickness and detecting internal flaws, making it essential for API 510 and API 570 inspectors managing corrosion under insulation (CUI) and general corrosion programs.

CPD training in UT covers:

• Pulse-echo and through-transmission techniques
• Contact vs. immersion testing
• Straight beam (for thickness and lamination detection) and angle beam (for weld inspection)
• Advanced techniques: phased array UT (PAUT) and time-of-flight diffraction (TOFD)
• Signal interpretation and calibration requirements

Inspectors involved in fitness-for-service assessments under API 579 will find UT knowledge particularly valuable, as thickness mapping and flaw sizing directly feed FFS calculations.

RT: Radiographic Testing

Radiographic testing uses ionizing radiation (X-ray or gamma ray) to image the internal structure of components, particularly welds. It is the traditional volumetric examination method and is still widely specified in ASME Code construction and repair work.

CPD training in RT covers:

• X-ray vs. gamma ray sources and their applications
• Film radiography and digital radiography (DR/CR) methods
• Image quality indicators (IQI/penetrameters) and sensitivity requirements
• Film interpretation and weld discontinuity identification
• Radiation safety fundamentals — critical for inspectors working around RT operations

VT: Visual Testing

Visual testing is the most fundamental — and most underestimated — NDT method. API inspectors rely on VT constantly: for external corrosion surveys, coating assessments, weld visual examinations, and general equipment condition assessments.

A structured VT CPD course is valuable because it formalizes what many inspectors do intuitively and ensures your visual examination practices meet the requirements of relevant codes and standards, including:

• Direct vs. remote visual examination techniques
• Lighting and distance requirements per ASME V and API standards
• Use of borescopes, cameras, and video inspection equipment
• Documentation requirements for visual inspection records

How to Choose NDT CPD Courses

When selecting NDT training for CPD purposes, look for courses that:

• Explicitly cover the NDT method in the context of in-service inspection (not just new construction)
• Reference relevant API and ASME standards (not just ASNT or AWS-specific content)
• Include a final exam with a passing score requirement
• Issue a certificate of completion showing course title, provider, date, and hours

Online courses that meet these criteria qualify for API ICP CPD documentation. Learn more about the documentation requirements in our guide to documenting CPD hours for API recertification.

Frequently Asked Questions

Do I need to be ASNT certified to take an NDT CPD course for API hours?

No. API ICP CPD credit is for expanding your knowledge as an inspector — it is not a certification program. You do not need ASNT Level II or Level III certification to take an NDT CPD course and count those hours toward your API recertification.

Can one NDT course count toward multiple API certifications?

Yes. NDT methods are relevant to all three API ICP certifications (510, 570, 653). A single UT or MT course can count toward CPD hours for all certifications you hold simultaneously.

How many CPD hours can I get from an NDT course?

Typically 4 to 16 hours depending on course depth. A focused method-specific course (e.g., an 8-hour UT for in-service inspection course) yields 8 CPD hours. Multi-method overview courses covering all five methods may yield more.

Is online NDT training accepted by API ICP?

Yes. Online NDT training with a final exam and a certificate of completion is accepted for API ICP CPD documentation. See our full guide on earning API CPD hours online.

Start Your NDT CPD Training Today

NDT is central to everything you do as an API-certified inspector. Investing a few hours in structured NDT CPD training keeps your skills sharp, satisfies your recertification requirements, and makes you more effective in the field.

Integrity Inspector Academy offers NDT and inspection technique courses designed specifically for API 510, API 570, and API 653 inspectors. Each course includes a final exam and downloadable certificate.

Browse available NDT CPD courses at Integrity Inspector Academy and start earning documented CPD hours today.