A complete reference showing minimum training hours (classroom and on-the-job) required for NDT certification across all major schemes: ASNT SNT-TC-1A, ISO 9712, and PCN. Organized by method and certification level with side-by-side comparisons.
The Personnel Certification in Non-Destructive Testing (PCN) scheme is operated by BINDT (British Institute of Non-Destructive Testing). Based on ISO 9712, PCN has additional requirements specific to the UK and international markets.
Experience (OJT) must be documented and verifiable. Under SNT-TC-1A, the employer determines what qualifies as acceptable experience. Under ISO 9712 and PCN, experience must be in the specific NDT method and product sector.
Formal education in science, engineering, or technology can reduce the OJT/experience requirement under certain schemes.
Need this training matrix in an editable Excel format? Contact us for a customizable version with additional schemes (NAVSEA, NAS 410, EN 4179) and calculation tools.
What this page covers
1. ASNT SNT-TC-1A Recommended Training Hours
2. ISO 9712 Required Training Hours
3. PCN Training Requirements
4. Experience Requirements Detail
5. Education Credits
6. Side-by-Side Comparison: ASNT vs ISO 9712 vs PCN
7. Important Notes
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Classroom Training Hours (Minimum Recommended)
On-the-Job Training / Experience Hours (Minimum Recommended)
Minimum Training Duration (Hours)
Minimum Industrial Experience (Months)
PCN Training Duration (Hours) -- Minimum
Key points covered
Experience hours are recommendations. The employer's Written Practice defines actual requirements. Experience must be under the supervision of a Level II or Level III. Documentation is employer-controlled.
Experience must be gained under qualified supervision. At least 50% of experience must be in the product sector(s) for which certification is sought. Experience log must be verified by the employer and countersigned by a Level 3.
Experience must be gained performing NDT in the relevant method and sector. A minimum of 10% of total experience must be in the specific product sector applied for. Experience logs must be submitted to BINDT.
Employers, clients, and regulatory authorities may require more hours than the minimum specified by any scheme. Some industries (nuclear, aerospace) have significantly higher requirements.
Under both ISO 9712 and PCN, candidates may apply directly for Level 2 without first holding Level 1. However, they must complete BOTH Level 1 and Level 2 training hours and the combined experience requirement.
ASNT Level III requires passing the ASNT Level III Basic and Method exams (administered by ASNT nationally). ISO 9712 Level 3 requires an additional knowledge of materials science, manufacturing processes, and quality systems. PCN Level 3 includes a demanding practical and oral exam component.
Training hours for each method are independent. If certifying in UT and RT, you need the full hours for each method. However, some general/basic topics may overlap.
Most schemes require evidence of continuing professional development for recertification. Keep records of training courses, conferences, seminars, and NDT-related professional activities.
Advanced techniques (PAUT, TOFD, digital RT) may require additional training beyond the base method hours. Check your certification scheme for specific requirements.
Free written-practice gap check by an ASNT Level III
For employers certifying technicians under ASNT SNT-TC-1A: Anoop Rayavarapu, ASNT NDT Level III, will check your written practice against SNT-TC-1A — training and experience hours, exam composition, vision exams, recertification and Level III responsibilities — and tell you where the gaps are. Request a written-practice gap check.
ASNT SNT-TC-1A (2020) recommends 40 hours of classroom training for UT Level I and 40 more for Level II; ISO 9712:2021 mandates 64 and 80 hours for the same levels. The schemes diverge hardest on experience: SNT-TC-1A lets the employer's Written Practice define it, while ISO 9712 and PCN require documented method-and-sector experience verified by a Level 3.
The three schemes answer the same question differently. SNT-TC-1A is a recommended practice: its Table 6.3.1A hours — 40 per level for UT and RT, 12 and 8 for MT, 4 and 8 for PT, 8 and 16 for VT — bind only when the employer's Written Practice adopts them, and the employer certifies its own personnel. ISO 9712 is a hard standard: a third-party certification body verifies mandated training hours and industrial experience measured in months — 3 for Level 1 and 9 for Level 2 in UT, RT and ET, 1 and 3 in MT, PT and VT — before any examination is scheduled. PCN, operated by BINDT, implements ISO 9712 and layers on its own rules: 10 percent of experience in the product sector applied for, logs submitted to BINDT, and a demanding practical and oral component at Level 3. Formal science or engineering education reduces the experience requirement under defined conditions.
Source: ASNT SNT-TC-1A (2020 edition), Table 6.3.1A; ISO 9712:2021, Non-destructive testing — Qualification and certification of NDT personnel; PCN requirements per BINDT PCN/GEN documents.
Technically reviewed by Anoop Rayavarapu — ASNT NDT Level III (UT, RT, MT, PT, VT, ET) · API 653 · ISO 9001:2015 Lead Auditor
Minimum classroom training hours by method: SNT-TC-1A recommendation vs ISO 9712 requirement
Method
SNT-TC-1A Level I (hours)
SNT-TC-1A Level II (hours)
ISO 9712 Level 1 (hours)
ISO 9712 Level 2 (hours)
Ultrasonic Testing (UT)
40
40
64
80
Radiographic Testing (RT)
40
40
72
80
Magnetic Particle Testing (MT)
12
8
16
24
Liquid Penetrant Testing (PT)
4
8
16
24
Visual Testing (VT)
8
16
16
24
Eddy Current Testing (ET)
40
40
40
48
SNT-TC-1A figures are recommended minimums from Table 6.3.1A that bind through the employer's Written Practice; ISO 9712 figures are mandatory minimums verified by the certification body. PCN applies the ISO 9712 hours with BINDT's additional documentation. Direct Level-2 entry requires the combined Level 1 + Level 2 hours under both international schemes.
Who decides the actual training requirement under SNT-TC-1A?
The employer. SNT-TC-1A is a recommended practice, and the hour tables bind only once the employer's Written Practice adopts or modifies them. Experience must be gained under Level II or Level III supervision, documentation is employer-controlled, and clients or regulators can demand more than the published minimums — nuclear and aerospace programmes set significantly higher bars.
Can a candidate certify directly at Level 2 without holding Level 1?
Under ISO 9712 and PCN, yes — direct access is allowed, but the candidate must complete both the Level 1 and Level 2 training hours and the combined experience requirement before examination. Under SNT-TC-1A the Written Practice decides; employers routinely qualify technicians straight to Level II on the same combined-hours logic.
How do ISO 9712 and PCN treat experience differently?
ISO 9712 requires at least 50 percent of experience in the product sector for which certification is sought, with the log verified by the employer and countersigned by a Level 3. PCN, operated by BINDT, requires a minimum of 10 percent of total experience in the specific product sector applied for — and the experience logs are submitted to BINDT itself, not just held by the employer.
Does formal education shorten the path to certification?
Yes. Formal education in science, engineering or technology reduces the experience requirement under defined scheme rules — the clearest case is ASNT Level III eligibility, where a four-year engineering or science degree cuts the required experience to one year at Level II responsibility, against four years for a candidate qualifying on experience alone.
Do training hours carry over between NDT methods?
No. Hours are independent per method — certifying in both UT and RT means completing the full training hours for each, although general and basic topics overlap. Advanced techniques stack further: PAUT, TOFD and digital RT call for additional training beyond the base method hours, with the exact requirement set by the certification scheme.
What do the schemes require at recertification?
Evidence of continuing professional development: keep records of training courses, conferences, seminars and NDT-related professional activity. ISO 9712 and PCN certificates run a five-year validity with renewal on documented continuity and a recertification examination at ten years. SNT-TC-1A leaves the interval to the Written Practice, with five years as the recommended maximum.
Ask about NDT training dates and delivery
Tell us the methods and levels you need and how many technicians. We reply with available dates, the delivery options that fit, and what your written practice requires — usually the same working day.
The training matrix earns its keep when it is derived, not decorated: each role's requirements traced to their source — the Written Practice's hours per method and level, client contract clauses, regulatory and site inductions — so that when a source changes, the affected cells are findable. Track three dates per cell (completed, expires, scheduled) and review the horizon monthly; the matrix that only records completion is a history, and histories do not prevent the lapsed-certification finding that suspends a crew.
The matrix also prices decisions: cross-training a Level II into a second method against hiring, sequencing renewals before outage season, spotting the single-point-of-failure technician whose certifications nobody else holds. Those are management questions, and this document is where they become visible.
Where this document sits in the wider system
Templates fail as loose files and work as parts of a system: this document should cross-reference the records that feed it and the decisions it feeds, carry a revision history like any controlled document, and live where the whole team retrieves the CURRENT version — not the copy someone improved privately last year. Companies running their inspection operations on a single system of record generate most of these documents from live data rather than filling them by hand; that is the practical difference between managed records and managed paperwork. Browse all templates and resources, or ask how the generated version works.