Key takeaways
- ISO 9712 is the international standard for qualifying and certifying NDT personnel, per method and per industry sector.
- Level 1 performs tests under supervision; Level 2 sets up, performs, interprets and reports; Level 3 establishes techniques and procedures and directs NDT work.
- Certificates are valid for a limited period and require a yearly near-vision check.
- Always check the method, the sector and the expiry date on the certificate, not just the level.
When you hire an NDT company or check a report, the first line of the certificate usually reads “ISO 9712 Level 2” or “Level 3”. But what may each level actually do, and what should you check before you accept a result? This guide explains the three NDT certification levels under ISO 9712, how certification works, and the practical checks that prevent disputes over who was allowed to sign a report.
What is ISO 9712?
ISO 9712 sets out how personnel performing non-destructive testing are qualified and certified. Certification is issued by an independent certification body and covers one method (for example UT, RT, MT, PT or VT) in one or more industry sectors (such as welds, castings, forgings or pre- and in-service testing). A candidate needs training, industrial experience and a passed examination with general, specific and practical parts. The North American alternative is employer-based certification to ASNT SNT-TC-1A, described on the ASNT website.
ISO 9712 levels 1, 2 and 3 explained
Level 1: performs tests to written instructions
A Level 1 operator sets up the equipment and carries out tests following written instructions, under the supervision of Level 2 or Level 3 personnel. Level 1 may record and classify results against written criteria, but may not choose the technique or interpret results independently.
Level 2: performs, interprets and reports
Level 2 is the working level on most projects. A Level 2 operator can select the technique within the procedure, set up and verify equipment, perform the test, interpret and evaluate results against codes, standards and specifications, write NDT instructions, and prepare and sign test reports. Level 2 can also supervise Level 1 staff.
Level 3: establishes and approves techniques and procedures
Level 3 personnel take technical responsibility for NDT. They establish and validate techniques and procedures, interpret codes and specifications, choose the methods for a specific application, and can direct all tasks at Levels 1 and 2. Advanced techniques and new applications normally need Level 3 approval before use.
ISO 9712 levels at a glance
| Task | Level 1 | Level 2 | Level 3 |
|---|---|---|---|
| Perform tests to written instructions | Yes | Yes | Yes |
| Set up and verify equipment | Yes | Yes | Yes |
| Interpret and evaluate results to standards | No | Yes | Yes |
| Write NDT instructions | No | Yes | Yes |
| Sign test reports | No | Yes | Yes |
| Establish and approve procedures | No | No | Yes |
| Direct and supervise NDT personnel | No | Level 1 | Levels 1 and 2 |
Validity, renewal and vision tests
ISO 9712 certificates are valid for a limited period, normally five years, and must then be renewed or recertified following the rules of the certification body. The holder must also pass a near-vision test every year, and the employer must confirm that the person has worked in the method without significant interruption. A certificate that is valid on paper but lacks a current vision test does not meet the standard.
What to check before accepting an NDT report
- Method: the certificate covers the method used (for example UT), and for advanced techniques such as PAUT or TOFD, the scope required by the specification.
- Sector: welds, castings or forgings, matching the product tested.
- Level: Level 2 or Level 3 for anyone who interprets results and signs reports.
- Validity: expiry date and current annual vision test.
- Procedure: a written procedure approved by Level 3, with acceptance criteria from the right standard.
Practical tip: ask for copies of certificates and vision tests when you receive the NDT proposal, not after the first report. It is the simplest way to avoid re-testing.
Our NDT personnel are certified to ISO 9712 Level 2 and Level 3. See our NDT services and NDT personnel leasing.
ISO 9712 Level 2 and Level 3 operators for VT, PT, MT, UT, PAUT, TOFD, AUT and RT, onshore and offshore.
Frequently asked questions
Can a Level 1 operator sign an NDT report?
No. Level 1 may record results against written criteria, but interpreting results and signing reports require Level 2 or Level 3.
Is ISO 9712 the same as ASNT certification?
No. ISO 9712 is certification by an independent body. ASNT SNT-TC-1A is a guideline for employer-based certification. Some projects accept either; always follow the specification.
Does a UT certificate cover PAUT and TOFD?
Not automatically. Advanced ultrasonic techniques usually need specific training, experience and, depending on the certification body and client, a separate qualification or endorsement.
