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ASNT SNT-TC-1A vs EN ISO 9712: NDT Certification Comparison
Two systems dominate NDT personnel certification worldwide: the American ASNT SNT-TC-1A and the international standard EN ISO 9712. NDT companies in Turkey need to evaluate both carefully, depending on which markets they serve and what their clients expect.
What is ASNT SNT-TC-1A?
ASNT SNT-TC-1A (Recommended Practice No. SNT-TC-1A) is a recommended practice published by the American Society for Nondestructive Testing (ASNT). It provides a framework for qualifying and certifying NDT personnel — but application varies from company to company, because the document is a recommended practice, not a prescriptive standard.
Key Features
- Employer-based system: The employer firm issues the certification. The company creates its own Written Practice and evaluates personnel against it.
- Three levels: Level I, Level II, Level III
- Level III central exam: ASNT offers a central exam for Level III candidates (ACCP), but it is not mandatory.
- Common use cases: US market, international projects with US clients, ASME-scope inspections
What is EN ISO 9712?
EN ISO 9712 is the ISO standard that has become the global reference for NDT personnel certification. It is applied in Europe, Turkey, and any country that adopts the ISO framework.
Key Features
- Independent certification body: Certification is issued by a TÜRKAK-accredited (ISO 17024) body independent of the employer.
- Three levels: Level 1, Level 2, Level 3
- Mandatory written and practical examination: Standardized exams are required at every level.
- 5-year validity with periodic renewal
- Defined scope: The certificate specifies both the method (UT, MT, RT, etc.) and the industrial sector (welds, castings, tubes, etc.).
Key Differences
| Criterion | ASNT SNT-TC-1A | EN ISO 9712 |
|---|---|---|
| Identity | Recommended practice | International standard (ISO) |
| Certifier | Employer company | Independent certification body |
| Standardization | Varies by company | Standardized exam + procedure |
| International recognition | US-centric projects | Europe, Middle East, global |
| TÜRKAK/accreditation fit | Not directly aligned | Accredited under ISO 17024 |
| Renewal | Company-specific | Periodic renewal every 5 years |
The Situation in Turkey
In Turkey, EN ISO 9712 is the standard system applied through TÜRKAK-accredited certification bodies. EN ISO 9712-certified personnel is a prerequisite for NDT companies seeking ISO/IEC 17020 accreditation.
ASNT certificates are not legally invalid in Turkey, but TÜRKAK audits and Turkish regulatory references point to EN ISO 9712. If you work with US firms or projects specifying ASME, ASNT adds value as a supplementary credential.
Which System to Choose?
Choose EN ISO 9712 if you:
- Operate in the Turkish market with TÜRKAK accreditation
- Work on European or Middle Eastern projects
- Target ISO 17020 accreditation
- Have clients who require independent, impartial certification
ASNT adds value if you:
- Work with US-based clients or projects
- Perform inspections under ASME scope
- Want dual certification as a competitive advantage in international markets
What to Track in Personnel Certificate Management
Regardless of the system, you should monitor at minimum:
- Certificate number and type (ASNT or EN ISO 9712)
- Scope: method and sector
- Expiry date
- Renewal requirements (visual acuity test, activity record)
- Whether a new application is needed if the method or sector changes
Linking this information to work orders — automatically verifying that the assigned technician is qualified for the specific task — improves both audit readiness and operational efficiency.
ceres-ndt stores certificate data for both systems and automatically checks technician eligibility when work orders are opened. Get in touch to book a demo.
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