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Understanding ASNT SNT-TC-1A Recommended Practice and CP-189 Standard Dr. Boris Muravin. ASNT Level III in Acoustic Emission training series. About SNT-TC-1A.

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Understanding ASNT SNT-TC-1A Recommended Practice and CP-189 Standard Dr. Boris Muravin

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Understanding asnt snt tc 1a recommended practice and cp 189 standard dr boris muravin

Understanding ASNT SNT-TC-1A Recommended Practice and CP-189 Standard

Dr. Boris Muravin

ASNT Level III in Acoustic Emission training series

More at www.muravin.com

About snt tc 1a

About SNT-TC-1A

  • Recommended practice was developed by the American Society for Nondestructive Testing as a standard guide of qualification and certification of NDT personnel by the employer.

  • It is not a strict specification.

  • The first edition was published in 1966, following editions 1968, 1971, 1975, 1980, 1984, 1988, 1992, 1996 and 2001.

  • The last edition was published in 2006.

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Thirteen test methods covered

Thirteen Test Methods Covered

  • Acoustic Emission Testing.

  • Electromagnetic Testing.

  • Laser Testing Methods.

  • Leak Testing.

  • Liquid Penetrant Testing.

  • Magnetic Flux Testing.

  • Magnetic Particle Testing.

  • Neutron Radiographic Testing.

  • Radiographic Testing.

  • Thermal/Infrared Testing.

  • Ultrasonic Testing.

  • Vibration Testing.

  • Visual Testing.

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Goal of the practice

Goal of the Practice

  • Provide an outline for Employer for qualification and certification of NDT personnel.

  • It is up to Employer to modify the recommended practice to meet his specific requirements.

  • “Certification is written testimony of qualification”.

  • “Qualification is demonstrated skill, demonstrated knowledge, documented training, and documented experience required for personnel to properly perform the duties of a specific job.”

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Personnel qualification levels

Personnel Qualification Levels

  • SNT-TC-1A defines three levels of qualification.

  • A person before certification for one of three levels is considered trainee.

  • More levels can be introduced by Employer if needed.

  • NDT Level I is the first qualification level. Level I operates under Level II or Level III instructions and supervision. Level I can perform some of calibrations or tests and even document them according to written procedures.

  • NDT Level II should be capable to interpret results and be familiar with test application, scope and limitations of the test. Level II can guide and supervise trainees and Level I personnel.

  • NDT Level III should be capable to develop new techniques, codes and standards, interpret and report results, develop acceptance criteria, train and examine Level I and II, be familiar with other NDT methods, manufacturing processes and materials.

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Employer s written practice

Employer’s Written Practice

  • SNT-TC-1A recommends that Employer will establish a written practice that specifies training, experience and examination requirements for NDT personnel.

  • Written practice should define responsibilities of all Levels.

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Recommended training and experience requirements

Recommended Training and Experience Requirements

  • SNT-TC-1A defines experience and education requirements for all three levels.

  • AE Level I criteria: 40 hours of training, minimum 210 hours experience gained during 1.5-9 months or alternatively 3 months of work experience. Those finished 2 years in collage need 32 hours.

  • AE Level II criteria: 40 hours of training, minimum 630 hours of experience gained during 4.5-27 months or alternatively 9 months of experience.

  • AE Level III criteria: 4 years of collage or university + 1 year of experience beyond the Level II requirements or 2 years of collage or university + 2 years of experience beyond the Level II requirements or 4 years of experience.

  • Direct Level II certification requires sum of training and experience of Level I and II.

  • Level III training and experience should be sum of Level I and II.

    • ANSI/ASNT CP-105-2006 “ASNT Standard Topical Outlines for Qualification of Nondestructive Testing Personnel” provides outlines and references for organized training courses.

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  • Level III is responsible for exam and grads or a qualified person delegated by Level III.

  • Level I and II exams consist of specific, general and specific examinations.

  • Average grade should be above 80%. No individual exam can be below 70%.

  • Acoustic Emission Level I general exam has 40 questions, specific exam 20 questions.

  • Acoustic Emission Level II general exam has 40 questions, specific exam 20 questions.

  • Practical exams for Level II and III should have at least ten different checkpoints requiring an understanding of test variables and specific procedures.

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Vision examinations requirements

Vision Examinations Requirements

  • Near-Vision Acuity. According to Jaeger Number 2 or equivalent, not less than 12 inches(30.5 cm) on a standard Jaeger test chart.

  • Color Contrast Differentiation.

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  • ASNT philosophy is that the Employer is responsible for certification of all Levels.

  • All experience, training and exams should be documented and kept in file.

  • Certification can be revoked by Employer and personnel re-examined any time.

  • Recommended re-certification interval is 5 years.

  • Certificate revoked when employment is terminated.

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Snt tc 1a vs cp 189

SNT-TC-1A vs. CP-189

  • SNT-TC-1A is recommended practice for qualification and certification. It uses “should” wording.

  • CP-189 is standard for qualification and certification. It uses “shall” wording.

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Cp 189 ndt levels

CP-189 NDT Levels

  • There are six levels of qualification according to CP-189.

  • NDT Level III is holder of ASNT Level III, PdM Level III or ACCP Professional Level III certificate.

  • NDT Level I and II are similar in responsibilities with SNT-TC-1A.

  • NDT Level II limited has similar responsibilities of techniques with NDT Level II but only in specific techniques (radiographic and ultrasonic) specified in Appendix B of CP-189. No techniques defined for Acoustic Emission.

  • Trainee – person that have not certified yet for any level.

  • NDT Instructor – an individual qualified to perform education and training of NDT personnel.

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Criteria for ndt instructor

Criteria for NDT Instructor

  • ASNT Level III certificate OR

  • Academic credentials equivalent to B.S. in exact science and adequate knowledge in the NDT method OR

  • Graduate of a two-years school of science or NDT and have at least 5 years as an NDT Level II.

  • Have 10 years of NDT experience as an NDT Level II.

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Cp 189


  • Written specific and practical examinations for Level III.

  • NDT Level I and II should have general, specific and practical examinations.

  • Vision examination using Jaeger Number 1 at a distance not less than 12 inches. Annual vision exam. Color exams during each rectification.

  • Recertification after 5 years.

  • Re-examination after 10 years.

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