What is the difference between SNT-TC-1A and CP-189?

Are you wondering – what is the difference between SNT-TC-1A and CP-189?

Well, the biggest difference between the two is that SNT-TC-1A is a set of recommended standards for NDT companies to use when certifying NDT technicians. On the other hand, CP-189 is intended to be a set of standard requirements, rather than a guideline.

Both use training, experience and examination to award NDT certification. However, while NDT inspection companies can alter certification requirements to meet their needs and the needs of technicians under the SNT-TC-1A program, CP-189  requirements cannot be adjusted.

Another major difference between is the number of NDT levels offered. The SNT-TC-1A only has three levels of certification – Level I, Level II and Level III. The CP-189, on the other hand, has five levels. In addition to Level I, II and III, CP-189 also has trainee and instructor levels.

NDT companies commonly use SNT-TC-1A in conjunction with CP-189 to create a company-administered NDT qualification system.