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Sylvia Mathews Burwell

What is NDT?

NDT is a single Dimensional measurement.

What is the purpose of doing NDT?

For any material products the premature failures are due to corrosion, erosion and fatigue failure. In all these process material eating away will takes place that result in reduction of material thickness finally premature failure will occur in addition to that failure in load carrying capacity. Mostly the shape of defects is linear in nature. Linear type are having sharp edges and they acts has a “stress riser” upon the pressure and tend to propagate. That’s why linear defects are detrimental to the product than rounded defects.
So, finally in all NDT methods we measure the length of the defects only.

Expansion of Single Dimensional “measurement”

For any measurement, two basic components are very essential.

  • Person to measure
  • Equipment to measure

The document that deals with the measuring persons, here the NDT personnel is termed as written practice and administration of NDT personnel.
Then, the document that deals with the measurement equipment is written procedure.

Qualifying NDT personnel

There are basically two types of NDT personnel qualification

  • Company requirement based on SNT-TC-IA.
  • Specific requirement based on CP-189.

ASNT’s SNT-TC-IA is serving as a guide to prepare a written practice. According to SNT-TC-IA, the NDT personnel’s are qualified based on.

  • Physical Examination Comprises
  • Vision Acuity
  • Near Vision (Jaeger Chart)
  • Color Vision (Ishihara Chart)
  • 18% gray chart

A person capable of reading J1 letter size of 1.5mm height at a distance 12 inch with corrected or uncorrected at least one eye enable to detect 2mm defect size. As per SNT-TC-IA NDT personnel qualification comprises in two parts.

Written Examination Comprises

  • General 40 Questions
  • Specific 20 Questions
  • Practical 10 Questions

There are three levels of qualification.

  • NDT Level I
  • NTT Level II
  • NDT Level III

Duties of NDT Level I, II, III – in short

  • Level I record the test results.
  • Level II Set up and calibrate the equipment and report preparation.
  • Level III qualifies Level I of Level II.

Overall NDT Methods are categorized into Basic NDT and advanced NDT Methods. Also, they are classified into surface NDT Methods (test result found on the test surface itself) and subsurface NDT Methods (needs separate recording medium).

Five Building Blocks of NDT

1. Basic Principle
2. Artificial Defect
3. Probing Media
4. Testing Media
5. Recording Media

Test Parts and Documents

The overall NDT Methods rely on two things -the test part (Interpretation) and the document (Evaluation). Interpretation determines the cause and nature of defects and Evaluation is determining the Severity of defects. Test results from the test parts have been compared with the documented acceptable standard. Deviation of test results with the observed test results cause for rejection.
We, the MATRIX Institute of NDT regularly conducting NDT Level I & II training and certification programme in MT, PT, RT, RTFI, UT, ET and VT both it in – house and at customer premises.

Over 700 persons have been effectively trained and certified by MATRIX Institute of NDT in the past two decades.

More Success with Well-Trained Employees

The success of your business depends on a well-trained workforce. Choose training and advanced education from MATRIX – customized to meet your specific needs. Our instructors provide practical training at your site and technical facilities. Take advantage of our experts’ know-how and specialist knowledge to qualify your employees.

Benefits at a Glance

With the training courses and qualification programs MATRIX offers your personnel, you:

  • Train your employees as extremely well-trained professionals
  • Take advantage of our many years of experience conducting personnel qualification programs
  • Take advantage of our individually customized training programs
  • Prove to your customers that your employees have the proper specialized expertise for their needs

The training courses we offer on NDT & Welding Inspection are considered as most suitable and industry relevant. Certified engineers can be directly employed on various engineering projects/companies in manufacturing and in-service inspections to perform meaningful NDT interpretations. Special sessions on international NDT codes, standards and customer specifications / NDT procedures are included for each course to understand and implemented for effective improvement of quality.

MATRIX NDT offers unique practical based certification training on NDT & Welding Inspections. Training programs for NDT & welding has been designed in such a way that theory is blended with on-job practical training at our NABL Accredited ISO17025:2005 certified labs in Hosur, Tamilnadu, India.