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September-October 2014 : Nondestructive examination, Nondestructive testing and Nondestructive inspection

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Written by Laurence
Friday, 19 September 2014 09:48

What is the difference between Nondestructive Examination and Nondestructive Inspection?

These terms are not defined in the EN 1330-1 and 1330-2 standards.

Looking at the ASTM E1316 – 11b standard, we read in “Section A: Common NDT terms”:

Nondestructive Evaluation – see Nondestructive Testing.

Nondestructive Examination – see Nondestructive Testing.

Nondestructive Inspection – see Nondestructive Testing.

This American standard, as you can see, does not make any difference between “Nondestructive Testing (NDT)”, “Nondestructive Examination (NDE)” and “Nondestructive Inspection (NDI).”

In this American standard, the following definition of the term “Nondestructive Testing” comes as follows:

“The development and application of technical methods to examine materials or components in ways that do not impair future usefulness and serviceability in order to detect, locate, measure and evaluate flaws; to assess integrity, properties and composition; and to measure geometrical characteristics.”

One of us asked a Member of the French Confederation for Non-Destructive Testing (COFREND), a specialist in terminology.

His answer:

"The habit is to tell NDI (Nondestructive Inspection) for inspections relating to the manufacturing process conformity, therefore mainly performed in factory, but also after on-site repair (conformity of a weld...).

While the term NDE (Nondestructive Examination) is used to name the examination, the purpose of which is to detect in-service damages.

The differentiation comes from the reason for examination. As an example about welded joints, the NDI looks for lacks of fusion, cold cracking, hot tearing and is a factor in the acceptance, or not, of the weld.

NDE deals more with the existence of fatigue cracks, stress corrosion, etc."

Furthermore, in the ISO 9712 standard, the paragraph 3.17 defines: NDT Method: “discipline applying a physical principle in non-destructive-testing. EXAMPLE: Ultrasonic testing.”

Similarly, in the EN 1330-5 standard, the paragraph 2.11 gives: Eddy Current testing: “Non destructive testing method using the electromagnetic effects of induced currents to evaluate the products to be tested.”

Here, no ambiguity: clearly, it is "nondestructive testing method" and NOT "nondestructive inspection method.”

 

Normative references

EN 1330-1:1998, Non-destructive testing – Terminology -. List of general terms, European Committee for Standardization, Brussels, Belgium, 1998.

EN 1330-2:1998, Non-destructive testing - Terminology - Part 2: Terms common to the non-destructive testing methods, European Committee for Standardization, Brussels, Belgium, 1998.

ASTM E1316 – 11b, Standard Terminology for Nondestructive Examinations, ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA, 19428-2959, USA, 2011.

ISO 9712:2012, Non-destructive testing -- Qualification and certification of personnel, International Organization for Standardization, Geneva, Switzerland, 2012.

EN 1330-5:1998, Non-Destructive Testing - Terminology - Part 5: Terms Used in Eddy Current Testing, European Committee for Standardization, Brussels, Belgium, 1998.

Last Updated ( Friday, 19 September 2014 14:23 )