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Introduction to NDT Inspection.

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What is NDT?

NDT which stands for Non-Destructive Testing, is a form of assessment in which inspectors are able to analyze and collect data about a material without bringing any damage to it.

In other words, NDT form of inspection is a testing technique which is implemented to evaluate a material, analyze its properties and components, in order to track down any defects without causing any damage or alteration to the material itself.

NDT is also called as Non-Destructive Examination (NDE), Non-Destructive Inspection (NDI) and Non-Destructive Evaluation (NDE).

Types of Non-Destructive Testing

There are various types of NDT available, each with their own advantages and disadvantages. The seven most common ones are listed below:

1) Ultrasonic Testing

In this type of non-destructive testing, high frequency sound waves are transmitted into a material which will aid in pointing out defects in the properties of the material.

2) Visual Testing

In this type of non-destructive testing, inspection and assessment is done simply though visual means or the naked eye. It is the most basic way of examining any material without bringing any damage or alteration to it.

3) Radiography Testing

In this type of non-destructive testing, radiation is passed through a test piece to analyse or detect any imperfections. X-rays are implemented on less dense materials whereas gamma rays are implemented upon denser materials.

4) Magnetic Particle Testing (MT)

In this type of non-destructive testing, defects are analysed and detected by examining disruptions in the flow of magnetic field of the materials.

These disruptions are also indicators which point to the particular locations of the defects in the material.

5) Eddy Current (Electromagnetic) Testing

In this type of non-destructive testing, strength of the electrical currents of a material is measured and analysed in order to detect the defects of the material which may also give you a location of the defect too.

6) Liquid Penetrant Testing (PT)

In this type of non-destructive testing, liquid is used to coat a material and defects are detected by looking for any breaks in the liquid.

7) Leak Testing (LT)

In this type of non-destructive testing, defects or imperfections are identified by analysing or inspecting for any leaks in a vessel or a structure.

Why should you implement NDT?

Here are some reasons highlighted below as to why NDT should be implemented by companies:

a) Savings

In NDT, the materials are examined and analysed for any defects in the materials without bringing any damage to the materials itself. This therefore, leads to saving costs and resources.

b) Efficiency

NDT allows for the assets to be examined for any imperfections or defects which is very important for ensuring that safety job practices are carried through in the workplace.

c) Accuracy

NDT techniques are proven to be accurate when it comes both to maintenance procedures as well as longevity of the materials.

Non-Destructive Testing can be conducted at each stage of construction. The materials or structures that are put to use can either be NDT approved or rejected or the materials can also be repaired.

NDT can provide great results when used correctly and effectively. There should be proper and correct knowledge of the various methods and their pros and cons, as well as the required standards for performing these tests.

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