Dye Penetrant Inspection – One of the tests Performed at Pipe Masters

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Non-destructive tests are a set of techniques used in the inspection of materials and equipment, without damaging them. They are one of the main tools controlling the quality of materials and products, since they do not permanently change the condition of the component to be analysed, and thus save time and money in the evaluation, problem solving, preventing the occurrence of failures and product investigation.


The most frequent inspection methods on the market are:

  • Visual Inspection
  • Dye Penetrant inspection
  • Ultrasound Testing
  • Industrial Radiography


Dye Penetrant Inspection


The dye penetrant inspection is a method used to locate discontinuities, which are essentially relatively smooth and non-porous surfaces. It is a text widely used on metals.

The test consists of the ability of the dye to penetrant small openings in the surface of a part, flowing over the surface in a continuous and reasonably uniform manner, and then migrating through the cavities that are open to the surface. After the process of removing excess surface, the exit of the liquid from inside is stimulated by the use of a developer. The result is the appearance of coloured spots the surface.

This test can be applied during the manufacturing process, at the end of it or during maintenance (to detect the appearance of discontinuities in service).

It is widely used in non-magnetic materials such as aluminum, magnesium, austenitic satinless steels, titanium alloys, and zirconium, in addition to magnetic materials. It is also applied to glazed ceramics, glass and plastics.



Main benefits:

  • Simple process, easy to execute and to interpret;
  • Lower cost, when compared to other methods;
  • Low cost equipment;
  • Able to test pieces of varying sizes as well as isolated areas on the surface;
  • Ease of application, due to the simplicity of the process and the excellent sensitivity in detecting surface discontinuities.



As with any trial, there are disadvantages such as:

  • Detects only superficial discontinuities;
  • The materials to be tested must be non-porous;
  • Requires great care in handling liquids;
  • Cleaning after exaction is required to remove liquids from the examined part.




Testing for penetrating liquids at Pipe Masters


Despite its simplicity, this method requires a lot of experience and knowledge on the part of the inspector for accuracy in the inspection reports of the part. Pipe Masters has certified professionals who ensure adequate quality and accuracy for each inspection.


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