Kitz Corporation of Europe

Did you know ...?

What are non-destructive tests, NDT? They are those tests that are carried out to detect defects, and that carried out on a material, imply an imperceptible or null damage.

What's your objective?

  • Discontinuity detection, corrosion assessment, stress determination and leak detection.
  • Evaluation of chemical characteristics, structural, mechanical and technological aspects of materials.
  • Thickness control; thickness measurements, coating thickness measurements (paint or surface treatments).

There are a large number of different tests, but this document describes the main ones that are applied to valve components.

Within the DISCONTINUITY DETECTION group, its classification is based on the position of the discontinuity (defect) to be detected:

  • Superficial: They provide information on superficial defects in materials.
    • VT (Visual Inspection) They detect defects only on the surface (open to the surface).
    • PT (Liquid Penetrant) Detect defects only on the surface (open to the surface). For carbon steels and stainless steels.
    • MT (Magnetic Particles) They detect defects only on the surface (open to the surface) and subsurface (within the surface, but very close to it). Only for magnetic materials (carbon steel). It is the cheapest.
  • Volumetric: They provide information on internal and subsurface defects in materials.
    • RT (Radiography): It is usually applied in casting material.
    • UT (Ultrasonic): It is usually applied in bar and forging material.
  •  Tightness (capacity to contain a fluid): Leak tests, pressure change, bubble tests, etc.

In the CHARACTERISTICS EVALUATION group, at Kitz Corporation of Europe we ask our suppliers that all those materials that require a 3.1 certificate have an evaluation of their chemical and mechanical characteristics, carrying out different tests depending on the material to be treated: hardness test, PMI ( For Stainless Steel materials), chemical composition analysis, etc.

As CONTROL measures within the quality department, different tests are carried out to test the adhesion of paint in our valves, thickness measurement, roughness measurement, etc.

Below are images of some of the most common tests.

Magnetic particles

Penetrating liquids