Dye Penetrant Inspections (DPI), sometimes called Liquid Penetrant Inspections (LPI) are used to locate cracks, fractures and defects along the surface of non-porous materials, like non-ferrous metal, plastic and ceramic.

Dye penetrant inspections are a great way to make sure that welds don’t have any hairline fractures and that your pipes and tanks don’t have fatigue cracks or leaks.

How does it work?

  1. A section of pipe or another industrial equipment is chosen.
  2. Penetrant dye is applied to the section.
  3. The surface is wiped clean.
  4. Developer chemical is applied
  5. All surface cracks will be visible as colored lines, because of the dye.

This technique can be applied with a spray bottle, by immersion or by brushing penetrant onto a surface. It can even be done with a reactive dye and ultraviolet light.

The best part about this type of testing is that it can be done without causing harm to your equipment. Your facility will be able to operate, even while the inspection is taking place.

Let us help you keep your plant safe and secure with our non-destructive testing.