Liquid Penetrant Inspection

Liquid penetration test (Penetrant Test). This method is applied to detect surface-open discontinuities in non-porous materials. In this method, a penetrant containing dye is applied to the surface to be tested. After waiting a sufficient time for the penetrant to penetrate the discontinuities, the excess penetrant is cleaned. Then the developer is applied to the surface. The penetrant, which has penetrated into the discontinuity, is absorbed by the developer towards the surface, thus detecting the presence, location, size and feature of the discontinuity from the color contrast. The technique, place, time and quality levels to be applied are decided by our Level-3 experts in line with customer demands.

Advantages...

 

  • It is relatively cheaper.
  • It is a very portable and simple NDT method.
  • It is very sensitive to thin and adjacent (up to 100 micron) discontinuities.
  • It can be applied to many kinds of materials.
  • Regardless of the direction, all surface discontinuities can be detected at once.

Disadvantages...

 

  • The test surface must be extremely clean.
  • It can only detect discontinuities opening to the surface.
  • It cannot be used on porous materials and is difficult to use on very rough surfaces (eg casting).
  • It may be necessary to clean the material surface after testing.

SPECIAL PENETRANT INSPECTION APPLICATIONS

 

Inspection of Liquid Oxygen Compatible Materials

Liquid oxygen is used in many applications today. Although liquid oxygen itself is not flammable; when it comes into contact with a combustible material, it becomes flammable; A small spark is enough to cause a serious glow.

For this reason, the parts to be used in a system with liquid oxygen must not contain flammable materials. A very thorough cleaning process is applied to such parts. During the manufacture and inspection of such a part, special care is taken to avoid contamination of the part with flammable substances.

 

Inspection for Nickel and Nickel Alloys

When nickel and nickel alloys are in a sulphur-containing environment, they are subject to a type of corrosion defined as corrosion under load, this type of corrosion can cause cracks in your material. For this reason, specially produced penetrant materials with low sulfur content should be used in the inspection of nickel and nickel alloys.

 

Inspection of Stainless Steels, Titanium and Titanium Alloys

Stainless steels, duplex stainless steels, titanium alloys are subject to corrosion under load when they are in a chlorine-containing environment. For this reason, specially produced penetrant materials with low chlorine content should be used in the inspection of these materials.

 

Penetrant Application for Plastic and Rubber

Plastic and rubber are often damaged by penetrant materials. When in doubt on this subject, penetrant materials to be used should be tested on a small sample. Penetrant inspections with special formulas are carried out for the inspection of plastics and rubbers.

 

Penetrant Application Compatible with the Food Industry

Special penetrant materials containing harmless dyes and edible oils have been developed for the inspection of equipment used in the food industry.

 

Inspection for High Temperatures

The surface temperature of the material to be inspected should be below 52°C. However, sometimes we may need to inspect before waiting for your material to cool. In order to meet this need, our penetrant inspections, which can be used reliably at high temperatures, are carried out.

 

Inspection at Low Temperatures

The surface temperature of the material to be inspected should be above 5°C. However, sometimes we may need to inspect without waiting for your material to warm up. In order to meet this need, our penetrant inspections, which can be used reliably at low temperatures, are carried out.