Liquid Penetrant Testing (PT / DPT)

Also called as Dye Penetrant Testing (DPT/ DPI), the penetrant
testing method is a development of the original oil and whiting
method that has been used for many years in the detection of
defects which outcrop at the surface of a component.
It can be utilized for both ferrous and non-ferrous materials but i
s particularly useful when components manufactured from non-ferrous
materials and austenitic steels are to be examined and the more
discriminating magnetic particle test cannot be employed.

      

It can be used either in a laboratory application or on site.
The detecting medium may be either a red dye that is visible
 under normal lighting conditions or a fluorescent dye which requires
 the use of an ultraviolet lamp. It is particularly useful in the laboratory
 as a cost effective method of testing small machined components
 in large batch quantities.

 Typical Applications
The detection of outcropping defects in ferrous, non-ferrous castings,
 forgings and fabrications for use in aerospace, automotive, oil & gas and medical industries.
Fatigue cracks that have developed in service'
Fatigue cracks in chains and lifting gear.
Riveted seams for the detection of leaks.
 Equipment available
Liquid Penetrant Materials
Ultraviolet Light Assemblies for Fluorescent Examination