LIQUID PENETRANT TESTING (LPT)

Liquid Penetrant Testing or Dye Penetrant Testing (LPT/DPT) is based on the principle of capillary action and is used to detect surface defects. Penetrant of low surface tension penetrates into cracks that are open to the surface.

The liquid penetrant testing method gives the best sensitivity for surface defects and defects up to 0.1 inches can be identified. LPT is a low-cost surface inspection Nondestructive testing method and mostly used in most of the industries where the welding process is required such as Fabrication, Manufacturing, Casting, Forging, and Piping, etc.

Advantages of Liquid Penetrant Testing

- LPT is used to inspect a wide range of materials.

- Liquid penetrant inspection is easy to perform.

- Investment is low as compared to other NDT methods.

- It is a very portable inspection method as it comes in aerosol spray cans also.

- A large part or big area can be inspected with good speed and at a low cost.