Industrial
Service
Penetrant testing (PT), also called liquid penetrant inspection (LPI) or Dye penetrant inspection (DPI), is a widely applied and low-cost inspection method used to locate surface-breaking defects in all non- porous materials
Visible or fluorescent dye will be applied on test item, then the excess dye is removed after penetration time and a developer is applied onto it.
The developer is usually a dry white powder, which draws penetrant out of any cracks by reverse capillary action to produce indications on the surface. These (coloured) indications are broader than the actual flaw and are therefore more easily visible.
Advantage
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Only Non-Porous materials can be inspected.
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PT is used to detect casting, forging and welding surface defects such as hairline cracks, surface porosity, leaks in new products, and fatigue cracks on in-service components.
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Detects open surface defects.
