Dye Penetrant Inspection

Dye Penetrant Inspection, Also known as penetrant testing (PT), liquid penetrant inspection (LPI) or fluorescent penetrant inspection (FPI). It is a method that is used to revel surface breaking flaws by bleed out of a coloured or fluorescent dye from the flaw. Dye Penetrant Inspection can be used on almost any non-porous material. The technique of Dye Penetrant Inspection is based on the ability of a liquid to be draw into a clean surface-braking flaw by capillary action. After a period of penetration time, excess surface penetrant.

Is removed and a developer applied. This draws the penetrant from the flaw to reveal its presence. Colour contrast penetrant requires good white light while fluorescents need to be used in darkened conditions with an ultra violet light (Also known as black light).


It is essential that the material is carefully cleaned first, other wise the Dye Penetrant Inspection penetrant will not be able to enter the defect. If surface penetrant is not fully removed, misleading indications will result.



Radiography

Ultrasonic Testing

Magnetic Particle Testing

High Pressure Testing

Positive Material Identification

Visual Inspection