Scientific principles behind Penetrant Testing

Penetrant solution is applied to the surface of a clean component. The liquid is pulled into surface-breaking defects by capillary action. Excess penetrant material is carefully cleaned from the surface. A developer is applied to pull the trapped penetrant back to the surface where it is spread out and forms an indication. The indication is much easier to see than the actual defect.

Main Uses

Used to locate cracks, porosity, and other defects that break the surface of a material and have enough volume to trap and hold the penetrant material. Liquid penetrant testing is used to inspect large areas very efficiently and will work on most non-porous materials.

Main advantages of Penetrant Testing

• large surface areas or large volumes of parts/materials can be inspected rapidly and at low cost;
• parts with complex geometry are routinely inspected;
• indications are produced directly on surface of the part providing a visual image of the discontinuity;
• equipment investment is minimal.

Inspections & Surveys

At Ned Marine we provide comprehensive inspections and surveys for many of our clients. Do you want to assess the condition, safety, and compliance of your vessels, offshore structures, or industrial assets? Our certified surveyors conduct pre-conditional surveys, special surveys, and hull inspections, identifying structural issues, corrosion, or coating failures before they become costly problems.

We work globally, on land, in dock, and at sea, ensuring compliance with classification societies and industry regulations. Whether for preventive maintenance or regulatory requirements, our inspections deliver clear, detailed reports to help you make informed decisions and maintain operational excellence.

Our Non-Destructive Testing (NDT) services:

Ultrasonic Testing | Magnetic Testing | Penetrant Testing | Visual Inspection | Vacuum Box Testing | Eddy Current Testing