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NDT Services (Non-destructive Testing)

We offer a comprehensive suite of inspection services tailored to meet the unique needs of our clients.

Liquid Penetrant Testing (PT)

Liquid Penetrant Testing (PT): We employ liquid penetrant testing to identify surface-breaking defects in non-porous materials, ensuring the integrity and reliability of critical components.

Here’s how Liquid Penetrant Testing works:

Pre-Cleaning: The surface of the test specimen is thoroughly cleaned to remove dirt, grease, oil, paint, or any other contaminants that may interfere with the inspection. This ensures that the penetrant can enter and flow into any surface defects.

Penetrant Application: A liquid penetrant, which is typically a colored dye or fluorescent material, is applied to the surface of the test specimen. The penetrant is applied by spraying, brushing, or immersing the specimen into a penetrant bath, depending on the size and shape of the component being inspected.

Penetration Time: The penetrant is allowed sufficient time to seep into any surface-breaking defects by capillary action. This time period, known as the penetration or dwell time, is typically specified by the testing standards or procedures being followed.

Excess Penetrant Removal: After the penetration time, the excess penetrant on the surface is removed using a suitable cleaning method, such as wiping, rinsing, or using a solvent. The objective is to remove the excess penetrant while leaving the penetrant trapped within any surface defects.

Developer Application: A white or contrasting developer is applied to the surface. The developer helps to draw out the trapped penetrant from the defects by creating a high-contrast background. The developer can be in the form of a powder, liquid, or aerosol.

Indication Formation: As the developer is applied, it pulls the trapped penetrant out of the defects and spreads it on the surface, creating visible indications or “bleed-out.” The indications are examined for their size, shape, and location.

Inspection and Interpretation: The inspector examines the surface under suitable lighting conditions, which may include natural or artificial light, and may also use ultraviolet (UV) light to enhance the visibility of fluorescent penetrants. The inspector looks for any visible indications that are indicative of surface defects, such as cracks, porosity, laps, or other discontinuities.

Interpretation and Reporting: The inspector interprets the indications observed during the inspection, considering their size, shape, and location. The findings are documented in an inspection report, which may include details of the defects, their dimensions, and their locations on the test specimen.

Liquid Penetrant Testing is a versatile method that can detect surface defects in a wide range of materials, including metals, plastics, ceramics, and composites. It is particularly effective for identifying surface cracks, porosity, leaks, laps, and other surface discontinuities that could compromise the integrity of the material.

Qualified technicians or inspectors who have received proper training and certification should perform Liquid Penetrant Testing. They follow established standards and procedures to ensure accurate and reliable results.