Non-Destructive testing

Magnetic Particle Inspection (MPI)

Magnetic Particle Inspection (MPI)  is a cost-effective method used to identify surface and near-surface flaws in ferromagnetic materials. This method can be used on in-service and newly fabricated assets to determine its conformity to required standards.


Fabrication defects or component wear due to service usage, such as cracks, laminar tears or lack of weld fusion can be easily detected by utilisation of finely divided magnetic particles. At Quality Experts Limited, we use a wide range of MPI testing technologies like dry powder, wet particles or florescent particles in a liquid carrier depending on the component being tested thus giving our clients the most accurate testing results.


Our magnetisation equipment; magnetic probes, permanent magnets, DC Yokes, AC-DC Yokes and magnetic coils are the latest technology in the market and maintained within the calibration period guaranteeing high-intensity magnetic fields for good sensitivity in flaw indication.

Pressure Vessel undergoing Magenetic Particle Inspection

Pressure Vessel undergoing Magenetic Particle Inspection

Dye Penetrant Testing (DPT)

Dye Penetrant Testing (DPT) popularly known as Liquid Penetrant Inspection (LPI) is another easy and cost effective method of inspection. Its main limitation is that it is limited to detection of flaws open to the surface. It is, however advantageous in the sense that it can be used on both ferrous and nonferrous-magnetic materials such as aluminium and copper.


This method of inspection uses the principle of capillary action where the liquid is drawn into the defects and, after subsequent development; any surface-breaking defect is rendered visible to the human eye. The penetrant is either made of a coloured bright persistent dye that is easily viewed under natural or artificial light or a fluorescent compound that is easily detectable under ultra-violet light.


DPT is a common technique for detection of cracks, laminations, laps and zones of surface porosity in a wide range of components. As earlier indicated, it can be used in flaw detection in almost any component from wrought and cast iron to alloys, ceramics, ferrous materials, glassware and some polymer components. Our inspectors who have many years of experience assure the best integrity assessment of your products; be they large or small or of simple or complex configuration.

Dye Penetrant Testing

Dye Penetrant Testing

Ultrasonic Testing (UT)

Ultrasonic testing (UT) method is a highly specialised inspection method used for flaw detection of both internal and surface defects. It uses high-frequency sound waves to measure material thickness UT thickness gauging) and detect surface and subsurface flaws. It is often used to locate manufacturing defects in welds and castings, complete corrosion and erosion monitoring, and support large-scale corrosion mapping. This inspection method proves useful for precise flaw detections in in-service equipment, parts and assemblies such as boiler weld seams, pipelines, storage tanks, engine blocks, ship hulls etc. Highly skilled personnel and precision equipment are required for accurate interpretation and presentation of the data.


At Quality Experts Limited, we have sophisticated Ultrasonic Flaw Finding and Ultrasonic Thickness Gauging (UTG) equipment with angular and normal probes for flaw detection and thickness gauging to ensure that accurate data is acquired at all times. Our UT flaw detection machines are acquired from Olympus, a world-renown precision equipment manufacturing company. Quality Experts Limited UT testing personnel are also highly trained with  years of experience working in diverse industrial setups.

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