Non-Destructive Testing

Non-Destructive Testing (NDT) 

We can provide the independent UT MT PT RT inspection service for the areas of offshore, civil steel structure, storage tank, and long pipeline in accordance with international codes and standards.

Ultrasonic Testing

In order to detect internal discontinuity in the material, ultrasonic pulse-waves are introduced. The sound waves generated by an ultrasound transducer are launched into the material being tested. As the sound travels through the material, reflections or echoes occur at the back surface. Any internal discontinuity will reflect the sound wave and generate a signal into the receiver. The time lags of the echoes are measured in order to determine the thickness of the material and the distance to the discontinuity in the product.

Magnetic Particle Inspection

Magnetic Particle Inspection (MPI) can be used for the detection of surface and near-surface flaws in ferromagnetic materials. To conduct such inspection, a permanent magnet, electromagnets, or electromagnetic coils are used to build up a magnetic field to the item being tested. If there is a flaw present within the item, the magnetic flux will be distorted and will 'leak'. 　　Fine magnetic particles (normally used in spray form in carrier fluid) are applied to the surface of the specimen. They are then attracted to the area of flux leakage, creating a visible flaw indication.

Penetrant Inspection

Penetrant Inspection is a widely used and low cost inspection method. It is used to locate cracks in all non porous materials such as metals and plastics. This method involves applying a visible or fluorescent dye to the surface of the item being tested. This dye could be a solvent or water washable. After the application in the form of immersion or a spray, the dye enters any discontinuities via capillary action. It is known as the dwell time and usually will require a minimum of 20 minutes.

Radiography Inspection

Radiography is a non-destructive method that is very useful for detecting hidden flaws in materials and fabrications. In particular, it is exceptionally good at detecting volumetric flaws such as voids, gas pores and solid inclusions. The nature and dimension (length and width) of flaws are also easily recognized although it cannot be used to measure the thickness of defects.

Another benefit of this technology is that it provides a permanent record of the flaw. This is done by putting the item being inspected onto a photographic film. In order to do this a source of ionising radiation is positioned at one side of the item that is to be inspected, and a photographic film is placed in close proximity to the other side. The radiation is then partly absorbed during transmission and differences in material thickness or absorption qualities are recorded on the film.