KOSTEC

Special Examination

PAUT/TOFD

Phased Array Ultrasonic Testing(PAUT) technique and Time of Flight Dffraction(TOFD) can be used in independence or combination, and provide the speed and reliability better than conventional ultrasonic testing
PAUT: PAUT arranges the multi elements to perform UT, and provides a real-time scan image by ultrasonic having various amplitudes penetrating a product, and a result data can be re-constructed in an eletric file, and also, higher re-construction provides a precise analysis
TOFD: TOFD collects a diffraction signal raised from a discontinuity with a surface wave and reflecting wave, and a test result is made by an electric file, and it can be re-constructed if needs

Guided Wave Testing

GWT detects a discontinuity with collecting a signal reflected from an acoustic wave sent along a surface of material(plate and pipe)
For loss of wave energy, test extension can be a few hundred meters if case by case
Typically, it is used the insulation and underground piping corrosion testing in a petrochemical plant

IRIS

IRIS(Internal Rotary Inspection System)
IRIS is a detecting method for a discontinuity inside or outside of product by probe being into a tube or pipe filled a water or liquid

PMI

PMI(Positive Material Identification)
PMI provides the metal content by analyzing the energy released from the various metals included in the material exposed in X-ray or Radioisotope
PMI provides quickly over than 100 metal contents in alloy metal

DR/CR

DR(Digital Radiography) / CR(Computed Radiography)
DR and CR provide the higher quality image than the conventional film radiography in the lower radiation exposure
DR and CR omit developing process, so, there are used in emergency testing

Helium Leak Testing

This testing is a method detecting a leaked portion in system by using a helium gas is innoxuous, inertness, noncondensability and non-flammability, and not existed in atmosphere

Ammonia Leak Testing

Ammonia Testing uses the color change characteristics due to chemical reaction between Ammonia and Brom Phenol, and this method that examines the changed color at outside of product after Ammonia Gas is injected into the product
There is explosion limit of 16 ~ 27 % in the air, so it needs to handle with care

Infrared Testing

This method defects by analyzing and interpreting the collected images by mapping the temperature according to the infrared energy which is a kind of electromagnetic waves radiated from the product to be examined
In Korea, mainly used for examination of distribution facilities of electric power

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