Nondestructive Testing, (NDT)

Non-destructive testing is used to detect discontinuities such as crack, corrosion, or manufacturing defects without damaging their future usefulness. NDT is applied to all stages of the production process from raw material, fabrication process, finished product, and also after service. NDT is an essential element for quality control of the product, particularly for pressure vessel, process equipment, piping, and steel structure.

NDT uses principles of physics such as radiation, light, sound wave, magnetic, and electric energy to evaluate properties of material and component. Each method has its own advantages and limitations based on its capability, sensitivity, and cost.

Basic Nondestructive Testing Methods

• Visual Testing, VT
• Radiographic Testing, RT
• Ultrasonic Testing, UT
• Magnetic Particle Testing, MT
• Penetrant Testing, PT

Advance Nondestructive Testing Methods

• Eddy Current Testing, ET
• Computed Radiographic Test, CR
• Phased Array UT, PAUT
• Time of Flight Diffraction, TOFD
• Acoustic Emission Testing, AET
• Thermal Infrared Testing, TIR
• Alternating Current Field Measurement, ACFM
• Tank Floor Scan, TFS

Other Nondestructive Testing Methods

• Hydrostatic Test / Leak Test
• Holiday Test/test on a protective coating to detect unacceptable discontinuities.