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PENETRANT TESTING/ DYE PENETRANT INSPECTION (DPI)
Penetrant testing is an NDT method that work with the principle of capillary action for detection of surface breaking defects or flaws in all types of materials except from excessive porous material. Steps to PT 1. Pre-cleaning 2. Application of penetrant 3. Dwell time or contact time ( a crucial time it’s takes for the liquid penetrant to remain on the surface of the part) 4. Removal of the excess penetrant 5. Application of developer 6. Inspection 7. Post cleaning
PENETRANT TESTING/ DYE PENETRANT INSPECTION (DPI)
Penetrant testing is an NDT method that work with the principle of capillary action for detection of surface breaking defects or flaws in all types of materials except from excessive porous material. Steps to PT 1. Pre-cleaning 2. Application of penetrant 3. Dwell time or contact time ( a crucial time it’s takes for the liquid penetrant to remain on the surface of the part) 4. Removal of the excess penetrant 5. Application of developer 6. Inspection 7. Post cleaning
ULTRASONIC TESTING
The principle of ultrasonic testing is mismatch of acoustic impedance (Z) Ultrasonic testing is the use of ultrasound (sound with frequency above 20KHz) to detect flaws present inside the material.. Types of waveform 1. Compressional/longitudinal wave. It is Basically for thickness measurement ( corrosion and lamination check).. it is the use of zero degree probe or normal probe. It travels with a velocity of 5960m/s in steel material 2. Shear wave/Transverse wave: it is a wave whereby the propagation of sound is perpendicular to the vibration of particles. It travels at 3 different standards angels (45, 60, 70).. the sound travels at a velocity of 3200- 3250m/s 3. Surface / Rayleigh Wave 4. Plate/ Lamb Wave
ULTRASONIC TESTING
The principle of ultrasonic testing is mismatch of acoustic impedance (Z) Ultrasonic testing is the use of ultrasound (sound with frequency above 20KHz) to detect flaws present inside the material.. Types of waveform 1. Compressional/longitudinal wave. It is Basically for thickness measurement ( corrosion and lamination check).. it is the use of zero degree probe or normal probe. It travels with a velocity of 5960m/s in steel material 2. Shear wave/Transverse wave: it is a wave whereby the propagation of sound is perpendicular to the vibration of particles. It travels at 3 different standards angels (45, 60, 70).. the sound travels at a velocity of 3200- 3250m/s 3. Surface / Rayleigh Wave 4. Plate/ Lamb Wave
MAGNETIC PARTICLE INSPECTION
A longitudinal crack detected on weld. Steps to Magnetic Particle Inspection (MPI) 1. Pre cleaning 2. Application of white contrast paint 3. Magnetization of the part to create magnetic field. 4. Application of magnetic particle (black ink) 5. Inspection to observe any indications of flaws (e.g crack, lack of fusion) 6. Post cleaning Note: spraying of magnetic particle whilst the current is flowing, is called “Continuous Method” while spraying of particles after the current has been removed is called “Residual Method”. The most effective method here is the Continuous method..
MAGNETIC PARTICLE INSPECTION
A longitudinal crack detected on weld. Steps to Magnetic Particle Inspection (MPI) 1. Pre cleaning 2. Application of white contrast paint 3. Magnetization of the part to create magnetic field. 4. Application of magnetic particle (black ink) 5. Inspection to observe any indications of flaws (e.g crack, lack of fusion) 6. Post cleaning Note: spraying of magnetic particle whilst the current is flowing, is called “Continuous Method” while spraying of particles after the current has been removed is called “Residual Method”. The most effective method here is the Continuous method..
Critical inspection
Ultrasonic flaw detection on column of a Preheater at Dangote Cement Factory at Ogun State
Critical inspection
Ultrasonic flaw detection on column of a Preheater at Dangote Cement Factory at Ogun State
