Immersion Ultrasonic Testing

Immersion Ultrasonic Testing


IRIS is an ultrasonic method to detect discontinuities in pipes and tubes.

In oil and gas industries and power plants many operators face a challenge regarding maximizing the efficiency and life expectancy of the equipments without having any adverse effect in safety and reliability. Hence it is really important that accurate inspection is carried out of vital components such as pipes and tubes is crucial for smooth running of plant.
IRIS (Internal rotary inspection system) can detect discontinuities such as corrosion, pitting, erosion, in various devices such as tubes in boilers, heat exchangers, air coolers, feed water heaters. Hence the biggest advantage being the variety of uses as it can be used on materials that are ferrous and non-ferrous with wide range of tube diameters and thickness.  
An IRIS probe is flooded with water. This probe has housing of an ultrasonic crystal along axis of the tube. There is a rotating mirror which directs ultrasonic waves in tube wall. This mirror is rotated by a small turbine which is rotated by water pressure in pipes.
The ultrasound sound is reflected form inner-diameter (ID) wall and outer-diameter (OD) of tube wall and the time of flight difference (TOFD) between the two diameters is used to measure the wall’s thickness.
As probe is pulled, the spinning of the mirror results in a helical scan that helps in complete scan of tube.
Benefits of using IRIS include:

  • Suitable for most materials such as ferrous and non-ferrous.
  • Accurate thickness measurements of wall.
  • Detection of corrosion, pitting and wall loss.
  • Both internal and external defects can be detected.
  • Defect position can be located relative to tube’s length.
  • Full coverage of the tube.
  • Data of result can be stored.

Our inspectors have years of experience using IRIS and TOFD systems as they can provide you with an accurate assessment of the condition of your equipments and systems.

Immersion Ultrasonic Testing (UT) is used for the detection of internal discontinuities and defects.

Immersion ultrasonic testing, a type of advanced ultrasonic testing (UT), it is more effective than manual testing it offers better probability of detection of small defects and it does provide you with accurate reporting of the defect size, location of subsurface discontinuities in materials.      
In the highly precise field of immersion ultrasonic testing, ANDT uses the latest in semi-automated and fully automated inspection systems. Our NDT inspectors are ASNT level 2 and 3 qualified, and are highly experienced in using immersion ultrasonic testing technique.
ANDT specializes in using immersion ultrasonic testing for the pipe fittings, aerospace, power industries, automobile sectors to inspect various materials and components. However, the technique is also suitable for use in many other industrial and manufacturing sectors.
Usually in ultrasonic testing a couplent is applied between transducer and the test object such as oil, water, gel, and glycerin then probe is manually moved on the surface. With immersion testing part is submerged in water or any other suitable liquid this allowes better sound travel while maintaining constant distance between probe and test piece. We can provide real time and post scan data and provide ’A’, ‘B’, ‘C’ scan. This allows us to detect discontinuities to most demanding industrial standards.
ANDT’s immersion ultrasonic testing can help you in ensuring the safety and reliability of the components, this helps our customers to follow most stringent industrial standards. Our