Advanced NDTNon Destructive Testing (NDT)

Internal Rotating Inspection System (IRIS)



  •  Based on the ultrasonic immersion testing principle.
  • Ultrasonic sound wave is generated from a concave probe and transmitted into the 45° mirror mounted in a turbine, which reflect the sound wave to the tube wall.
  • Pressurized water is being used as couplant  and rotates the turbine.
  • While the turbine rotates, it collects data around the 360° circumference of the tube.
  • Measures exact remaining wall thickness and also online C-Scan presentation.
  • C-Scan is helpful to identify the thickness variation immediately.


  • Only technique that gives exact tube wall thickness.
  • Provide information on flaw profile: either ID flaw or OD flaw.
  • With real-time C-scan capabilities during data collection.


  • Provide data of full length of a tube.
  • Provide report in exact remaining wall thickness
  • Identify the type of flaw indication such as localized wall loss, gradual corrosion and pitting.
  • Indication of OD flaw or ID flaw.

Application of IRIS

  • Generally for inspection of heat exchanger, boiler tubes and pipe lines for measurement of wall thinning and pitting due to corrosion.
  • Able to indicate the reduction in wall thickness taking place either in an outer diameter or inner diameter or from both sides.
  • It reveals both uniform corrosion and localized pitting corrosion.
  • Can inspect tube wall thickness from 0.8mm.
  • Can inspect 100 – 150 tubes per day depends on the tubes condition.
  • Pulling speed is 0.3m/s