NDT - Phils., Inspection Services Corporation

• Based on the ultrasonic immersion testing principle.
• • Ultrasonic sound wave is generated from a concave probeand 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.

ADVANTAGES

• 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.

RESULTS

• 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