• Internal Rotary Inspection (IRIS)

  features of IRIS

  Posted by jackson on 14/10/2021 at 10:48 pm

  features of IRIS
  • Field-proven and commonly used in boilers, heat exchangers, and fin-fan tubes.
  • Often used as a back-up to electromagnetic examination of tubes, to verify calibration and accuracy. Especially useful as a follow-up to remote field testing due to the full sensitivity near tube support structures provided by IRIS.
  • The IRIS probe must be moved very slowly (approximately 1 inch per second, or 2.5 cm/s), but it produces very accurate results (wall thickness measurements typically accurate to within 0.005 inch, or 0.13 mm).
  • Before the examination, tubes must be cleaned on the inside to bare metal.
  • A supply of clean water is needed, typically at a pressure of 60 psi, or 0.4 MPa. Dirt or debris in the water may cause the turbine to jam.
  • Works for tube diameters of ½ inch (13 mm) and up. Special centralizing devices are needed for larger diameters.
  • Works in metal or plastic tubes.
  • Through-holes are difficult to detect by using this method.
  • Operates at temperatures above freezing.
  • Can pass bends, but will not detect defects in bends.
  • Not sensitive to cracks aligned with tube radius.

  jackson replied 3 years, 6 months ago 1 Member · 0 Replies
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