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Internal Rotary Ultrasound (IRIS)
Turn your Heat Exchangers, Inside - Out
The IRIS 9000 system from our principal company M/s Iris Inspection Services Inc., USA, representing the sixth generation version now, has always been the industry standard for internal rotary ultrasonic examination of heat exchangers. A centered testhead which moves inside the heat exchanger tubes is fitted with an ultrasonic transducer, which is used on pulse-echo immersion technique. The transmission of ultrasound energy is along the tube axis; however they are reflected by a rotating 45 deg mirror and directed radially on to the tube wall. The reflected energy from the inner and the outer tube walls is received back by the probe. The time interval difference from the outer wall of the tube to the inner wall of the tube represents the actual wall thickness.
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As the mirror rotates, the ultrasonic beam is traversed around the tube circumference and each successive pulse is mapped out as a horizontal scan line on the screen of the IRIS 9000. There are 192 readings per revolution and 2400 revolutions per minute. The probe is advanced by an encoded drive motor in the tube at an optimum inspection speed of 2.54 m/min and this speed ensures 100% coverage of the tube. The IRIS 9000 can accurately measure internal and external corrosion and pitting, categorize the type as well as location of wall loss, and documents all results for future references. It is self calibrating, extremely accurate and inspects a wide tube range ID size from 8.6 mm (0.34") to 88.9 mm (3.5") upto 30 m in length.
The IRIS 9000 can inspect typically about 200 tubes in a day (8 hr shift) and the only pre-requisite is thorough cleaning of the tube bore by hydroblasting. This technique is comparatively quantitative, can inspect both ferromagnetic as well as no-ferromagnetic tubes and the inspection is not hindered by the locations of baffles, stiffeners, tube sheets, fins etc in the heat exchangers.