- Internal rotary inspection system
Internal rotary inspection system (IRIS) is an ultrasonic method for the
nondestructive testingof pipes and tubes. The IRIS probe is inserted into a tube that is flooded with water, and the probe is pulled out slowly as the data is displayed and recorded. The ultrasonic beam allows detection of metal loss from the inside and outside of the tube wall.
Principle of operation
The IRIS probe consists of a rotating mirror that directs the ultrasonic beam into the tube wall. The mirror is driven by a small turbine that is rotated by the pressure of water being pumped in. As the probe is pulled the spinning motion of the mirror results in a helical scan path.
*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 testingdue 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
*Typical smallest detectable defect: through-hole of diameter 1/16-inch (1.6 mm).
*Operates in temperatures above freezing.
*Can pass bends, but will not detect defects in bends.
*Not sensitive to cracks aligned with tube radius.
*IRIS testing world wide. [http://www.DCI-meettechniek.nl PDF]
*"Tubing Inspection using Multiple NDT Techniques". By Fathi E. Al-Qadeeb. [http://www.ndt.net/article/mendt2005/pdf/p18.pdf PDF] , 118 kB.
*"Condition Monitoring - Process Plant Tube Inspection: an Ongoing Commitment by Plant Owners and Operators." By Charles Panos. [http://www.ndt.net/apcndt2001/papers/7/7.htm]
*"NDT and Heat Exchanger Tubes." By Helle H. Rasmussen, Hans Kristensen & Leif Jeppesen. [http://www.ndt.net/article/ecndt98/chemical/117/117.htm]
Wikimedia Foundation. 2010.
Look at other dictionaries:
Tire-pressure monitoring system — A tire pressure monitoring system (TPMS) is an electronic system designed to monitor the air pressure inside the pneumatic tires on various types of vehicles. The system is also sometimes referred to as a tire pressure indication system (TPIS).… … Wikipedia
Nondestructive testing — or Non destructive testing (NDT) is a wide group of analysis techniques used in science and industry to evaluate the properties of a material, component or system without causing damage. The terms Nondestructive examination (NDE),… … Wikipedia
Ultrasonic testing — Step 1 : The UT probe is placed on the root of the blades to be inspected with the help of a special borescope tool (video probe). Step 2 : Instrument settings are input. Step 3 : The probe is scanned over the blade root. In this case, an… … Wikipedia
Tubular NDT — (nondestructive testing) is the application of various technologies to detect anomalies such as corrosion and manufacturing defects in metallic tubes. Tubing can be found in such equipment as boilers and heat exchangers. To carry out an… … Wikipedia
IRIS — can refer to: In technology * IRIS T, a German air to air missile * International Reactor Innovative and Secure, an advanced light water nuclear reactor design * Internal Rotary Inspection System, an ultrasonic method for the nondestructive… … Wikipedia
Remote field testing — (RFT) is an electromagnetic method of nondestructive testing whose main application is finding defects in steel pipes and tubes. RFT may also referred to as RFEC (remote field eddy current) or RFET (remote field electromagnetic technique). An RFT … Wikipedia
вращающаяся система для контроля внутренних поверхностей труб — — [А.С.Гольдберг. Англо русский энергетический словарь. 2006 г.] Тематики энергетика в целом EN internal rotary inspection system … Справочник технического переводчика
Screw thread — Internal and external threads illustrated using a common nut and bolt. The screw and nut pair can be used to convert torque into linear force. As the screw (or bolt) is rotated, the screw moves along its axis through the fixed nut, or the non… … Wikipedia
List of oil field acronyms — Contents 1 # 2 A 3 B 4 C … Wikipedia
steel — steellike, adj. /steel/, n. 1. any of various modified forms of iron, artificially produced, having a carbon content less than that of pig iron and more than that of wrought iron, and having qualities of hardness, elasticity, and strength varying … Universalium