Electromagnetic Acoustic Transducers, unlike conventional UT Transducers, create Ultrasonic energy through inducing an alternating current within a magnetic field. EMAT, as it is commonly referred to in our industry, is the application of Electromagnetic Acoustic Transducers to a scanner for the purpose of pipe screening. EMAT can be used on any piping that is physically accessible; dock lines, sleeper racks, and elevated piping.
Electromagnetic Acoustic Transducers have two probes: a pulser and a receiver. The pulser probe sends an Ultrasonic signal in both directions around the pipe circumference and the receiver receives the signals from both directions.
Changes in the sound path and time of flight of the UT signal represent changes in the material such as wall loss.
Benefits:
Rapidly scans piping, providing qualitative results and defect locations for further inspection.
Can detect small isolated defects, down to 1/8" diameter, as well as generalized wall loss from corrosion and/or erosion.
With traditional inspection techniques, pipe support interfaces has created a problem by the restricted means of access for data to be collected. Electromagnetic Acoustic Transducers do not require total access to gain the data needed for the inspection. They only need 1/3 of the line circumference to send full volumetric sound through the circumference of the pipe and provide accurate results
Can provide accurate information for support touch point inspections.
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How it works:
Electromagnetic Acoustic Transducers, unlike conventional UT Transducers, create Ultrasonic energy through inducing an alternating current within a magnetic field. EMAT, as it is commonly referred to in our industry, is the application of Electromagnetic Acoustic Transducers to a scanner for the purpose of pipe screening. EMAT can be used on any piping that is physically accessible; dock lines, sleeper racks, and elevated piping.