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Electromagnetic Acoustic Transducer (EMAT)

Bringing greater detection capability to piping inspection

Electromagnetic acoustic transducer (EMAT) evaluation relies on the use of ultrasonic energy to induce an alternating current within a magnetic field. EMAT testers typically employ two probes. The pulser probe sends an ultrasonic signal in both directions around the circumference of a pipe under examination, and the receiver probe receives signals from both directions. Changes in the sound path and time of flight of the ultrasonic signal indicate changes in the material, such as wall loss.

EMAT evaluation can be used on any piping that is physically accessible, including elevated piping, dock lines and sleeper racks. EMAT evaluation can also be used with both above and below ground storage tanks, fiberglass structures and rotating machinery.

The advantages of EMTA evaluation include:

  • Allows for the rapid scanning of long piping runs to identify locations of possible defects for further inspection and evaluation;
  • Can detect isolated defects as small as 1/8” in diameter, as well as generalized wall loss from corrosion and/or erosion:
  • The technology does not require total access to access the data needed for inspection. Instead, access to only one third of the line circumference is required to send full volumetric sound through the pipe;
  • Provides accurate information for support touch point inspections.

Why choose TÜV SÜD?

TÜV SÜD America, Chemical, Oil and Gas is a leading provider of conventional and advanced nondestructive testing services. Our technicians are fully trained and independently certified to conduct EMAT evaluations, as well as other nondestructive evaluation techniques. Our mechanical integrity program is recognized as the standard in the petrochemical industry. TÜV SÜD laboratories and testing facilities can perform quality inspections on almost any form of ferrous material, component or product assembly. Finally, our inspectors are certified to the American Society of Nondestructive Testing (ASNT) Level III and Level II requirements.

TÜV SÜD America, Chemical, Oil and Gas has been synonymous with quality inspection services in the energy and chemical industries for more than 30 years. We’re part of the global network of TÜV SÜD AG, and have access to a complete range of product testing, certification and audit services. From unbundled risk evaluations to management systems and product testing, we deliver what other inspection companies cannot.


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