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Technology Application
LFET RFET BFET ECT Ultrasound OSET Support

TesTex uses a variety of state-of-the-art electromagnetic techniques to scan for defects in both ferrous and nonferrous materials and structures.


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LFET RFET BFET ECT Ultrasound OSET Support
Boiler Tubes AGS Tanks Pipelines Feedwater Heaters Heat Exchangers Finned Tubes Condensers Welds
Radio Field Electromagnetic Technique Triton RFET
Balance Field Electromagnetic Technique Triton BFET
Off Surface Electromagnetic Technique OSET - Scout
Ultrasonic Inspection Helix XT IRIS Echo 20/20

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RFET - system

The TesTex Eagle 2000 Multichannel RFET System is based on the principles of Remote Field Electromagnetic Technique (RFET). It is designed to quickly and accurately inspect ferrous tubing found in heat exchangers and drum-to-drum boiler generating banks. Inspections using RFET are conducted from the tube ID (inner diameter).Other applications include air cooler fins and fans, tubular air heaters, and certain types of short-run plant piping. The Eagle 2000 uses RFET probes that have eight (8) sensors equally spaced around the probe’s circumference (smaller diameters may have four or six sensors). Eight sensors allow real time, 3-D, color graphic display showing the tube circumference as if the tube were split open and laid flat. Because these discreet pick-up sensors are very small–only a few millimeters in diameter–they have higher resolution and greater detection capabilities for small flaws such as pitting. All data can be imported into the 3-D Tube Sheet Mapping Software for an overall visual of the equipment being tested.

The Eagle 2000 detects and quantifies flaws such as baffle cutting and fret wear, erosion and corrosion, pitting, soot blower thinning, flue gas erosion, and steam impingement.
Cracking is also detectable with suitable adjustments to the pick-up coil configuration and proper calibration.

Report Excerpts:

Tubesheet mapwaveform

Advantages over Competing Technologies

Other inspections methods for carbon steel tubing are internal rotating inspection system ultrasound (IRIS UT) and magnetic flux leakage (MFL).

The IRIS UT method requires extensive tube cleaning for the technology to work because the ultrasonic signal does not easily penetrate through oxides, scale, deposits, or debris. If the tube’s ID surface can be cleaned down to near bare metal finish, the IRIS UT technique can be successfully applied. TesTex does offer IRIS UT inspections as a service.Magnetic flux leakage testing also requires substantial tube cleaning because the flux leakage probe needs to have a good “fill-factor” (snug fit) compared to the tube’s ID. Because the MFL employs magnets in the probe heads, the probes collect any magnetic deposits that are remain in the tube. While the IRIS UT method has very good flaw quantification capabilities, the MFL method is less quantitative and more qualitative. The TesTex Eagle 2000 Multichannel System does not require extensive tube cleaning because the RFET system allows for usage of probes that do not need a tight fill-factor compared to the tube’s ID. RFET probes do not use any permanent or electro-magnets; therefore, the RFET probe heads do not collect any magnetic deposits or debris. The TesTex Eagle 2000 Multichannel System is quantitative with usage of the proper calibration standards.


  • Real Time 3-D Color Graphic Displays for Data Acquisition and Data Analysis/Display
  • Inspects Straight Sections and Bends; U-Bends can be inspected with special probes
  • 300-400 tubes average productivity of one system in a 10 – 12 hour shifts
  • Inspects through scale on the ID or OD
  • Probe Fill Factor not critical to operations
  • Numerous Signal Processing Algorithms available for Data Analysis
  • Windows Based Software
  • Small, Lightweight, Modular, PC Based Design
  • 110/220V Operation
  • Probe sizes range from 0.320 inches (8.1mm) to 6 inches (152mm)
  • Low Signal to Noise Ratio
  • Probe lengths of up to 150 feet without signal pre-amplification
  • System Frequency Range of 5Hz to 30KHz. (lower frequencies are critical for the inspection of thicker walled Carbon Steel tubing and Air Cooler – Fin/Fans)

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