Magnetostrictive Sensory System (MsS) Guided Wave Testing (GWT)

Magnetostrictive Sensory System (MsS) Guided Wave Testing (GWT) is a nondestructive inspection method that electromagnetically generates and receives low frequency ultrasonic guided waves. The system generates tone-burst omnidirectional electric pulses into probes and detects magnetic induction changes in the material, identifying areas of corrosion. The signal received from both directions of pipe are then analyzed and reported with data analysis and reporting software.


Click here to read our article, “Advancements in CUI Detection and Overview of MsS Guided Wave,” featured in the November/December 2016 Issue of Inspectioneering Journal.

MsS Guided Wave Testing provides rapid coverage for long-range areas, and is capable of detecting corrosion wall loss and cracks in aboveground, buried, and insulated piping, as well as pressure vessels and storage tanks. Because it provides rapid, expansive coverage, MsS Guided Wave can be used as a screening tool, identifying suspect areas of corrosion that will need to be further monitored and inspected.


1. Broad Frequency Range of 5kHz-250kHz

  • Full volumetric coverage
  • Rapid long-range pipe inspection with lower frequencies
  • Identification and assessment of pipe supports with use of higher frequencies (u-bolts, pipe supports and other geometric features have less effect on wave propagation, i.e. attenuation)
  • Increased nearfield resolution (dead zone length as low as 4″)
  • High signal-to-noise ratio

2. Convenience

  • Less than one inch clearance needed
  • Capable of inspecting pipe of all diameters (minimum of .25” outer diameter)
  • MsS probes can be attached with dry coupling, epoxy bonded, or ultrasonic shear couplant
  • Probe can be installed if more than 60 percent of pipe circumference is accessible
  • Ability to inspect in-service equipment (i.e. operating ability with temperatures up to 500°C)
  • Capable of detecting corrosion in piping, pressure vessels, and storage tanks

3. Reliable Findings & Reporting

  • Sensitivity can be as low as 1% cross-sectional wall loss in optimal conditions (but is set at .5 to 5% depending on distance from probe and pipe condition)
  • Remaining wall percentage of component/piping inspected is included in final report
  • Advanced detection software limits false calls (dynamic calibration software features)
  • Ability to differentiate defects and geometric features

4. Corrosion Under Insulation (CUI) Detection

  • CUI detection on both carbon and alloy materials
  • Large coverage area, with omnidirectional scans – removes need to strip main insulation
  • Ability to be installed as a permanent CUI monitoring system

5. Sectorial Scan Abilities

  • Spot corrosion inspection
  • Saddle support
  • Fire proofing
  • Elbows

6. Other Applications

  • Buried piping – i.e. soil to air interface
  • Tube exchangers
  • Crack detection
  • External Stress Corrosion Cracking (ESCC) on stainless steel
  • Vessel or Plate Monitoring

Interested in learning more? Reach out to us with your questions, or to schedule a demo!