LFET – Low Frequency Electromagnetic Technique for Boiler wall tubes testing

Low Frequency Electromagnetic Technique also commonly referred as LFET is one of the electromagnetic testing methods utilized effectively for the inspection and assessment of Boiler Wall tubes.

Low Frequency Electromagnetic Technique - LFET is a non-destructive corrosion assessment method for condition monitoring of Boiler Wall tubes. As the name suggests, Low Frequency Electromagnetic Technique – LFET utilizes low frequency electromagnetic energy to test Boiler Wall tubes.

Low Frequency Electromagnetic Technique – LFET instrumentation used for Boiler Wall tubes testing comprises a special purpose contoured (to match tube circumference) manual scanner, test equipment and a custom software for live detection of flaws.

The Low Frequency Electromagnetic Technique - LFET method is:
Fast, Accurate, Traceable, and Archivable a digital paper trail

low frequency electromagnetic technique tracable ndt method

A low frequency electromagnetic field in induced into the boiler wall tube material using an external horseshoe shaped electromagnet. Any flaw in the path of the magnetic field distorts the magnetic flux which is detected by the array of sensors. The severity of a discontinuity is measured by analyzing a Phase / Amplitude plane graph with the aid of a custom purpose software.

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Although Short Range Ultrasonic testing – SRUT is a screening technique used on wall thickness range of 6 to 25mm, this test method can locate the discontinuity location and size to an accuracy of ±10%. SRUT can detect discontinuities such as corrosion, pitting & erosion. Generally detected discontinuities are reported in the percentage remaining wall thickness and categorized into various severity level.

Ideal Applications:

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  • Boiler & Economiser water wall tubes
  • Detection of localized pitting in rifled boiler tubes
  • Detection of caustic gauging on water wall tubes
  • Detection of Hydrogen damage on boiler water wall tubes

Advantages:

  • Effective corrosion assessment method as compared to Visual and Ultrasonic test
  • Detect discontinuities on both the OD and the ID side of the boiler wall tube
  • Scanning of 100% of the boiler wall tube surface
  • Low Frequency Electromagnetic Technique - LFET is very fast scanning method as compared to Ultrasonic or radiographic test method on boiler water wall tubes
  • Detect discontinuities while scanning of boiler tubes.

Limitations:
Discontinuities detected by Low Frequency Electromagnetic Technique – require further testing by ultrasonic testing for measuring precise wall thickness.

Expertise:
Compared to conventional ultrasonic testing, Low Frequency Electromagnetic Technique - LFET for boiler water wall tubes testing instrument and sensors are complex and expensive. This test method requires highly trained, skilled and experienced technicians.

LMATS engages certified and experienced engineers to provide Low Frequency Electromagnetic Technique - LFET for boiler water wall tubes testing

LMATS offers LFET – Low Frequency Electromagnetic Technique  inspections from our Melbourne, Sydney, Brisbane, Albury, Malaysia and India laboratories.
LMATS regularly performs LFET – Low Frequency Electromagnetic Technique testing in VIC -Victoria, NSW - New SouthWales, QLD - Queesnland, QLD - Brisbane, SA - South Australia, TAS - Tasmania, NT -Northern Territory, WA - Western Australia and some of the countries aroung the world.

To find out more about LMATS LFET – Low Frequency Electromagnetic Technique Advanced NDT Tracable Inspection and testing Capabilities simply call us or contact us +61 3 9399 8145 or via the form

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