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NDT.net Issue - 2018-06 - NEWS

Lamp posts inspection with EMAT Medium-Range Guided Waves


Innerspec Technologies14, Lynchburg, Virginia [USA]
NEWS  
NDT.net Journal
Issue: 2018-06
Corrosion detection becomes especially challenging when a section of the object being inspected is buried, covered, or coated, as the frequent presence of moisture and chemicals in the non-accessible areas can aggravate the degradation process. Due to that reason the investigation of inaccessible areas e.g. lamp posts inspection becomes a matter of vital importance. The loss in metal thickness caused by corrosion can cause sudden failure and significant damage to people and surrounding property.


Lamp post fallen on car (Image: Robin Dosanjh)


Lamp post corroded (Image: Robin Dosanjh)

While wall loss thickness measurement is an efficient way of pole corrosion detection on the exposed areas, this is not possible when direct access to the wall of the pole is not an option. Medium-Range EMAT Guided Waves traveling in the axial direction are presented as a solution to detect and localize corrosion in exposed and buried, non-accessible sections of the lamp posts.

Innerspec Technologies has recently developed the MRUT MS Scanner to improve lamp posts inspection in buried areas as well as the inspection of pipes and other structures using Shear Horizontal guided waves generated with a magnetostrictive strip. This novel and patented technique permits inspection of inaccessible areas with an unprecedented degree of sensitivity and resolution.

MAGNETOSTRICTIVE TRANSDUCERS

The magnetostrictive effect has been successfully used for generation and measurement of guided waves for decades. The static magnetic field is induced by pre-magnetization (rubbing the strip with a permanent magnet). By adhering the magnetostrictive strip to the part inspected, the transduction efficiency of the strip permits efficient generation of guided waves.

MRUT MS SCANNER

The MRUT MS (magnetostrictive) Scanner is the most appropriate tool for defect detection under supports, buried structures, and other non-accessible areas such as pole corrosion detection.


MRUT MS Scanner placed on a pipe - Circumferential scanning sending the waves both sides in the axial direction

The magnetostrictive strip can be adhered permanently if the aim is to monitor the structure regularly, or temporarily for one-time inspections.


Lamp post inspection using Innerspec PowerBox H and MRUT MS Scanner

The MRUT MS Scanner has a dead zone of 10-15 cm which permits performing the inspection in very close proximity to the area of interest. Moreover, by inspecting closer to the defects and higher frequencies, the detection and resolution are typically 10 times better than with Long-Range UT techniques.

CORROSION DETECTION OF NON-ACCESSIBLE AREAS

MRUT MS Scanner works with sections buried in soil and concrete giving similar detection results with the post exposed to the air. Following images show the inspection results of the defects in different sizes on the same post in 3 different scenarios.

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The data was collected with Innerspec PowerBox H along with the MRUT MS Scanner.

The patented MRUT MS Scanner is the newest addition to Innerspec’s MRUT toolkit, which offers the most complete selection of sensors and accessories for Medium-Range Guided Waves inspection in the market.

Learn more about Innerspec’s applications for inspection of inaccessible areas from side.

Innerspec Technologies

More of Innerspec Technologies published in NDT.net
2018-11-01: Innerspec launches new line of Ultrasonic Thickness Gauges without contact and couplant
2018-08-01: New EMAT solutions for the railway industry
2018-08-01: Inspection of lamp posts and other inaccessible areas with EMAT Medium Range Guided Waves
2018-08-01: New technique for ultrasonic inspection of multi-pass welds with EMAT guided waves
2018-08-01: Innerspec Technologies Europe opens new facilities
2018-03-01: Residual stress measurement in train wheels with Innerspec PowerBox H
2018-01-01: NDT powerhouses, Innerspec and Tecnatom, launch new consulting, training, and inspection support services venture, Farfield NDT
2017-06-01: In-service application of EMAT in Boiler Water Wall Tubes and High Temperature Components
2016-07-01: Corrosion detection under pipe supports using EMAT Medium Range Guided Waves
2016-07-01: Handheld Solution for Measurement of Residual Stresses on Railway Wheels using EMATs
All 16 Articles & News of Innerspec Technologies in NDT.net


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