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Nondestructive Evaluation


Cladding Thickness Sensor


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A magnetic sensor was developed by Southwest Research Institute (SwRI) to measure stainless steel cladding thickness. Applications include:

  • Clad pressure vessels used in nuclear reactors

  • Petrochemical plants

  • Paper mills

According to ASME Section XI, evaluation of flaw acceptability requires that the depth of the flaw into the base metal be determined. Ultrasonic inspection measures only the total flaw depth from the examination surface; however, the needed base metal depth can be found by subtracting the thickness measured by the clad sensor.


The sensor can be used for manual measurements or can be incorporated into a mechanized scanning system with automated data acquisition system. The sensor was used successfully during an in-service inspection of a commercial nuclear reactor pressure vessel using the SwRI EDAS® system.


The system has also been used to inspect petrochemical vessels. Sensors can be configured in various sizes to accommodate accessibility requirements.


For more information about our nondestructive evaluation (NDE) capabilities, cladding thickness sensor technology, or how you can contract with SwRI, please contact Jay Fisher, Ph.D., at or (210) 522-2028.


Contact Information

Jay Fisher, Ph.D.


(210) 522-2028

Related Terminology

cladding thickness

computer modeling



eddy current

magnetic sensor

nondestructive evaluation

orientation sensing

pipe wall thinning

position sensing

pulsed eddy current

reliability studies

specialized NDE system development

specialized procedure development

steel pipe inspection

| Sensor Systems and Nondestructive Evaluation (NDE) Technology Department | Mechanical Engineering Division | SwRI Home |

Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 9 technical divisions.

August 07, 2014