Wspólnotowy Serwis Informacyjny Badan i Rozwoju - CORDIS

Oxide thickness measurements to estimate tube temperatures

The thickness of oxide on the inside of ferritic boiler tubes can now be determined by ultrasonic measurements made from the outside of the tubes. The thickness can be used to estimate an average tube metal temperature if the time of exposure is known. The accuracy and sensitivity of the technique depends on the ultrasonic instrument and probe used, and a detailed knowledge of the properties of the oxide. Several commercial systems are now available with no public details of the basis of the results, but the system available from this project is based on a much more detailed understanding of the processes involved which is used openly to justify the results. It is considered that additional detailed long term data are needed to further substantiate the technique, and also to consider different methods of measuring the oxide thickness, which would further advance the value of the technique.

Reported by

ERA Technology Ltd.
Cleeve Road
KT22 7SA Leatherhead - Surrey
United Kingdom
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