By Reggie Cross
at ND Tech.
This article appears in the September/October 1999 issue of Inspectioneering Journal
This paper describes use of a UT fixture for detection of stress corrosion cracking in ferrous heat exchanger tube-to-tubesheet welds and external tube corrosion or pitting near the tubesheets including crevice OD corrosion of the tube in the tubesheets.
A study of means for locating the source of exchanger shell to tube-side leaks in the water treatment section in a fertilizer plant (1) was undertaken. An effective UT inspection technique was developed, as a result.
Fig.1 pictures the fixture being tested in a mockup of a portion of the exchanger tubesheet
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