Earlier this year during a condenser eddy current exam, we encountered several tubes with extremely noisy data in various spots in the tube. Also within these nosy areas, we also saw crack like signals indicating that this wasn’t just noisy data, there was some sort of metallurgical change present in the tube. We had a tube sample extracted and performed a detailed analysis of one of the suspected area. What was discovered is that these areas were dezincification on the ID surface of the tube. Continue reading “Dezincification In Admiralty Brass Tubing”
Recently a customer of ours was experiencing several tube leaks in their feedwater heaters. Upon arrival a preliminary walk down of the heater (vertical) didn’t show any abnormal conditions or indicators as for the reason for problems, so a 100% eddy current inspection was performed.
This past spring, one of our customers requested an eddy current exam to determine the cause of some recent condenser tube leaks. An eddy current test was performed on a predetermined scope of 25% on both water boxes. Continue reading “Microbiologically Induced Corrosion”