Cita: Laboratory analysis of a cracked area would confirm SCC. However, it may be difficult to distinguish between caustic SCC and chloride SCC based on the crack morphology. Caustic SCC tends to be intergranular, while chloride SCC is typically transgranular and more branched. Wiith MIC activity, I would expect to see deposits. If you have deposits, and can sample them, you might be able to observe the microbes at high magnification. Alternatively, collect a sample of condensate and see if you can grow microbes in a culture. Hope this helps! David Hendrix The Hendrix Group Inc.

Mr Hendix, thank you for your sharing knowledge. I planned to replace it to 316L, but I found from a chart taken from a book, it desbribes that connecting 304L to 316L will cause one of the material corroded. I don't want to make the spool become cathode to other 304L material and cause other area of 304 pipe can be corroded. Therefore, I don't make that point as a suggestion. Regards, Cita

Mr. Hendrix, Thank You. Regards, Ms. Cita