O2 pitting locations
O2 pitting locations
(OP)
"The most severe damage occurs at the economizer inlet and, when present, at the tube weld seams. Where economizers are installed, effective deaerating heater operation is absolutely essential. The application of a fast-acting oxygen scavenger, such as catalyzed sodium sulfite, also helps protect this vital part of the boiler."
This is from GE water.
Why is oxygen pitting most prevalent in the economizer inlet and not the rest of the economizer. I realize that it boils out of solution at this point, but wouldn't the oxygen still eat away at the tops of the tubes throughout?
This is from GE water.
Why is oxygen pitting most prevalent in the economizer inlet and not the rest of the economizer. I realize that it boils out of solution at this point, but wouldn't the oxygen still eat away at the tops of the tubes throughout?
-Mike





RE: O2 pitting locations
I have always found oxygen induced pitting in the DA storage tank, on the tank heads, below the water line.
This pitting is especially prevalent in systems that are shut down frequently and with ancient, partially functioning Deaerators.
Ohhhh.....There is also usually a brand-new, 23 year old boiler plant operator standing in the corner......holding a schematic drawing upside down.
-MJC
RE: O2 pitting locations
Simples!
Adam Potter MEng CEng MIMechE
www.ax-ea.co.uk
RE: O2 pitting locations
-Mike