Hi Everyone.
I have a central boiler cl5036 that was installed in the fall of 2011 to replace an older wood boiler (cant remember what it was) where the top of the tank had rusted off of it. I am running glycol in the system with rust inhibitors and regularly test the glycol for ph (it is between 8 and 9) and nitrite levels. I have added 1 gallon of molydbate (as recommended by my local plumbing supplier) and have added a small amount of central boiler rust inhibitor to keep the nitrite levels up. I have even taken a glycol sample in a glass jar, added a piece of steel wool and left it to see if any rust forms on the steel wool (which it doesn't). I am confident that my actions are keeping corrosion away below the top of the glycol level in the furnace.
The other day I looked down the fill tube on the top of the boiler with a flashlight and noticed there was a bit of corrosion on the inside of the fill tube. This leads me to believe that there is probably corrosion also on the top of the inside of the tank ABOVE the glycol level. Now I am worried that I will end up with the same problem as the old wood boiler where the top of the tank rusts away to nothing. Is there anything that can be done to prevent this? My glycol level is just slightly above the full mark. When I look down the fill tube the glycol level is a couple inches below the fill tube so obviously there is an air space at the top of the tank. What can I do to stop any rust??
Thanks!
Dean
Author
Topic: Corrosion (Read 943 times)