I went to see a job on Friday where the person put in a new cast iron boiler about 3 years ago. There are a few fittings that are coroding and there is leakage. please see photos. There is a 6" black nipple coming out of top of boiler which goes into a steam tee then another nipple which screws into a taco pump. you could see the green color in photo _001. Out of the tee is screwed in a line voltage mcdonald miller low water cut off. I was hoping someone could tell me why the pipes are coroding. looks to me like there are metals interacting but its all iron to iron. I thing the low water cut off has brass in it on the probe, but that isn't suppossed to touch the wall of pipe. I don't want to replace the bad fittings and for it to just happen again.
No announcement yet.
can someone tell me what caused this pipe corrosion?