Re: Replacing shut off valve on the water main line
Posted by iGreg on 2017/9/14 12:20:09
iGreg, I was told the closed system nature of steam didn't allow in the oxygen needed for rusting, which is why we have these 100 year old systems and radiators instead of piles of rust.
Steam is moisture and moisture causes rust, there is plenty of air inside those old pipes that would certainly constitute enough oxygen (and in fact does).
Peek inside the level sitting pipes and you'll see - there are often capped ends in the older systems allowing for access.
Those ancient cast iron radiators can be flushed out for more efficiency as well (years of crappy sediment inside) - replacing them with those neat smaller units is in fact quite nice but exceptionally expensive to have done correctly.
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