|Posted by plumbcrazy on March 15, 2004 at 12:42:58:|
|In response to Re: Dielectric Nipples, how important?|
Use the dielectric nipples. Dielectric unions or nipples are only a few dollars each.
If you do not use dielectric fittings, in time (couple years / decades, who knows) the connections will start to fail. Usually at the thinnest point, the threads. You will start to see a rust build up around the nipple entering the cast iron threaded boss or the steel nipple coming form the radiator. Eventually it will leak worse and worse.
Connections between dissimilar metals without the use of dielectric fittings will produce galvanic corrosion (often called electrolysis). Metals have potential and each type of metal has a different potential (potential is measured in volts). When you make a connection between two or more dissimilar metals you create a potential difference. Now just introduce an Electrolyte (water) and you've created a very weak battery.
: I'm installing some cast iron radiators in a new addition we built, I'll be connecting the radiators to 3/4" copper tubing. How important would the use of dielectric nipples be in the connection? If not used, what can I expect?
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