Posted by Bud..Suncoast Plumbing Inc. on November 29, 1998 at 17:01:25:
In response to Re: DIELECTRIC UNIONS
Bill:--hj reflects my sentiment on the subject to a "Tee". Each bi-metallic joint (junction) acts just like a battery when in the presence of water even if there is a dielectric union installed.
The more dissimilar metal joints within a given system (with or without dielectric unions) the higher will be the electrical energy level that drives the corrosion process.
Pin hole leaks..High copper levels in the water..High levels of heavy metal leached from solder joints and fixtures..and eventually the replacement of the piping due to chronic failures.
These failures do not always take place at the site of the bi-metal connection, but may be in a cell formed quite a distance from it. The key to solving electrolytic corrosion problems is to take the fuel away (the mili-voltage DC current generated at each and every bi-metal joint)..Bud.

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