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Galvanic corrosion/open system

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by Rick Stanley, Mar 11, 2009.

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  1. Rick Stanley

    Rick Stanley Feeling the Heat

    Joined:
    Dec 31, 2007
    Messages:
    391
    Loc:
    Southern ME
    Does everyone(anyone) agree with this? http://www.radiantdesigninstitute.com/page46.html

    I've been agonizing over this in piping up my Garn. I thought that ANY yellow metal (copper, brass, bronze) in contact with any iron or steel would be a problem. This says different. Wouldn't be the first time I was wrong.



    DIELECTRIC UNIONS

    Here is a very misunderstood fitting, that is seldom used properly. The problem that a dielectric union is suppose to solve is a dissimilar metal problem between steel and copper, such as a steel water tank and copper pipe.
    Dielectric unions in a hot water heating system are nothing but trouble and usually leak in a short time. The antifreeze, boiler additives or acid water conditions cause the gasket to deteriorate.
    There are better ways to handle this problem:
    FIRST REMEMBER THAT COPPER HAS NO PROBLEM WITH BRASS OR CAST IRON, IF YOU PUT A BRASS OR CAST IRON FITTING BETWEEN THE STEEL AND THE COPPER THE PROBLEM IS SOLVED.
    EVEN ON A HOT WATER TANK, A BRASS NIPPLE OUT OF THE TANK WOULD BE THE BEST CHOICE.

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