Dissimilar metals in contact to each other cause a Galvanic Reaction resulting in one or both metals corroding and causing a leak. A Dielectric Union separates the two metals by uses of rubber and/or plastic thus preventing a Galvanic Reaction. Also in most Plumbing Codes, you can use a Brass fitting in place of a dielectric union as Brass does not react with Copper or Steel Piping (Galvanize Piping).
There are copper fittings that will connect to galvanized.
Yes! The best copper-to-galvanized connection is made using a brass nipple in between the two dissimilar metals. The nipple should be a minimum of 2 1/2" long (preferably six inches long). Bronze is an alloy (copper + tin). Brass is an alloy (copper + zinc).
Commonly, they use zinc, copper, chrome or nickel for that.
When using SMAW ("stick") welding, galvanized steel can be welded in the same manner as uncoated steel. ... The thicker the zinc coating, the more fumes are generated, and those fumes have to be able to escape easily into the atmosphere and not be forced through the liquid weld metal.
try using galvanized-- large head 1- 1/2 inch long
Strontium Titanate has a dielectric constant of 233. TDK in Japan makes Ultra-high Voltage Ceramic Capacitors using this as the dielectric material. Compared to distilled water at 76.7 - 78.2 (lowers as temperature rises). Types of glass can vary between 4 and 10.
Dielectric Mirror glass is used un a Mirror TV because the viewing quality when the TV is on through the Dielectric Glass is much better. A 2 way glass can be used, but you will loose from the quality
Using copper washers as opposed to using aluminum aren't to much more beneficial except for the fact that copper is more reusable. On the down side copper is more expensive.
=== === By the way I doubt very seriously your using copper pipes your using copper TUBING
No. Pressure and volume are not the same. You may loose a few pounds of pressure by using different pipes and sizing. But, what you may lose lots of is volume, the amount of water actually flowing thru the pipes. Old galvanized pipe corrodes on the inside and loses the volume needed to supply adequate water.
The Silicon di-oxide acts as a dielectric which forms a capacitor.
Copper tube is a favorite choice for plumbing, heating, cooling and other systems. Copper tube is most often used for supply of hot and cold tap water as refrigerant line in HVAC systems. There are two basic types of copper tube, soft copper and rigid copper. Copper tubing is joined using flare connection, compression connection, or solder. Copper offers a high level of corrosion resistance, but is becoming very costly. alliedallcityinc.com