Galvanized piping Galvanization

in 20th century, galvanized piping replaced previously-used cast iron , lead in cold-water plumbing. typically, galvanized piping rusts inside out, building layers of plaque on inside of piping, causing both water pressure problems , eventual pipe failure. these plaques can flake off, leading visible impurities in water , slight metallic taste. life expectancy of galvanized piping 70 years, may vary region due impurities in water supply , proximity of electrical grids interior piping acts pathway (the flow of electricity can accelerate chemical corrosion). pipe longevity depends on thickness of zinc in original galvanizing, ranges on scale g40 g210, , whether pipe galvanized on both inside , outside, or outside.

since world war ii, copper , plastic piping have replaced galvanized piping interior drinking water service, galvanized steel pipes still used in outdoor applications requiring steel s superior mechanical strength. use of galvanized pipes lends truth urban myth water purity in outdoor water faucets lower, actual impurities (iron, zinc, calcium) harmless.

the presence of galvanized piping detracts appraised value of housing stock because piping can fail, increasing risk of water damage. galvanized piping need replaced if housing stock outlast 50 70 year life expectancy, , jurisdictions require galvanized piping replaced before sale. 1 option extend life expectancy of existing galvanized piping line epoxy resin.