By the color
The base metal is iron - the active metal is zinc (galvanized)
Metal LENOX
GI Pipe is "Galvanized Iron" Pipe. These days the pipe will likely be made from steel rather than iron.
without touching it? no what you will have to do is sand or scrape the pipe then you will be able to tell the difference. if its a dull metal then its black iron but if it shines then it would be galvanized.
Yes.
Yes, the kind you use for duct work.
ya the galvanized pipecan be use in undergrounds,,, because it is an iron pipe
Galvanized pipe will be silver/gray color. Copper will be copper. Use a magnet, it'll stick to galvanized pipe but not to copper. Drinking water lines should not be black steel pipe.
Yes
Galvanized Iron pipe
galvanized iron pipes commonly used on water pipe lines, it is dipped into zinc for corrosion protection
Depends on local codes I use Galvanized piping and fitting when I know the piping is going to be exposed to moisture (dampness) or the elements