By developed length of piping and fittings for venting and fixture units connected to it for water supply or drainage
Most codes do not allow Galvanized piping/fittings on gas piping. I have used galvanized pipe/fittings on exterior gas piping before in the state of Michigan but other states do not allows this. Check with your local code authorities.
If you do connect copper pipe to galvanized pipe, you will need a dielectric coupling or else the galvanized pipe will corrode. Same with connecting galvanized pipe to brass fittings. Brass is an alloy that contains copper and therefore the same electrolytic properties will exist unless a dielectric coupling is used. Hope that helps you out.
GI Pipe is "Galvanized Iron" Pipe. These days the pipe will likely be made from steel rather than iron.
Yes.
No, fittings go over the pipe
ya the galvanized pipecan be use in undergrounds,,, because it is an iron pipe
Yes it can, you may just need a few more fittings to match the galv pipe to the heater inlet.
Yes
Galvanized Iron pipe
galvanized iron pipes commonly used on water pipe lines, it is dipped into zinc for corrosion protection
It's a type of pipe