CPVC pipe is safe for drinking water.
one pipe is for food and one is for your drink.
Hot water pipe rust first as compared to the cold water pipe for the same chemical composition of the water.
Cold water 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.
If you are referring to a regular building, the cold water feed pipe goes directly to all cold faucets, toilets and hot water tank. The purpose seems obvious.
PVC pipes do not corrode, hence these are used for drinking water supply.
A cold drawn seamless pipe has better dimensional tolerance, a higher surface finish and better mechanical properties than an equivalent hot finish seamless pipe. For applications that can make use of the thinner pipe walls and closer tolerances, a cold drawn seamless pipe is the better option.
Electrical grounded to the cold water pipe, usually before the first fitting once it is through the foundation..
it is called flex pipe its kinda expensive
Rising main for drinking water or distribution pipe for other draw off points
Usually on the top, on the incoming cold pipe.