Insulating it
You don't, you remove the plastic junk and replace the toxic plasatic with cast iron
You wold join asbestos pipe and iron pipe with great care, being sure to avoid disturbing the asbestos pipe or releasing dust. The best solution would be to remove the asbestos pipe (following established procedures to ensure it is done properly, by qualified people) and run new pipe.
galvanize wrought iron pipe
Bi pipe is a black iron pipe.
Galvanized Iron pipe
You don't, you remove the plastic junk and replace the toxic plasatic with cast iron
You wold join asbestos pipe and iron pipe with great care, being sure to avoid disturbing the asbestos pipe or releasing dust. The best solution would be to remove the asbestos pipe (following established procedures to ensure it is done properly, by qualified people) and run new pipe.
This takes a while, but should work. Use a hacksaw blade on the inside of the pipe and cut just through the pipe in two or three places depending on the size of the pipe. Once it is cut, you can pry the pieces out of the cast iron body.
Asbestos pipe is made of cement that contains asbestos fibers. Iron pipe is made from cast iron.
galvanize wrought iron pipe
Bi pipe is a black iron pipe.
GI Pipe is "Galvanized Iron" Pipe. These days the pipe will likely be made from steel rather than iron.
was asbestos used in production of cast iron pipe
Cast iron is not threaded, steel pipe is.
PVC plastic is one type of pipe that does not contain iron.
Galvanized Iron pipe
Not knowing your situation it's hard to answer. What type, cast iron, PVC, brass? Is it on wood over a basement or crawlspace or in concrete? Cast iron on wood over a basement or where you can get to it underneath. You can be gentle, peel out the lead and packing that is holding it in and remove it. You can break the collar and take it out in pieces. Might break the pipe under it if not careful. You can cut the pipe farther down the line and replace it with PVC with a rubber coupler between the PVC and the cast iron. If you just remove the collar, when you replace it, you can just use a repair ring that screwes to the floor. As long as the pipe is supported underneath the floor, the collar does not need to be attached to the pipe.