To prevent using as potable water.
Steam carrying pipes
Pipes carrying natural gas are typically color-coded with a yellow exterior to indicate that they contain gas. This yellow color helps workers and emergency responders easily identify gas lines and take appropriate safety precautions.
Red
colour code for raw water
Copper doesn't rust
Well, it's really a great questions. As for the black pipes, it's because during the manufacturing process, some materials are added to pretect the pipe, ususlly to anti-UV. In most cases, those pipes that re under the ground or the wall, there's no need to add black materials, and these pipes are ususlly the original color of the ingredients of pipes. Justi like RIIFO's PPR pipes that are usually green.
Exhaust gas pipes are silver and are made of metal.
The space is usually called a chase in the US.
To help slow degradation of the plastic from the ultraviolet wavelength of sunlight.
Other wise heat loss will occur and the radiators wont be as hot.
Other wise heat loss will occur and the radiators wont be as hot.
A carrying medium is a substance or material that is used to transport something from one place to another. For example, blood in the circulatory system acts as a carrying medium to transport nutrients and oxygen to cells in the body. In technology, pipes can serve as a carrying medium for liquids or gases in a system.