Which type of pipe is typically yellow or black in color?

Polyethylene pipe is commonly recognized for its use in gas distribution systems and is typically colored yellow or black. These color designations serve important safety and identification purposes, as yellow is often used to indicate gas lines, helping to prevent accidental strikes during digging or construction activities. In contrast, black polyethylene pipe is frequently used for other purposes such as water supply lines and irrigation, but it’s still associated with gas in specifics contexts when marked appropriately.

PVC pipes are usually white or grey, making them easily distinguishable from polyethylene varieties. Cast iron pipes are generally black or dark grey and are predominantly utilized for sewer systems and drainage rather than gas lines. Steel pipes have a metallic finish and are typically used for various industrial applications, including water, but do not generally match the color specification of yellow or black designated for gas lines. Thus, the identification of polyethylene pipe as yellow or black aligns with its common usage in the context of gas distribution.