According to plumbing code, what type of pipe can corrosive acid flow through?

Ceramic glazed or unglazed vitrified clay pipe is specifically designed to handle corrosive substances, including acids. This type of pipe exhibits high resistance to chemical degradation due to its dense and non-porous nature, especially when glazed. The glazing provides an additional layer of protection, preventing any corrosive chemicals from interacting with the internal surface of the pipe.

Materials like plastics or PVC can sometimes handle specific types of acids or chemicals, but they may not have the same level of chemical resistance across all types of corrosive substances. Galvanized steel, on the other hand, is susceptible to corrosion when exposed to acidic environments, leading to significant deterioration over time. Thus, for applications involving the flow of corrosive acids, ceramic vitrified clay pipe remains the most suitable choice according to plumbing code.