When comparing Hot-dip galvanized pipe vs Cold galvanized pipe, the main differences lie in coating process, thickness, and durability. Hot-dip galvanized pipes are immersed in molten zinc, creating a thick alloy-bonded zinc layer that offers excellent corrosion resistance and long service life, making them ideal for outdoor and harsh environments. Cold galvanized pipes, often referring to electro-galvanizing or zinc-rich coating, provide a thinner and smoother surface layer with limited protection, which is more suitable for indoor applications or as a maintenance solution.