ASTM A53/A53M-20.Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless. ASTM A53/A53M cover seamless and welded black and hot-dipped galvanized steel pipe in NPS 1/8 to NPS 26 (Note 1), inclusive, with nominal wall thickness (Note 2) as given in Table X2.2 and Table X2.3. It shall be permissible to furnish pipe having other dimensions provided that...