In modern industrial construction, carbon steel prefabricated piping spools play a critical role in improving installation efficiency, reducing on-site welding, and ensuring consistent quality control. Widely used in oil & gas, petrochemical, power generation, and water treatment systems, piping spools are fabricated in controlled workshop environments before being transported to the project site for assembly. This article provides a clear overview of the key standards governing carbon steel prefabricated piping spools, helping engineers, procurement teams, and project managers better understand specification requirements and selection criteria.