Flanges can be used to connect pipe ends or to connect two devices; the dataset includes major raw and auxiliary materials, energy use, atmospheric emissions, and waste from the production process, but infrastructure such as production equipment and factory construction is not included within the system boundary of the dataset; the life cycle inventory is compiled from data derived from multiple sources; the manufacturing process of flanges includes raw material preparation, plate processing, cutting, stamping, forming, hole machining, inspection, packaging, and other procedures.