This final rule deletes references to certain voluntary design and construction standards concerning cast iron, ductile iron, wrought steel, and wrought iron pipe; copper pipe and tubing; well casing tubing and drill pipe; bronze flanges; and other materials. The references are no longer needed for safety because the materials have minimal or no usage in new gas and hazardous liquid pipelines. This action significantly reduces the number of voluntary standards that are now incorporated by reference in Parts 192 and 195 and the burden of keeping these references up-to-date.