PHMSA has published the updated 2021 inspection protocols for Gas Distribution, Gas Transmission, Hazardous Liquids, Liquified Natural Gas, Underground Gas Storage and Drug & Alcohol. Changes this year include D&A questions, new Liquid Rule content, new gas rule content and miscellaneous changes from the various content teams. You can access these on PHMSA’s Forms page: Pipeline Forms | PHMSA (dot.gov).