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**Standards such as the \"Code for Pressure Piping – Industrial Piping, Part 6: Safety Protections\" (GB/T 20801.6-2020) and the \"Fire Protection Standards for Engineering Design of Fine Chemical Enterprises\" (GB 51283-2020), as well as industry standards like the \"Requirements for the Installation of Flame Arresters\" (HG/T 20570.19-1995), the \"Design Code for Tank Areas in Petrochemical Storage and Transportation Systems\" (SH/T 3007-2014), and the \"Selection, Inspection, and Acceptance Criteria for Flame Arresters in Petrochemical and Oil Pipeline Systems\" (SH/T 3413-2019), and regulatory provisions such as the \"Regulations on Safety Supervision of Pressure Piping\" (TSG D0001-2009), all contain detailed specifications regarding flame arresters installed on pipelines, pipe ends, and equipment. ①The \"Code for Pressure Piping – Industrial Piping, Part 6: Safety Protection\" (GB/T 20801.6-2020) stipulates that flame arresters shall be installed in the following equipment and piping systems: (1) Atmospheric storage tanks for flammable liquids, as well as the inlets and outlets of vent valves and breathing valves in low-temperature storage tanks containing liquid hydrocarbons, LNG, etc., and the pipes connecting them to the atmosphere ； …②Electronic version of the \"Fire Protection Standards for Engineering Design of Fine Chemical Enterprises\" (GB 51283-2020): (1) At the vents or breather valves of atmospheric-pressure storage tanks for Class A B and Class B flammable liquids, as well as low-temperature storage tanks for liquefied hydrocarbons and liquefied natural gas ； …③The \"Code for Fire Protection Design of Petrochemical Enterprises (2018 Edition)\\" (GB 50160-2008) stipulates that: (1) Fixed-roof tanks storing Class A, B, and C liquids shall be equipped with flame arresters and vent valves ； …④The \"Code for Design of Oil and Gas Recovery Facilities in Oil Loading Systems\" (GB 50759-2012) stipulates that: (1) Fixed-roof storage tanks and horizontal storage tanks used for storing liquids of Class A, B, and C A ； …⑤The standard \"Installation of Flame Arresters\" (HG/T 20570.19-1995) stipulates that: (1) For storage tanks containing chemical oils with a flash point of 43°C or less, flame arresters must be installed on their direct venting pipes (including those equipped with breather valves) ； …Among them, the cardboard specified in GB 51283-2020 also includes Category C A liquids, and the current corrections and supplementary notes do not remove these Category C A liquids. Is a flame arrester required for the venting of Class A C liquids?