Normative basis for the installation of pull-off valves on chemical loading/unloading hoses

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SH/T 3221-2023 “Design Standard for Automotive Loading and Unloading Facilities for Petrochemical Materials”, Clause 4.8: Automotive loading and unloading facilities shall be equipped with safety protection devices or measures to prevent leakage caused by detachment of loading and unloading equipment. 6.3.1 When quick connectors are used to connect the loading and unloading nozzles and transportation equipment for flammable liquids, liquefied hydrocarbons, hydrogen, cryogenic materials, extremely and highly hazardous materials, as well as materials that are prone to polymerization, unstable, or corrosive, dry separation valves should be employed ； Breakaway valves shall be installed at the ends of loading/unloading swivel joints for materials such as liquefied hydrocarbons, liquid ammonia, extremely and highly hazardous liquefied gases, highly toxic liquids, liquid carbon dioxide, hydrogen, etc. TSGR0005-2011 \"Regulations on Safety Technical Supervision of Mobile Pressure Vessels\" 6.3 Pipes for Loading and Unloading (2) Safety measures to prevent the pipes used for loading and unloading from being pulled apart ； TSG 07-2019 “Rules for Licensing of Special Equipment Manufacturing and Filling Units”, C3.4.2: Dedicated filling stations (lines) and filling equipment shall be equipped with interlock protection devices or measures to prevent the disconnection of loading/unloading hoses. According to Clause 7.1.9 of the TSG-21-2016 “Safety Technical Supervision Regulations for Stationary Pressure Vessels”, for operations involving the loading and unloading between mobile and stationary pressure vessels, the connecting devices must meet the following requirements: (2) There must be an interlock protection device to prevent the disconnection of loading/unloading pipes or hoses. TSGR4002-2011 \"Rules for Licensing the Filling of Mobile Pressure Vessels\" A3.2 Special loading and unloading platforms (lines) and devices must be equipped with interlock protection mechanisms to prevent the loading and unloading pipes from being pulled apart. GB50156-2021 \"Technical Standards for Automobile Fuel, Gas, and Hydrogen Refueling Stations\" 7.5.1 Safety shut-off valves shall be installed on the liquid-phase and gas-phase pipelines connecting to LPG tank trucks. \"Guidelines for the Safe Renovation of Vehicle Loading and Unloading Facilities for Flammable Liquids, Liquefied Hydrocarbons, and Liquefied Toxic Gases in Shandong Province\" (Lu An Ban Han [2024] No. 2), Section 3.8: To prevent the clamping elements of the loading/unloading nozzles and the quick-connect fittings on vehicle tankers from loosening or coming apart during loading and unloading, clamping devices to prevent detachment should be used; it is recommended to employ spring-loaded locking pins made of stainless steel.