【Common Issues in Haichuan Pipeline Design】--Requirements for Flange Bridging Setup

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Requirements for flange bridging: 1. Article 4.2.2 of the \"Code for Design of Lightning Protection of Buildings\" (GB50057-2010): For buildings classified as Category I in terms of lightning protection, the requirements regarding lightning induction are as follows: 2. When the transition resistance at connections such as bends, valves, and flanges of long metal objects is greater than 0.03Ω, those connections should be bridged using metal wires. For flanges connected with no fewer than 5 bolts, in a non-corrosive environment, skipping the check is permissible. 2. Article 10.12.1 of the “Code for Pressure Piping – Industrial Piping, Part 4: Fabrication and Installation” (GB/T20801.4-2006): For pipelines that require static grounding, good electrical conductivity must exist between various sections of such pipelines. When the resistance value between each pair of flanges or threaded joints is greater than 0.03Ω, a wire bridge should be installed. 3. Article 7.13.1 of the \"Code for Construction of Industrial Metal Piping Projects\" (GB50235-2010): For pipelines for which static grounding is required in the design, if the resistance value between each pair of flanges or other joints exceeds 0.03 ohms, a bonding wire should be installed. 5. Article 8.9.1 of the \"Code for Acceptance of Construction Quality of Metal Piping in Petrochemical Projects\" (GB50517-2010): For pipelines that require static grounding, if the resistance value between each pair of flanges or threaded joints is greater than 0.03Ω, a wire bridge connection should be provided. 6. Article 4.3.3 of the \"Code for Design of Static Electricity Grounding in Petrochemical Industries\" (SH3097-2000): In pipeline systems, when metal flanges are fastened using metal bolts or clamps, it is generally not necessary to install additional static electricity connection wires; however, it is essential to ensure that there is good electrical contact between at least two bolts or clamps. 7. Article of the \"Code for Construction and Acceptance of Pipelines for Highly Toxic and Flammable Media in Petrochemical Industries\" (SH3501-2001): For pipelines that require static grounding, good electrical conductivity must exist between each section of the pipeline. When the resistance value between each pair of flanges or threaded joints is greater than 0.03Ω, a wire should be used for bridging. 8. Article of the \"Code for Design of Oil Depots\" (GB50074-2002): Flange connections of oil (oil and gas) pipelines shall be bridged. When connected by no less than 5 bolts, bypass wiring is not required in non-corrosive environments. 9. Article 10.3.3 of the \"Code for Design and Construction of Automobile Fuel and Gas Refueling Stations\" (GB50156-2002): In explosion-hazardous areas, metal wires should be used for bonding at connections such as flanges on oil, liquefied petroleum gas, and natural gas pipelines, as well as at both ends of rubber hoses. When there are no fewer than 5 connection bolts on the flange, bypass wiring is not required in non-corrosive environments.