The relationship between static bonding and lightning protection
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Dear sea friends: We are currently facing the following issue: Some pipes require electrostatic bonding; others serve for lightning protection, and different standards specify varying requirements. For example, according to SH3097‑2000 4.3.3, when metal flanges are fastened using metal bolts or clamps, it is generally not necessary to install additional electrostatic connection wires, but it is essential to ensure that there is good electrical contact between at least two of the bolts or clamps. 2.GB 15599-95 4.6 Pipelines 4.6.1 Oil transport pipelines can be used as their own lightning protectors; metal bonding wires should be installed at the connections of their flanges and valves. When the flange is connected using 5 or more bolts, it is not necessary to use a metal wire for bridging, but an electrical path must be established. Article 7.13.1 of GB50235-2010 stipulates that for pipelines designed with requirements for static grounding, a bonding wire shall be installed when the resistance between each pair of flanges or other joints exceeds 0.03 ohms. After reading the above. . . . I’m dizzy… Everyone is welcome to share their thoughts; as long as you know in which guidelines such information or similar details can be found, you can write it down, and then I’ll summarize it for everyone. We need to discuss the final outcome: what is the relationship and difference between bonding and grounding in terms of static electricity and lightning protection, which standards address these aspects, and whether they can be shared in different applications.
1. Article 14.2.12 of the \"Code for Design of Oil Depots\" (GB50074-2014): For process pipelines located in explosion-hazardous areas, the following lightning protection measures shall be taken: 1. The metal flange connections of the process pipelines shall be bonded together; in cases where there are no less than 5 bolts used for connection, bonding is not required in non-corrosive environments. II. Article 10.3.3 of the \"Code for Design and Construction of Automobile Fuel and Gas Refueling Stations\" (GB 50156—2002) stipulates that in areas prone to explosion, 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.
Project experience: You can use a bypass for 5 or fewer bolts