Regulations on static grounding of pipelines

I. Basic requirements for static electricity grounding installation: For pipes that require static electricity grounding, conductivity must exist between various sections of the pipe. When the resistance value between each pair of flanges or threaded connections exceeds 0.03Ω, a wire bridge should be installed. ? ? ? ? When the earth resistance value of the piping system exceeds 100Ω, two grounding leads should be provided. The grounding lead should be welded. For titanium and stainless steel pipes that are connected to an electrostatic ground, the wires used for bridging or grounding must not be connected directly to these pipes; instead, titanium or stainless steel plates should be used as a transition element. ????????Materials or components used for electrostatic grounding must not be painted before installation. The conductive contact surfaces must be rust-free and tightly connected. ????????After the static electricity grounding installation is completed, it must be tested; if the resistance value exceeds the specified limit, inspections and adjustments should be carried out. II. Self-built network for the anti-static grounding system??????? The anti-static grounding wires for equipment, units, storage tanks, pipelines, etc., should be connected separately to the grounding electrode (natural grounding electrode or reinforced steel beams in buildings), and the connection bolts should be of at least M10 size; they must also be equipped with anti-loosening devices and coated with electrical composite grease. The strength of the damaged pipeline must not be reduced when welding terminals are used for connection. ????????When a metal flange is fastened using metal bolts or clamps, no additional jumper wire is required. Before installation under corrosive conditions, the contact surfaces between two or more bolts and clamps should be degreased and rust-free, and lock nuts should be installed. ????????When the clear distance between metal pipes installed parallel to each other on non-metallic frameworks in explosion-hazardous areas is less than 100 mm, it is advisable to use metal wires for bridging every 20 m ； When the clear distance between intersecting metal pipes is less than 100 mm, metal wires should be used for bridging. For storage tanks with a capacity of 50 m3 or more, there should be no fewer than two grounding points; the distance between these grounding points should not exceed 30 m. They should be located at the bottom of the tank and connected to the grounding electrodes in a symmetrical manner around the tank’s bottom. The grounding electrodes should form a closed circular circuit. ????????The pipes are grounded at the entrances and exits of the equipment area as well as at the branching points. Long-distance five-branch pipelines should be grounded every 100 meters???????? The anti-static grounding system should form its own network; it is possible to share grounding main systems for lightning protection, electrical protection, anti-static effects, and protection against stray currents. ????????Except for the metal equipment itself, which also serves to conduct lightning currents, the static grounding branch is not connected to the lightning current conducting branch.