What are the requirements for static electricity bonding between flanges?

Static bonding connections shall be made using copper flexible wire of not less than 6 mm2; if there are more than 5 flange bolts, static bonding may not be required.

When the clear distance between parallel pipes is less than 100 mm, a cross-link should be added every 20 m； When pipes intersect with a clear distance of less than 100, an overpass should be added. The poster can take a look at the SH3097-2000 Standard for Static Grounding in Petrochemical Industries.

1. All metal components of pipeline systems that transport flammable, combustible, and explosive media (including jackets and metal cladding) must be grounded. There should be a grounding point at both ends of the pipeline and every 200 to 300 meters. For parallel pipelines with a spacing of less than 10 cm, equipotential bonding should be carried out every 20–30 meters. When the spacing between intersecting pipelines is less than 10 cm, equipotential bonding should be carried out. 2. The grounding resistance of the pipeline should not exceed 30Ω. The grounding point should be located at the fixed pipe piers (supports). 3. For the non-conductive sections of metal pipes in between, in addition to being shielded, the metal pipes at both ends should be connected to the grounding main respectively. Metal components on non-conductive pipeline sections should be bonded and grounded. 4. At the flange connections of metal pipelines, as well as in metal flexible hoses and metal swivel joints, flanges with no fewer than 5 bolts for connection generally do not require bonding. If the contact surface at one end is made of insulating material, a bypass connection should be made. During bridging, its resistance value should be less than or equal to 0.03Ω.

Check the relevant requirements of standard 50235

It seems that some people are confusing lightning protection bonding with static electricity protection bonding.

I would like to ask what standards should be used for bonding in lightning protection and anti-static measures. 6# gdcool

Standard for Static Electricity Safety Inspection in Chemical Enterprises of the Chemical Industry Industry Standard of the People’s Republic of China: “5.1.1 The total leakage resistance of each production unit system (or unit) shall be below 1×106Ω.” The grounding resistance of each dedicated static grounding electrode should not exceed 100Ω. 　　5.1.2 When metal equipment is connected to each other or pipes are connected to each other using metal flanges, no additional jumper wires are required. 　　But there must be more than two bolts for connection. Its total leakage resistance must meet the requirements of clause 5.1.1. ”

GB12158-2006 General Guidelines for Preventing Static Electricity Accidents, SH 3097-2000 Code for Design of Static Electricity Grounding in Petrochemical Industries, HG/T 23003-1992 Procedures for Inspecting Static Electricity Safety in Chemical Enterprises – these three should be considered together. . .