HG/T 20675-1990 Design code for electrostatic grounding in chemical enterprises
Some standard content:
Industry Standard of the People's Republic of China
HG/T20675—1990
Design Code for Electrostatic Grounding in Chemical Enterprises
1990-01-01
1990-04-01
Ministry of Chemical Industry of the People's Republic of China
2 General Provisions
2.1 Scope of Electrostatic Grounding
2.2 Connection Methods of Electrostatic Grounding
2.3 Electrostatic Grounding Resistance value of connection system
2.4 Electrostatic grounding connection point and grounding terminal
2.5 Electrostatic grounding branch line and connecting line
2.6 Electrostatic grounding trunk line and grounding body
2.7 Requirements for electrostatic grounding connection
2.8 Requirements for non-conductor shielding grounding
2.9 Other requirements
2.10 Electrostatic grounding of computer rooms and electronic instruments 3
Specific provisions||tt ||Fixed equipment
Pipeline network system
3.3 Loading and unloading platforms and dock areas with electrostatic hazards, 3.4 Moving objects that can cause electrostatic hazards
3.5 Specific methods of electrostatic grounding
Appendix 1 Precautions for electrostatic grounding work
Appendix 2 Terms used in this code
Appendix 3 Explanation of terms used in this code
Preparation instructions
(2)
(8)
(10)
Industry standards of the People's Republic of China
Design code for electrostatic grounding in chemical enterprises
HG/T20675—1990
Electrical Design Technology Center Station of Ministry of Chemical Industry
Design Institute of Jilin Chemical Industry Company
Ministry of Chemical Industry of the People's Republic of China
"Design code for electrostatic grounding in chemical enterprises" is a design standard of the Ministry of Chemical Industry approved and promulgated by the Ministry of Chemical Industry. This regulation is revised on the basis of the Chemical Design Standard CD90A3-83 "Technical Regulations for Electrostatic Grounding Design of Chemical Enterprises" issued by the former Infrastructure Bureau of the Ministry of Chemical Industry. The contents include general principles, general provisions, specific provisions, and three appendices and compilation instructions.
This regulation was proposed by the Electrical Design Technology Center of the Ministry of Chemical Industry, compiled by the Design Institute of Jilin Chemical Industry Company, and reviewed by the Electrical Design Technology Center of the Ministry of Chemical Industry. The editors are Comrade Wu Xiang and Comrade Shi Lin. The chief reviewers are Comrades Yu Junren, Wan Jun, Liang Chunfang, Lan Shikui, Jin Shuize, Sun Rongshan, etc. 1 General Principles
1.1 This regulation applies to the electrostatic grounding design of chemical enterprises and factories. 1.2 The anti-static design of chemical enterprises should be coordinated by the process, piping, equipment, electrical and other professionals, and comprehensively considered, and the following measures should be taken to prevent the hazards of static electricity: (1) Minimize the generation of static electricity during the production process (2) Leak and conduct away static electricity; (3) Neutralize the static electricity accumulated on objects; (4) Shield objects with static electricity; (5) Make the inner and outer surfaces of objects smooth and without edges. 1.3 The main function of electrostatic grounding is to leak and conduct away the static electricity on charged objects. The electrostatic grounding connection system is an important link in energy grounding. 1.4 This regulation makes specific provisions for the design technical requirements of the electrostatic grounding connection system of chemical enterprises. However, only principled provisions are made for the increase of discharge index, static time, air humidification and floor conductivity. 1.5 The calculation of the grounding resistance of the electrostatic grounding body can refer to GBJ65-83 "Grounding Design Specifications for Industrial and Civil Power Installations".
2 General Provisions
2.1 Scope of Electrostatic Grounding
2.1.1 Industrial electrostatic grounding measures (hereinafter referred to as electrostatic grounding) shall be taken for objects in explosive and fire hazardous environments that may generate electrostatic hazards.
2.1.2 For objects in non-explosive and fire hazardous environments, if their static electricity may hinder production operations, affect product quality or cause static electric shock to the human body, electrostatic grounding shall be taken. 2.1.3 During the production, storage and transportation process, when devices or materials are in close contact with each other and then quickly separated, and may generate and accumulate static electricity, or may generate electrostatic hazards, electrostatic grounding shall be taken. 2.1.4 In the following cases, special electrostatic grounding measures may not be taken (except for computers, electronic instruments, etc.): (1) When the metal conductor is already connected to the grounding system of electrical protection grounding, stray current protection, electromagnetic shielding, etc.:
(2) When there is a close mechanical connection between metal conductors, and in any case, there is sufficient electrostatic conductivity between the metal contact surfaces.
2.1.5 For any charged body in the flow, use a grounded conductor to conduct its static charge. 2.1.6 When equipment and pipelines are grounded, their casings and components should be connected to form a conductive whole and be connected to the ground. It is strictly forbidden to have metal objects that are insulated from the ground. i
2.1.7 The grounding terminals of various static eliminators should be grounded according to the requirements of the product manual. 2.2 Static grounding connection methods
2.2.1 Objects that need to be grounded should select the following static grounding connection methods (hereinafter referred to as grounding connection) according to their resistivity, surface resistivity or conductivity: (1) Static conductors should be directly grounded.
(2) Static conductors should be indirectly grounded. (3) In addition to indirect grounding, the following electrostatic non-conductors should also be grounded for the necessary static time: a. non-metallic bodies with a resistivity of 101~10129.m, b. solid surfaces with a surface resistivity of 1011~10132; c. liquids with a conductivity of 10-10~10-12S/m. 2.2.2 For electrostatic non-conductors other than those specified in 2.2.1 (3), in addition to indirect grounding, other measures such as static eliminators and static eliminators should be taken to prevent electrostatic hazards. 2.3 Resistance value of electrostatic grounding connection system
2.3.1 The grounding resistance value of each set of dedicated electrostatic grounding bodies should generally be less than 1009. In places with high soil resistivity such as mountainous areas, the grounding resistance value should be less than 1000%. 2.3.2 The resistance value of metal bodies such as electrostatic grounding branches and trunks can be ignored. 2.3.3 Individual electrostatic connection points should be assembled and maintained in accordance with the requirements of Article 2.7. The resistance value of its connection may not be evaluated.
When other grounding devices are used for electrostatic grounding, the grounding resistance value shall be determined according to the requirements of the grounding device. 2.3.4
2.4 Electrostatic grounding connection points and grounding terminals
2.4.1 Special grounding connection terminals shall be set at certain positions of equipment and pipelines as connection points for electrostatic grounding. The connection points between relevant components inside the equipment and the grounding lead-out points of reinforced concrete foundations may be set in accordance with the relevant provisions of this Code.
2.4.2 The location of the grounding connection point shall meet the following requirements: (1) Not easily damaged by external forces (2) Convenient for inspection and maintenance (3) Convenient for connection to the grounding trunk line (4) Not hindering operation) (5) Not easy to form and accumulate explosive, corrosive and other mixtures. 2.4.3 When the diameter of the equipment is greater than or equal to 2.5m or the volume is greater than or equal to 50m2, there should be more than two grounding points. The grounding points should be evenly arranged along the periphery of the equipment, and the spacing between them should not be greater than 30m. The requirements for pipeline grounding connection points are shown in 3.2.1. 2.4.4 The following types of grounding terminals can be used for direct grounding: (!) The exposed metal surface reserved on the equipment or pipeline shell (including its support). (2) The metal bolt connection part of the equipment and pipeline. (3) Use special metal grounding plates or bolts, and their specific requirements should meet the following requirements: a. The metal grounding plate or bolt can be welded (or fastened) to the metal shell or support of the hand equipment or pipeline. 2
b. The material of the metal grounding plate or bolt should be determined according to the material of the metal shell of the equipment and pipeline. (a) When the metal shell of the equipment and pipeline is made of ferrous metal, the metal grounding plate should be made of galvanized steel. (6) When the metal shell of equipment or pipeline is made of non-ferrous metal or stainless steel, the metal grounding plate should be made of the same material as the equipment or pipeline shell.
(c) Bolts are generally made of galvanized steel.
c. The cross-section of the metal grounding plate should not be less than 50×10mm. The minimum effective length for grounding connection should be 60mm (1 hole Φ11) for small equipment and 110mm (2 holes Φ11) for large equipment. The specification of the grounding bolt should not be less than M10.
: d. When using reinforced concrete foundation for static grounding, a 200×200×6 steel plate should be embedded in an appropriate position, and a special metal grounding plate should be welded on the steel plate. The staggered reinforcement of the pre-prepared steel plate should be welded to the main steel bar of the foundation (or through a section of steel bar). (4) Grounding terminal strip.
: 2.4.5 The following types of grounding terminals can be used for indirect grounding: (1) The wall of a metal container for storing liquids and powders. (2) Metal objects buried in charged bodies with a contact area greater than 2000mm2. (3) Use a dedicated metal grounding plate, the specific requirements of which shall comply with the following provisions: a.The dedicated metal grounding plate should be tightly bonded to the non-metallic solid surface, and the contact area should be greater than 2000mm2. b. The bonding surface can be filled with conductive paint, contact conductive paste or metal box, etc., and the material should make the contact resistance no greater than 102.
c. Flexible lead wires or metal grounding plates that meet the requirements of 2.4.4 (3) should be welded on the metal grounding plate. 2.5 Electrostatic grounding branch line and connecting line
2.5.1 The conductors used as grounding branch lines and connecting lines should be multi-strand metal wires or metal bodies with sufficient mechanical strength, corrosion resistance and not easy to break. The length of the grounding branch line and connecting line should be based on actual needs, and the necessary margin should be reserved. 2.5.2 The grounding branch line of fixed equipment is recommended to be selected according to Table 3.1.3. 2.5.3 The grounding branch line of large mobile equipment should use copper core soft stranded wire or copper core rubber sheathed soft cable with a cross-section of not less than 16mm2.
For grounding branches of general mobile equipment, multi-strand copper core insulated wires with a cross-section of not less than 10mm\ should be used. 2.5.4For grounding branches of devices that vibrate or move frequently, copper core stranded wires with a cross-section of not less than 16mm2 should be used. 2.5.5Metal bolts used for mechanical fixation on equipment and pipelines can also be used for electrostatic connection of the fixed objects. If it is necessary to make an additional electrostatic connection line, multi-strand copper core insulated wires with a cross-section of not less than 2.5mm can be used. 2.5.6Chains should not be used as grounding connection conductors. 2.5.7For the connection between relevant parts inside the equipment, soft copper braided wires with a cross-section of not less than 6mm can be used. 2.5.8Materials such as round steel, flat steel, and soft copper braided wires should be galvanized or coated with anti-corrosion paint. 2.6Electrostatic grounding wire and grounding body
2.6.1In engineering design, electrostatic grounding wire and grounding body should be considered comprehensively with grounding devices for other purposes and arranged uniformly.
2.6.2 The various buildings (structures) within the production unit should be appropriately divided into several relatively independent buildings (structures) (groups), and the electrostatic grounding trunk line should be designed according to their specific conditions. The layout of the electrostatic grounding trunk line in each relatively independent building (structure) (group) should meet the following requirements: (1) It is conducive to the grounding of relevant equipment, pipelines and moving objects that need to be electrostatically grounded on site; (2) There should be no less than two connections between the electrostatic grounding trunk lines at different elevations; (3) The electrostatic grounding trunk line and the independent lightning protection device of the first type of industrial buildings (structures) should comply with the requirements of GBJ57-83 "Building Lightning Protection Design Code" and maintain the necessary distance. 2.6.3 The electrical protection grounding trunk line can be used as the electrostatic grounding trunk line. 2.6.4 The following grounding trunks and lines shall not be used for electrostatic grounding: (1) The working neutral line of the lighting circuit and the working neutral line in the three-phase four-wire system (2) The AC and DC protective grounding systems of various voltage levels of the rectifier (3) The dedicated grounding trunk line of the DC circuit: (4) The "working ground" trunk line of the electronic circuit (5) The lightning drainage line (except for the metal equipment body that also has a drainage function). 2.6.5 The design of the electrostatic grounding body shall meet the following requirements: (1) When the electrostatic grounding trunk line is connected to the protective grounding trunk line at two points in the building (structure), or the protective grounding trunk line is used as the electrostatic grounding trunk line, an electrostatic grounding body may not be installed separately. (2) When independent equipment has a grounding system such as lightning protection and stray current protection for grounding, an electrostatic grounding body may not be installed separately. (3) In addition to items (1) and (2) of this paragraph, the static grounding main line should be equipped with at least one group of independent static grounding bodies at appropriate locations on the opposite sides of the building (structure) (group), or be led to the independent static grounding body through the static grounding main line in the adjacent building (structure) (group).
(4) In addition to the grounding body of the independent lightning protection device of the first-class industrial building (structure), the grounding body for other purposes should be used as static grounding. Computers and electronic instruments and other equipment should take static interference into consideration. (5) When the grounding resistance value of a single reinforced concrete foundation meets the requirements of 2.3.1, the foundation can be used as a static grounding body. In the same group of buildings (structures), even if there are several such common foundations, they are connected to the grounding main line, but they are still regarded as a group of static grounding bodies.
(6) The grounding resistance of each group of dedicated static grounding bodies and grounding bodies for other purposes used as static grounding should meet the requirements of 2.3.1 and 2.3.4.
2.6.6 The steel material specifications for the grounding trunk and grounding body can generally be selected according to Table 2.6.6. The materials used above ground should be galvanized or painted, and the materials used underground should be galvanized.
2.7 Requirements for electrostatic grounding connection
2.7.1 The designated connection of the electrostatic grounding connection system should be welded or bolted. The buried part should be connected by explosion.
2.7.2 The grounding head of the equipment and pipeline and the grounding branch line can generally be connected by bolts, and welding is not suitable. For objects with vibration and displacement, a flexible connecting wire transition should be added to the connection. 2.7.3 For mobile equipment and tools, battery clamps, alligator clamps, special connection clamps or butterfly nuts should be used to connect to the grounding branch line (grounding trunk). The grounding wire should not be connected by winding with the grounded body.
2.7.4 The specific practices of grounding connection shall meet the following requirements: (1) When lap welding is used at the connection: the lap length must be twice the width of the flat steel or six times the diameter of the round steel. (2) When bolts are used to tighten the connection, the minimum bolt size is M10 (galvanized). The metal contacts should be rust-free, and the metal contacts should be rust-free.
Recommended specifications and units of steel for grounding wire and grounding body
4 (5)
12 (14)
12 (14)
Note: The numbers in brackets are the recommended specifications of steel for Class 2 corrosive environments. The coating should meet the requirements of CD90A6-85 Technical Regulations for Electrical Design in Corrosive Environments of Chemical Enterprises.
Remove oil and dirt, and use a locking nut or spring washer. When the two ends to be connected are made of different materials, measures such as contact conductive coating should be taken to prevent electrochemical corrosion.
(3) When the connection is fixed by battery clamps or other devices, the relevant connection parts should be rusted and degreased. 2.7.5 When metal flanges are fastened by metal bolts or clips, it is generally not necessary to install an electrostatic connection line. Under corrosive conditions, it should be ensured that there are at least two contact surfaces between bolts or clips, and rust and oil should be removed before installation, and anti-loosening nuts should be added during installation.
2.7.6 When the object to be grounded is made of non-metallic materials, an indirect grounding terminal should be selected or set for grounding. This indirect grounding measure should avoid damage such as mechanical vibration, friction, tension and compression, and ensure the integrity of the connection. 2.7.7 The grounding connection of metal parts insulated from the ground (such as gold fan bolts for fixing plastic flanges, metal floats on the oil surface, etc.) can be connected to the ground by galvanized steel washers, galvanized steel wires, and flexible multi-strand metal wires. 2.7.8 In places where electrostatic hazards are serious, in order to make the rotating objects reliably grounded, conductive grease or special grounding facilities (such as slip rings and carbon brushes in non-explosive and fire-proof environments) can be used for grounding. Belts or conveyor belts that easily accumulate static charges and produce electrostatic hazards should use conductive rubber products. 2.8 Requirements for non-conductor shielding grounding
2.8.1 The shielding material should be selected from metal wires, nets, plates with sufficient mechanical strength and thin or thin (such as bare copper soft stranded wire with a cutoff of 2.5mm2, galvanized steel wire mesh with a hole size of 15mm for No. 22), etc. The metal body on the equipment and pipeline can also be used as the shielding material (such as the metal spiral wire of the rubber-clamped cloth suction pipe, the metal shell of the insulation layer, etc.). 2.8.2 The shielding material should be installed firmly and fixed at a fixed point, and there should be no displacement and movement. 2.8.3 Grounding joints should be made at the beginning and end of the shielding and at appropriate positions every 20~30m. 2.9 Other requirements
2.9.1 Requirements for process equipment
(1) Under the condition that other conditions are met, materials that generate less static electricity when in contact with each other should be used first. (2) For parts that can continuously generate static electricity due to friction, containers and mobile equipment that store a large amount of charged bodies, metal materials should be used as much as possible. If paint is required, the resistivity of the paint should be lower than that of the charged body. (3) For parts where metal materials cannot be used, rubber, resin, fiber or plastic with uniform material and good conductivity should be used as much as possible.
(4) The connection between metal parts of various parts of the equipment should be well done, and metal bodies that are insulated from the ground are not allowed. (5) According to the location where the equipment is installed, an electrostatic grounding connection terminal should be provided. The terminal should be manufactured and installed at the same time as the equipment body, and on-site welding or drilling should be avoided as much as possible. 2.9.2 Requirements for process production
(1) In order to reduce the leakage resistance value of the object, a suitable antistatic agent or conductive coating should be selected. (2) Appropriate measures should be taken to ensure the settling time and relaxation time in the production process. The settling time of liquids should comply with the provisions of Table 2.9.2. The relaxation time of flowing objects should not be less than 30s. Table 2.9.2
Liquid conductivity
>10~13~10-8
10-1+~10-1#
<10-14
Standing time
Volume (m2)
50~506
Unit: minutes
(3) Where process conditions permit, temperature and condensation equipment should be installed to ensure that the relative humidity is not less than 50~65%, or water should be sprinkled on the ground regularly.
2.9.3 In places with electrostatic hazards, anti-static floors or conductive floors should be laid. The leakage resistance of the floor in general places should be less than 102. In explosive hazardous environments, the floor leakage resistance should be less than 10°9. To prevent electric shock accidents caused by low-voltage power, the leakage resistance of the conductive rubber sheet should be greater than 3×10*0. 2.9.4 Grounded bare metal bodies, such as railings, metal doors, metal brackets, etc., should be installed outside the entrance of the explosion-hazardous environment where static electricity hazards may occur. 2.9.5 Operators should take the following measures in places where static electricity hazards may occur (1) They should use various anti-static protective equipment correctly, such as anti-static shoes, anti-static work clothes, anti-static gloves, etc., and should not wear chemical fiber clothing.
(2) The work surface should be covered with conductive rubber sheets, and the seat of the stool should be made of conductive materials. If the legs of the work table and stool are made of non-metallic materials or have plastic (rubber) feet, the table and seat should be grounded. (3) In addition to complying with the provisions of 2.9.3, the floor should be regularly sprinkled with water and cleaned of insulating dirt. (4) In order to conduct away the static electricity brought by the human body from the outside world, before entering the site, the operator should hold the grounded metal body set up according to the requirements of 2.9.4 with bare hands or bare hands wearing anti-static gloves. (5) In places such as the gunpowder processing room, operators should wear grounded conductive wrist straps, leg straps and use conductive aprons.
2.10 Electrostatic grounding of computer rooms and electronic instruments 2.10.1 When using anti-static raised floors in computer (electronic instrument) rooms, they should be electrostatically grounded to provide a good electrical path for the discharge of static electricity.
2.10.2 Anti-static floors can also be laid in computer (electronic instrument) rooms. In rooms with window air conditioners, the walls6
should be made of anti-static wall surfaces, and the doors should also be made of anti-static materials. 2.10.3 It is strictly forbidden to lay ordinary acrylic, nylon and other chemical fiber carpets or ordinary rubber mats on the floor of computer (electronic instrument) rooms. If carpets are to be laid, they must be anti-static carpets. 2.10.4 The static grounding electrode in the computer (electronic instrument) room should be far away from the lightning protection grounding electrode. 3 Specific provisions
3.1 Fixed equipment
3.1.1 If the metal body of the fixed equipment (including pipelines) has grounding for lightning protection, stray current protection, etc., it is not necessary to make additional static grounding. The static grounding of the metal body of the equipment in the production device area should be connected into a network. 3.1.2 The grounding connection terminal can be set on the side of the equipment, or on the side or end of the metal support that is connected to the equipment as a whole. The general installation height can be 100 to 200 mm above the bolt seat. The terminal structure and orientation should comply with the provisions of 2 and 4.
3.1.3 The grounding branch line and flexible connection line are recommended to be selected according to Table 3.1.3. 3.1.3
Grounding branch line
Flexible connecting line
Grounding branch line, flexible connecting line material selection table Round steel 10mm, flat steel 20.×4mm
Multi-strand copper core insulated wire, 16mm
Bare copper soft stranded wire, 16mm
3.1.4 On the sampling operation table of the tank, a set of grounding terminals should be set on both sides of the operation port to ground the sampling rope, measuring rod and other tools in the upwind direction. The terminal position should be set where it does not hinder the operation. When the floating metal tank top has no lightning protection grounding, the tank top should be connected to the tank body with a flexible connecting line, and the connection points should not be less than two. The flexible connecting line should use a bare copper soft stranded wire with a cross-section of not less than 25mm. The metal float inside the storage tank must be connected to the tank body. ：.When the inner wall of the storage is painted, the conductivity of the paint should be higher than that of the stored liquid, and its resistivity should be below 10*9·m. 3.1.5 Metal parts insulated from the ground, such as bolts, flanges, etc., should be connected to the ground. 3.1.6 In order to eliminate static electricity on the human body, a grounding metal rod should be installed at the entrance of the tower ladder, or a one-meter-long exposed metal surface should be left on the grounded metal railing. 3.2 Pipeline network system
3.2.1 The grounding connection point of the pipeline network should meet the following requirements: (1) The pipelines in each relatively independent building (structure) in the device area can be electrostatically grounded by connecting to the metal shell of the process equipment (flange connection). (2) Grounding connection points should be set at pumps, filters, buffers, etc. in the pipeline network. (3) Pipes in the pipeline network should be grounded at the entry and exit areas, the boundaries of non-explosive hazardous environments, and the pipeline bifurcations. For long-distance non-branched pipelines, they should be reliably connected to the grounding body every 80 to 100 meters. If the grounding resistance value of the pipe rack meets 2.3.1, it can also be used as a grounding body. (4) For non-conductive pipe sections in the middle of metal piping (such as polyvinyl nitride pipes), in addition to shielding protection, the metal pipes at both ends should be connected to the grounding wire respectively, or 6mm3 multi-strand copper core insulated wires should be used for cross-connection and grounding. : (5) Metal parts on non-conductive pipe sections should be grounded. 3.2.2 Metal pipe sections used for cathodic protection shall not be grounded for electrostatics. 3.2.3 The specific methods of electrostatic grounding shall meet the following requirements: (1) Connecting terminals should be set on the pipe wall or pipe support for connection between pipes or between pipes and grounding branches and wires. Fixed pipe supports can also be used for grounding. (2) The steel pipe rack can be used as the conductor of the ground connection system, and the connection end can be welded on the pipe rack. (3) The ground and non-direct buried pipelines should be connected to the ground branch line with flexible connection and fastened with bolts. The connection line should be 6mm? multi-strand copper core PVC wire, and its length should have a margin of not less than 100mm. (4) The underground pipeline should use 40×4mm galvanized flat steel as the branch line, and use welding to connect with the grounding bull wire. The branch line should have a margin of not less than 100mm and be twisted 90 degrees in a plane. (5) When the protective cover of the air duct and the insulation layer is made of thin metal plate, it should be connected to each other by soldering or mechanically fixed bolts. The soldering length between the metal plates should be greater than 100mm. (6) In addition to using binding wire to connect the process pipeline and the heating companion pipe, the steam inlet and return water outlet of the companion pipe should also be connected to the support of the process pipeline. (7) Cast iron socket pipes should be connected with 25×4mm flat steel, clamps made of sugar tin and 6mm multi-strand copper core polyvinyl fluoride wire (or 25×4mm fan steel).
(8) The shielding wire of the entire non-conductive pipeline can be connected in sections to the grounded metal support of the pipeline. All metal parts of the pipe section should be connected to the grounded support or connected to the grounding wire as close as possible. (9) Hoses in the pipeline network should use metal spiral wires or metal protective nets as much as possible. The metal spiral wires, metal protective nets and hardware at both ends of the hoses should be connected to each other and grounded at one end. Conductive rubber hoses and rigid insulating pipes coated with conductive paint should be equipped with metal hoops that are tightly combined with them. C3.2.3 (7) Grounding. 3.3 Loading and unloading platforms and docks with electrostatic hazards 3.3.1 All pipelines, equipment, metal bodies of buildings (structures) and railway rails (except those for cathodic protection) in loading and unloading platforms and docks should be connected to form an electrical path and grounded. 3.3.2 For loading and unloading platforms (ship positions) on roads, railways and docks, static grounding trunk lines and grounding bodies should be set up. At least one set of grounding bodies at docks should be set up on land. 3.3.3 Loading and unloading platforms and docks should select appropriate locations to set up several grounding terminal strips and exposed metal bodies.
3.3.4 In the loading and unloading operation area, the rail ends of the railway rails need to be grounded. The connecting wire can be selected from two 5mm galvanized iron wires and riveted into the rails with plug nails. Parallel rails can be bridged with 1×19-14, 9mm galvanized steel strands. The bridge point should be selected at the corresponding position of the static grounding body on both sides of the loading and unloading operation area and directly connected to the grounding body. 3.3.5 The dock approach bridge, extension ship, etc. should be connected to each other and grounded at two locations. The connecting wire can be selected from 35mm multi-strand copper core insulated wires. The fixed pier of the dock, the pier steel bars should be connected to the metal body of the pier. . 3.4 Moving objects that can generate static electricity hazards 3.4.1 The car should carry a special grounding cable with one end connected to the car body, so that the car can be grounded after it is in place and before loading and unloading operations. You can also use the connection line prepared at the grounding site to connect to the connection end of the car tank car. The grounding method can be fastened with bolts or clamped with a suitable clamp. The connection end of the car tank car should be welded to the car body that is not easily damaged and far away from the material outlet. 8.3 In places where there are electrostatic hazards, anti-static floors or conductive floors should be laid. The leakage resistance of the floor in general places should be less than 102. In explosive hazardous environments, the leakage resistance of the floor should be less than 10°9. To prevent electric shock accidents caused by low-voltage power electricity, the leakage resistance of the conductive rubber sheet should be greater than 3×10*0. 2.9.4 Outside the entrance of an explosive hazardous environment where electrostatic hazards may occur, grounded exposed metal bodies such as railings, metal doors, metal brackets, etc. should be installed. 2.9.5 Operators should take the following measures in places where electrostatic hazards may occur (1) They should use various anti-static protective equipment correctly, such as anti-static shoes, anti-static work clothes, anti-static gloves, etc., and should not wear chemical fiber clothing.
(2) The work surface should be laid with a conductive rubber sheet, and the seat of the stool should be made of conductive material. If the legs of the work table and stool are made of non-metallic materials or have plastic (rubber) feet, the table and seat should be grounded. (3) In addition to complying with the requirements of 2.9.3, the floor should be regularly sprinkled with water and cleaned of insulating dirt. (4) In order to conduct away the static electricity brought by the human body from the outside world, before entering the site, the operator should hold the grounded metal body set up according to the requirements of 2.9.4 with bare hands or bare hands wearing anti-static gloves. (5) In places such as gunpowder processing rooms, operators should wear grounded conductive wrist straps, leg straps and use conductive aprons.
2.10 Electrostatic grounding of computer rooms and electronic instruments 2.10.1 When using anti-static raised floors in computer (electronic instrument) rooms, they should be electrostatically grounded to provide a good electrical path for the discharge of static electricity.
2.10.2 Anti-static floors can also be laid in computer (electronic instrument) rooms. In rooms with window air conditioners, the walls6
should be made of anti-static wall surfaces, and the doors should also be made of anti-static materials. 2.10.3 It is strictly forbidden to lay ordinary acrylic, nylon and other chemical fiber carpets or ordinary rubber mats on the floor of the computer (electronic instrument) room. If you want to lay carpets, you must use anti-static carpets. 2.10.4 The static grounding electrode of the computer (electronic instrument) room should be far away from the lightning protection grounding electrode. 3 Specific provisions
3.1 Fixed equipment
3.1.1 If the metal body of the fixed equipment (including pipelines) has grounding for lightning protection, stray current protection, etc., it is not necessary to make additional static grounding. The static grounding of the metal body of the equipment in the production device area should be connected into a network. 3.1.2 The grounding connection terminal can be set on the side of the equipment, or on the side or end of the metal support that is connected to the equipment as a whole. The general height of the installation can be 100 to 200 mm above the bolt seat. The terminal structure and orientation should comply with the provisions of 2 and 4.
3.1.3 The grounding branch line and flexible connection line are recommended to be selected according to Table 3.1.3. 3.1.3
Grounding branch line
Flexible connecting line
Grounding branch line, flexible connecting line material selection table Round steel 10mm, flat steel 20.×4mm
Multi-strand copper core insulated wire, 16mm
Bare copper soft stranded wire, 16mm
3.1.4 On the sampling operation table of the tank, a set of grounding terminals should be set on both sides of the operation port to ground the sampling rope, measuring rod and other tools in the upwind direction. The terminal position should be set where it does not hinder the operation. When the floating metal tank top has no lightning protection grounding, the tank top should be connected to the tank body with a flexible connecting line, and the connection points should not be less than two. The flexible connecting line should be selected from bare copper soft stranded wire with a cross-section of not less than 25mm. The metal float inside the storage tank must be connected to the tank body. ：.When the inner wall of the storage is painted, the conductivity of the paint should be higher than that of the stored liquid, and its resistivity should be below 10*9·m. 3.1.5 Metal parts insulated from the ground, such as bolts, flanges, etc., should be connected to the ground. 3.1.6 In order to eliminate static electricity on the human body, a grounding metal rod should be installed at the entrance of the tower ladder, or a one-meter-long exposed metal surface should be left on the grounded metal railing. 3.2 Pipeline network system
3.2.1 The grounding connection point of the pipeline network should meet the following requirements: (1) The pipelines in each relatively independent building (structure) in the device area can be electrostatically grounded by connecting to the metal shell of the process equipment (flange connection). (2) Grounding connection points should be set at pumps, filters, buffers, etc. in the pipeline network. (3) Pipes in the pipeline network should be grounded at the entry and exit areas, the boundaries of non-explosive hazardous environments, and the pipeline bifurcations. For long-distance non-branched pipelines, they should be reliably connected to the grounding body every 80 to 100 meters. If the grounding resistance value of the pipe rack meets 2.3.1, it can also be used as a grounding body. (4) For non-conductive pipe sections in the middle of metal piping (such as polyvinyl nitride pipes), in addition to shielding protection, the metal pipes at both ends should be connected to the grounding wire respectively, or 6mm3 multi-strand copper core insulated wires should be used for cross-connection and grounding. : (5) Metal parts on non-conductive pipe sections should be grounded. 3.2.2 Metal pipe sections used for cathodic protection shall not be grounded for electrostatics. 3.2.3 The specific methods of electrostatic grounding shall meet the following requirements: (1) Connecting terminals should be set on the pipe wall or pipe support for connection between pipes or between pipes and grounding branches and wires. Fixed pipe supports can also be used for grounding. (2) The steel pipe rack can be used as the conductor of the ground connection system, and the connection end can be welded on the pipe rack. (3) The ground and non-direct buried pipelines should be connected to the ground branch line with flexible connection and fastened with bolts. The connection line should be 6mm? multi-strand copper core PVC wire, and its length should have a margin of not less than 100mm. (4) The underground pipeline should use 40×4mm galvanized flat steel as the branch line, and use welding to connect with the grounding bull wire. The branch line should have a margin of not less than 100mm and be twisted 90 degrees in a plane. (5) When the protective cover of the air duct and the insulation layer is made of thin metal plate, it should be connected to each other by soldering or mechanically fixed bolts. The soldering length between the metal plates should be greater than 100mm. (6) In addition to using binding wire to connect the process pipeline and the heating companion pipe, the steam inlet and return water outlet of the companion pipe should also be connected to the support of the process pipeline. (7) Cast iron socket pipes should be connected with 25×4mm flat steel, clamps made of sugar tin and 6mm multi-strand copper core polyvinyl fluoride wire (or 25×4mm fan steel).
(8) The shielding wire of the entire non-conductive pipeline can be connected in sections to the grounded metal support of the pipeline. All metal parts of the pipe section should be connected to the grounded support or connected to the grounding wire as close as possible. (9) Hoses in the pipeline network should use metal spiral wires or metal protective nets as much as possible. The metal spiral wires, metal protective nets and hardware at both ends of the hoses should be connected to each other and grounded at one end. Conductive rubber hoses and rigid insulating pipes coated with conductive paint should be equipped with metal hoops that are tightly combined with them. C3.2.3 (7) Grounding. 3.3 Loading and unloading platforms and docks with electrostatic hazards 3.3.1 All pipelines, equipment, metal bodies of buildings (structures) and railway rails (except those for cathodic protection) in loading and unloading platforms and docks should be connected to form an electrical path and grounded. 3.3.2 For loading and unloading platforms (ship positions) on roads, railways and docks, static grounding trunk lines and grounding bodies should be set up. At least one set of grounding bodies at docks should be set up on land. 3.3.3 Loading and unloading platforms and docks should select appropriate locations to set up several grounding terminal strips and exposed metal bodies.
3.3.4 In the loading and unloading operation area, the rail ends of the railway rails need to be grounded. The connecting wire can be selected from two 5mm galvanized iron wires and riveted into the rails with plug nails. Parallel rails can be bridged with 1×19-14, 9mm galvanized steel strands. The bridge point should be selected at the corresponding position of the static grounding body on both sides of the loading and unloading operation area and directly connected to the grounding body. 3.3.5 The dock approach bridge, extension ship, etc. should be connected to each other and grounded at two locations. The connecting wire can be selected from 35mm multi-strand copper core insulated wires. The fixed pier of the dock, the pier steel bars should be connected to the metal body of the pier. . 3.4 Moving objects that can generate static electricity hazards 3.4.1 The car should carry a special grounding cable with one end connected to the car body, so that the car can be grounded after it is in place and before loading and unloading operations. You can also use the connection line prepared at the grounding site to connect to the connection end of the car tank car. The grounding method can be fastened with bolts or clamped with a suitable clamp. The connection end of the car tank car should be welded to the car body that is not easily damaged and far away from the material outlet. 8.3 In places where there are electrostatic hazards, anti-static floors or conductive floors should be laid. The leakage resistance of the floor in general places should be less than 102. In explosive hazardous environments, the leakage resistance of the floor should be less than 10°9. To prevent electric shock accidents caused by low-voltage power electricity, the leakage resistance of the conductive rubber sheet should be greater than 3×10*0. 2.9.4 Outside the entrance of an explosive hazardous environment where electrostatic hazards may occur, grounded exposed metal bodies such as railings, metal doors, metal brackets, etc. should be installed. 2.9.5 Operators should take the following measures in places where electrostatic hazards may occur (1) They should use various anti-static protective equipment correctly, such as anti-static shoes, anti-static work clothes, anti-static gloves, etc., and should not wear chemical fiber clothing.
(2) The work surface should be laid with a conductive rubber sheet, and the seat of the stool should be made of conductive material. If the legs of the work table and stool are made of non-metallic materials or have plastic (rubber) feet, the table and seat should be grounded. (3) In addition to complying with the requirements of 2.9.3, the floor should be regularly sprinkled with water and cleaned of insulating dirt. (4) In order to conduct away the static electricity brought by the human body from the outside world, before entering the site, the operator should hold the grounded metal body set up according to the requirements of 2.9.4 with bare hands or bare hands wearing anti-static gloves. (5) In places such as gunpowder processing rooms, operators should wear grounded conductive wrist straps, leg straps and use conductive aprons.
2.10 Electrostatic grounding of computer rooms and electronic instruments 2.10.1 When using anti-static raised floors in computer (electronic instrument) rooms, they should be electrostatically grounded to provide a good electrical path for the discharge of static electricity.
2.10.2 Anti-static floors can also be laid in computer (electronic instrument) rooms. In rooms with window air conditioners, the walls6
should be made of anti-static wall surfaces, and the doors should also be made of anti-static materials. 2.10.3 It is strictly forbidden to lay ordinary acrylic, nylon and other chemical fiber carpets or ordinary rubber mats on the floor of the computer (electronic instrument) room. If you want to lay carpets, you must use anti-static carpets. 2.10.4 The static grounding electrode of the computer (electronic instrument) room should be far away from the lightning protection grounding electrode. 3 Specific provisions
3.1 Fixed equipment
3.1.1 If the metal body of the fixed equipment (including pipelines) has grounding for lightning protection, stray current protection, etc., it is not necessary to make additional static grounding. The static grounding of the metal body of the equipment in the production device area should be connected into a network. 3.1.2 The grounding connection terminal can be set on the side of the equipment, or on the side or end of the metal support that is connected to the equipment as a whole. The general height of the installation can be 100 to 200 mm above the bolt seat. The terminal structure and orientation should comply with the provisions of 2 and 4.
3.1.3 The grounding branch line and flexible connection line are recommended to be selected according to Table 3.1.3. 3.1.3
Grounding branch line
Flexible connecting line
Grounding branch line, flexible connecting line material selection table Round steel 10mm, flat steel 20.×4mm
Multi-strand copper core insulated wire, 16mm
Bare copper soft stranded wire, 16mm
3.1.4 On the sampling operation table of the tank, a set of grounding terminals should be set on both sides of the operation port to ground the sampling rope, measuring rod and other tools in the upwind direction. The terminal position should be set where it does not hinder the operation. When the floating metal tank top has no lightning protection grounding, the tank top should be connected to the tank body with a flexible connecting line, and the connection points should not be less than two. The flexible connecting line should use a bare copper soft stranded wire with a cross-section of not less than 25mm. The metal float inside the storage tank must be connected to the tank body. ：.When the inner wall of the storage is painted, the conductivity of the paint should be higher than that of the stored liquid, and its resistivity should be below 10*9·m. 3.1.5 Metal parts insulated from the ground, such as bolts, flanges, etc., should be connected to the ground. 3.1.6 In order to eliminate static electricity on the human body, a grounding metal rod should be installed at the entrance of the tower ladder, or a one-meter-long exposed metal surface should be left on the grounded metal railing. 3.2 Pipeline network system
3.2.1 The grounding connection point of the pipeline network should meet the following requirements: (1) The pipelines in each relatively independent building (structure) in the device area can be electrostatically grounded by connecting to the metal shell of the process equipment (flange connection). (2) Grounding connection points should be set at pumps, filters, buffers, etc. in the pipeline network. (3) Pipes in the pipeline network should be grounded at the entry and exit areas, the boundaries of non-explosive hazardous environments, and the pipeline bifurcations. For long-distance non-branched pipelines, they should be reliably connected to the grounding body every 80 to 100 meters. If the grounding resistance value of the pipe rack meets 2.3.1, it can also be used as a grounding body. (4) For non-conductive pipe sections in the middle of metal piping (such as polyvinyl nitride pipes), in addition to shielding protection, the metal pipes at both ends should be connected to the grounding wire respectively, or 6mm3 multi-strand copper core insulated wires should be used for cross-connection and grounding. : (5) Metal parts on non-conductive pipe sections should be grounded. 3.2.2 Metal pipe sections used for cathodic protection shall not be grounded for electrostatics. 3.2.3 The specific methods of electrostatic grounding shall meet the following requirements: (1) Connecting terminals should be set on the pipe wall or pipe support for connection between pipes or between pipes and grounding branches and wires. Fixed pipe supports can also be used for grounding. (2) The steel pipe rack can be used as the conductor of the ground connection system, and the connection end can be welded on the pipe rack. (3) The ground and non-direct buried pipelines should be connected to the ground branch line with flexible connection and fastened with bolts. The connection line should be 6mm? multi-strand copper core PVC wire, and its length should have a margin of not less than 100mm. (4) The underground pipeline should use 40×4mm galvanized flat steel as the branch line, and use welding to connect with the grounding bull wire. The branch line should have a margin of not less than 100mm and be twisted 90 degrees in a plane. (5) When the protective cover of the air duct and the insulation layer is made of thin metal plate, it should be connected to each other by soldering or mechanically fixed bolts. The soldering length between the metal plates should be greater than 100mm. (6) In addition to using binding wire to connect the process pipeline and the heating companion pipe, the steam inlet and return water outlet of the companion pipe should also be connected to the support of the process pipeline. (7) Cast iron socket pipes should be connected with 25×4mm flat steel, clamps made of sugar tin and 6mm multi-strand copper core polyvinyl fluoride wire (or 25×4mm fan steel).
(8) The shielding wire of the entire non-conductive pipeline can be connected in sections to the grounded metal support of the pipeline. All metal parts of the pipe section should be connected to the grounded support or connected to the grounding wire as close as possible. (9) Hoses in the pipeline network should use metal spiral wires or metal protective nets as much as possible. The metal spiral wires, metal protective nets and hardware at both ends of the hoses should be connected to each other and grounded at one end. Conductive rubber hoses and rigid insulating pipes coated with conductive paint should be equipped with metal hoops that are tightly combined with them. C3.2.3 (7) Grounding. 3.3 Loading and unloading platforms and docks with electrostatic hazards 3.3.1 All pipelines, equipment, metal bodies of buildings (structures) and railway rails (except those for cathodic protection) in loading and unloading platforms and docks should be connected to form an electrical path and grounded. 3.3.2 For loading and unloading platforms (ship positions) on roads, railways and docks, static grounding trunk lines and grounding bodies should be set up. At least one set of grounding bodies at docks should be set up on land. 3.3.3 Loading and unloading platforms and docks should select appropriate locations to set up several grounding terminal strips and exposed metal bodies.
3.3.4 In the loading and unloading operation area, the rail ends of the railway rails need to be grounded. The connecting wire can be selected from two 5mm galvanized iron wires and riveted into the rails with plug nails. Parallel rails can be bridged with 1×19-14, 9mm galvanized steel strands. The bridge point should be selected at the corresponding position of the static grounding body on both sides of the loading and unloading operation area and directly connected to the grounding body. 3.3.5 The dock approach bridge, extension ship, etc. should be connected to each other and grounded at two locations. The connecting wire can be selected from 35mm multi-strand copper core insulated wires. The fixed pier of the dock, the pier steel bars should be connected to the metal body of the pier. . 3.4 Moving objects that can generate static electricity hazards 3.4.1 The car should carry a special grounding cable with one end connected to the car body, so that the car can be grounded after it is in place and before loading and unloading operations. You can also use the connection line prepared at the grounding site to connect to the connection end of the car tank car. The grounding method can be fastened with bolts or clamped with a suitable clamp. The connection end of the car tank car should be welded to the car body that is not easily damaged and far away from the material outlet. 8.3. In addition to the provisions, watering and insulating dirt should be regularly removed. (4) In order to conduct away the static electricity brought by the human body from the outside world, before entering the site, the operator should hold the grounded metal body set up according to the requirements of 2.9.4 with bare hands or bare hands wearing anti-static gloves. (5) In places such as gunpowder processing rooms, operators should wear grounded conductive wrist straps, leg straps and conductive aprons.
2.10 Electrostatic grounding of computer rooms and electronic instruments 2.10.1 When using anti-static raised floors in computer (electronic instrument) rooms, they should be electrostatically grounded to provide a good electrical path for the discharge of static electricity. bzxZ.net
2.10.2 Anti-static floors can also be laid in computer (electronic instrument) rooms. In rooms with window air conditioners, the walls6
should be made of anti-static wall surfaces, and the doors should also be made of anti-static materials. 2.10.3 It is strictly forbidden to lay ordinary acrylic, nylon and other chemical fiber carpets or ordinary rubber mats on the floor of computer (electronic instrument) rooms. If you want to lay carpets, you must use anti-static carpets. 2.10.4 The static grounding electrode in the computer (electronic instrument) room should be far away from the lightning protection grounding electrode. 3 Specific provisions
3.1 Fixed equipment
3.1.1 If the metal body of the fixed equipment (including pipelines) has grounding for lightning protection, stray current protection, etc., it is not necessary to make additional static grounding. The static grounding of the metal body of the equipment in the production device area should be connected into a network. 3.1.2 The grounding connection terminal can be set on the side of the equipment, or on the side or end of the metal support that is connected to the equipment as a whole. The general height of the installation can be 100 to 200 mm above the bolt seat. The terminal structure and orientation should comply with the provisions of 2 and 4.
3.1.3 It is recommended to select grounding branches and flexible connecting lines according to Table 3.1.3. 3.1.3
Grounding branch line
Flexible connecting line
Grounding branch line, flexible connecting line material selection table Round steel 10mm, flat steel 20.×4mm
Multi-strand copper core insulated wire, 16mm
Bare copper soft stranded wire, 16mm
3.1.4 On the sampling operation table of the tank, a set of grounding terminals should be set on both sides of the operation port to ground the sampling rope, measuring rod and other tools in the upwind direction. The terminal position should be set where it does not hinder the operation. When the floating metal tank top has no lightning protection grounding, the tank top should be connected to the tank body with a flexible connecting line, and the connection points should not be less than two. The flexible connecting line should be selected from bare copper soft stranded wire with a cross-section of not less than 25mm. The metal float inside the storage tank must be connected to the tank body. ：.When the inner wall of the storage is painted, the conductivity of the paint should be higher than that of the stored liquid, and its resistivity should be below 10*9·m. 3.1.5 Metal parts insulated from the ground, such as bolts, flanges, etc., should be connected to the ground. 3.1.6 In order to eliminate static electricity on the human body, a grounding metal rod should be installed at the entrance of the tower ladder, or a one-meter-long exposed metal surface should be left on the grounded metal railing. 3.2 Pipeline network system
3.2.1 The grounding connection point of the pipeline network should meet the following requirements: (1) The pipelines in each relatively independent building (structure) in the device area can be electrostatically grounded by connecting to the metal shell of the process equipment (flange connection). (2) Grounding connection points should be set at pumps, filters, buffers, etc. in the pipeline network. (3) Pipes in the pipeline network should be grounded at the entry and exit areas, the boundaries of non-explosive hazardous environments, and the pipeline bifurcations. For long-distance non-branched pipelines, they should be reliably connected to the grounding body every 80 to 100 meters. If the grounding resistance value of the pipe rack meets 2.3.1, it can also be used as a grounding body. (4) For non-conductive pipe sections in the middle of metal piping (such as polyvinyl nitride pipes), in addition to shielding protection, the metal pipes at both ends should be connected to the grounding wire respectively, or 6mm3 multi-strand copper core insulated wires should be used for cross-connection and grounding. : (5) Metal parts on non-conductive pipe sections should be grounded. 3.2.2 Metal pipe sections used for cathodic protection shall not be grounded for electrostatics. 3.2.3 The specific methods of electrostatic grounding shall meet the following requirements: (1) Connecting terminals should be set on the pipe wall or pipe support for connection between pipes or between pipes and grounding branches and wires. Fixed pipe supports can also be used for grounding. (2) The steel pipe rack can be used as the conductor of the ground connection system, and the connection end can be welded on the pipe rack. (3) The ground and non-direct buried pipelines should be connected to the ground branch line with flexible connection and fastened with bolts. The connection line should be 6mm? multi-strand copper core PVC wire, and its length should have a margin of not less than 100mm. (4) The underground pipeline should use 40×4mm galvanized flat steel as the branch line, and use welding to connect it to the grounding bull wire. The branch line should have a margin of not less than 100mm and be twisted 90 degrees in a plane. (5) When the protective cover of the air duct and the insulation layer is made of thin metal plates, it should be connected to each other by soldering or mechanically fixed bolts. The soldering length between the metal plates should be greater than 100mm. (6) In addition to using binding wire to connect the process pipeline and the heating companion pipe, the steam inlet and return water outlet of the companion pipe should also be connected to the support of the process pipeline. (7) Cast iron socket pipes should be connected with 25×4mm flat steel, clamps made of sugar tin and 6mm multi-strand copper core polyvinyl fluoride wire (or 25×4mm fan steel).
(8) The shielding wire of the entire non-conductive pipeline can be connected in sections to the grounded metal support of the pipeline. All metal parts of the pipe section should be connected to the grounded support or connected to the grounding wire as close as possible. (9) Hoses in the pipeline network should use metal spiral wires or metal protective nets as much as possible. The metal spiral wires, metal protective nets and hardware at both ends of the hoses should be connected to each other and grounded at one end. Conductive rubber hoses and rigid insulating pipes coated with conductive paint should be equipped with metal hoops that are tightly combined with them. C3.2.3 (7) Grounding. 3.3 Loading and unloading platforms and docks with electrostatic hazards 3.3.1 All pipelines, equipment, metal bodies of buildings (structures) and railway rails (except those for cathodic protection) in loading and unloading platforms and docks should be connected to form an electrical path and grounded. 3.3.2 For loading and unloading platforms (ship positions) on roads, railways and docks, static grounding trunk lines and grounding bodies should be set up. At least one set of grounding bodies at docks should be set up on land. 3.3.3 Loading and unloading platforms and docks should select appropriate locations to set up several grounding terminal strips and exposed metal bodies.
3.3.4 In the loading and unloading operation area, the rail ends of the railway rails need to be grounded. The connecting wire can be selected from two 5mm galvanized iron wires and riveted into the rails with plug nails. Parallel rails can be bridged with 1×19-14, 9mm galvanized steel strands. The bridge point should be selected at the corresponding position of the static grounding body on both sides of the loading and unloading operation area and directly connected to the grounding body. 3.3.5 The dock approach bridge, extension ship, etc. should be connected to each other and grounded at two locations. The connecting wire can be selected from 35mm multi-strand copper core insulated wires. The fixed pier of the dock, the pier steel bars should be connected to the metal body of the pier. . 3.4 Moving objects that can generate static electricity hazards 3.4.1 The car should carry a special grounding cable with one end connected to the car body, so that the car can be grounded after it is in place and before loading and unloading operations. You can also use the connection line prepared at the grounding site to connect to the connection end of the car tank car. The grounding method can be fastened with bolts or clamped with a suitable clamp. The connection end of the car tank car should be welded to the car body that is not easily damaged and far away from the material outlet. 8.3. In addition to the provisions, watering and insulating dirt should be regularly removed. (4) In order to conduct away the static electricity brought by the human body from the outside world, before entering the site, the operator should hold the grounded metal body set up according to the requirements of 2.9.4 with bare hands or bare hands wearing anti-static gloves. (5) In places such as gunpowder processing rooms, operators
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