The effect of electrostatic jumper
Electrostatic jumper is used to eliminate static electricity and prevent the generation of electrostatic sparks. Use metal with good conductivity to connect two flanges or valve flanges. , The pipeline is grounded, the flange is generally made of anti-corrosion, resulting in poor contact and easy to produce sparks. In order to prevent accidents, the flange is bridged to provide a discharge channel for the generated electric charge.
1. Where do electrostatic jumpers need to be done?
1. "Design Regulations for Electrostatic Grounding of Chemical Enterprises" (HG/T 20675-1990)
3.4.4 All kinds of flammable containers, such as barrels, explosive bottles, etc. , Should be placed on a conductive floor, the conductive floor should be free of insulating grease, and connected to the grounding wire. For carts with wheels, the wheels should be made of conductive materials. Application connecting wires such as platform scales and ground scales used for measurement are connected to the grounding trunk wires. Small containers should be connected to the grounding trunk with battery clips and jumper wires.
3.4.5 The belt of the belt conveyor should be made of conductive material as far as possible. When the belt is insulating, the joints of the belt should not use metal materials. The belt cover must be grounded and fixed firmly, and it must not be scratched with the belt.
2. "Petrochemical Electrostatic Grounding Design Specification" (SH/T 3097-2017)
4.1.1 In the process of production, processing, storage and transportation,When equipment, pipelines, operating tools, and human bodies are likely to generate and accumulate static electricity and cause static electricity hazards, electrostatic grounding measures should be taken.
5.1.1 The shells of fixed equipment (towers, containers, pumps, heat exchangers, filters, etc.) should be electrostatically grounded. Earth-covering equipment generally does not need to be grounded statically.
III. "Code for Design of Petroleum Depots" (GB 50074-2014)
14.3.8 Automobile tankers or barrel filling facilities for Class A, B and C liquids should be installed with tankers or barrels anti-static grounding device connected.
14.3.9 Inflammable and combustible liquid loading and unloading docks, anti-static grounding devices that bridge the ship should be provided.
4. " Petrochemical Industry Design Fire Protection Code" (GB 50160-2008)
9.3.1 For equipment and pipelines that may generate static electricity in explosion and fire hazard areas, Take grounding measures.
9.3.2 An electrostatic grounding system shall be installed in the polyolefin resin processing system, conveying system and silo area, and there shall be no ungrounded isolated conductors.
9.3.5 Automobile tank cars, railway tank cars and loading and unloading platforms shall be equipped with special grounding wires for static electricity.
5. "Specifications for design of boiler room " (GB 50041-2008)
15.2.17 Gas and liquid fuel pipelines should be equipped with electrostatic grounding devices.
6. "Code for Design of Foam Fire Extinguishing System" (GB 50151-2010)
3.7.10 For dry pipelines installed on the ground or in pipe trenches in explosion-proof areas, anti-static should be adopted Grounding measures.
7. "Code for Design of Dry Powder Fire Extinguishing System" (GB 50347-2004)
7.0.7 When the system pipeline is installed in an explosion-hazardous place, the metal parts of the pipeline network should be grounded against static electricity.
8. "Code for Design of Oil and Gas Recovery Facilities for Oil Loading System" (GB 50759-2012)
9.1.1 Electrostatic grounding devices should be installed for oil pipelines, equipment and casings in oil and gas recovery facilities .
9. "Code for Design of Producer Gas Stations" (GB 50159-2013)
17.0.5 The gas pipeline should be equipped with a grounding device to remove static electricity.
10. "Code for Design of Clean Workshops in the Pharmaceutical Industry" (GB 50457-2008)
6.4.2 Pipelines for conveying flammable media. Grounding facilities should be installed to remove static electricity.
9.5.3 The clean room air conditioning system should take anti-static grounding measures.
11.4.3 The clean air conditioning system of the medical clean room (area) should take anti-static grounding measures.
11. "Code for Design of Printing and Dyeing Factory" (GB 50426-2016)
8.4.6 The ventilation system used in explosion-dangerous rooms should have reliable anti-static grounding measures.
12. " General Guidelines for the Prevention of Static Electricity Accidents" (GB 12158-2006)
6.4.10 The equipment that collects and filters powders should be used for collecting and filtering static electricity. Materials and grounded.
13. "Technical Specification for Inert Gas Fire Extinguishing System" (CECS 312:2012)
6.0.5 All pipeline systems that pass through explosion hazard, substation and power distribution places should be done Anti-static grounding.
14. "Technical Specifications for Hydrogen Refueling Stations" (GB 50516-2010)
10.3.4 Anti-static grounding devices should be installed near the hydrogen refueling machine and the hydrogen refueling machine.
15. " Chemical Industry Wastewater Treatment and Reuse Design Specification" (GB 50684-2011)
,And should be equipped with anti-static grounding facilities.
16. "Code for Construction and Quality Acceptance of Anti-static Projects" (GB 50944-2013)
3.0.2 Anti-static grounding devices should be preset during civil construction.
17. "Code for Design of Gas Fire Extinguishing System" (GB 50370-2005)
6.0.6 Passing through the pipe network in places where there is a danger of explosion, power transformation, distribution room, etc. Metal parts such as the shell should be grounded against static electricity.
18. "Pressure Pipeline Safety Technical Supervision Regulations—Industrial Piping" (TSGD0001－2009)
Article 80 has the following provisions for the anti-static connection of flanges: those with electrostatic grounding requirements For piping, the resistance between each connection joint and the resistance to earth of the piping system should be measured.
19. When the value exceeds the "Pressure Piping Specification—Industrial Piping" (GB/T20801-2006) or the design documents, a jumper wire should be set (in the flange or threaded joint) Between) and ground lead. It can be seen from this article whether the flange needs to be connected to the wire, the resistance value between the flanges needs to be measured, and when the resistance value exceeds the specified value, it needs to be connected.
20. "Specifications for Pressure Piping—Industrial Piping Part 4 Production and Installation" (GB/T20801.4-2006)
Article 10.12.1: Pipes with electrostatic grounding requirements ,There should be good electrical conduction between the segments. When the resistance value between each pair of flanges or threaded joints is greater than 0.03Ω, a wire jumper should be set.
21. "Code for Construction of Industrial Metal Piping Engineering" (GB 50235—2010)
Article 7.13.1 stipulates that the pipes with electrostatic grounding requirements shall be designed for each pair of flanges or other When the resistance value between the joints exceeds 0.03 ohms, a wire jumper should be set up. It can be seen whether the industrial pipeline metal flange is jumped, and the resistance value between the flanges needs to be measured. When the resistance between the flanges exceeds 0.03Ω, a wire jumper should be set.
2. How to do electrostatic jumper?
"Chemical Enterprise Electrostatic Grounding Design Technical Regulations" (HGJ28-90) The current serial number is changed to HG/T20675-1990. Article 2.7.5 of the regulation stipulates that when the metal flange is fastened by metal bolts or clamps, it is not necessary to install an electrostatic connection wire under normal circumstances. Under corrosive conditions, it is necessary to ensure that there are at least two contact surfaces between bolts or clamps, rust and grease removal before installation, and anti-loosening nuts are added during installation.
"Chemical Enterprise Electrostatic Grounding Design Technical Specification Compilation Instructions" explains Article 2.7.5 as follows: From the practical experience of many units, one of the metal flanges connected by metal bolts In the meantime, the bolt connection alone has sufficient electrostatic conductivity.Installation requirements under corrosive conditions to ensure continuity.
"Petrochemical Electrostatic Grounding Design Code" (SH3097-2000) as an enterprise standard, stricter than national and industry standards. Article 4.3.3 of the code stipulates that when metal flanges are fastened by metal bolts or clamps on the piping system, it is generally not necessary to install an electrostatic connection wire, but it should be ensured that there is a good connection between at least two bolts or clamps. Conductive contact surface.
Article 14.2.14 of "Code for Design of Petroleum Depots" (GB 50074-2002) stipulates that the flange joints of oil (oil and gas) pipelines should be bridged. When no less than 5 bolts are connected, they may not be bridged in a non-corrosive environment.
"Specifications for Design and Construction of Automobile Refueling Stations" (GB 50156-2002) Article 10.3.3 stipulates: oil, liquefied petroleum gas and natural gas pipelines in explosion hazard areas Metal wire should be used to bridge the joints of flanges, hose ends and other joints. When the flange has no less than 5 connecting bolts, it is not necessary to bridge in a non-corrosive environment.
Article 6.12.2 of GB50235-97 "Code for Construction and Acceptance of Industrial Metal Pipelines" stipulates that when the resistance value of the pipeline system to ground exceeds 100Ω, two grounding leads should be provided. The ground lead should be welded.
SH3501-2002 "Petrochemical toxic and combustible medium construction and acceptance specification": Article 6.2.16 of the stainless steel pipeline with electrostatic grounding requirements, the wire jumper or grounding lead should be made of stainless steel plate transition, not with Stainless steel pipe is directly connected.
mounted CD90B4-88 reference to FIG
three, electrostatic (ESD) What exactly is
ESD (Electro-Static discharge) means "electrostatic discharge". ESD is a discipline formed since the middle of the 20th century to study the generation, harm and protection of static electricity. Therefore, it is customary in the world to refer to equipment used for electrostatic protection as ESD.
The generation of static electricity
Induction etc. The characteristics of static electricity are long-term accumulation, high voltage, low power, small current and short action time.
the movement of the human body or the contact with other objects,Factors such as separation, friction or induction can generate thousands of volts or even tens of thousands of volts of static electricity.
Static electricity causes serious harm in many areas. friction electrification and human body static are two major hazards in the electronics industry, which often cause unstable operation or even damage to electronic and electrical products.
The main measures of static electricity protection in the production process are static leakage, dissipation, neutralization, humidification, shielding and grounding.
The human body electrostatic protection system is mainly composed of anti-static wrist strap , ankle strap, heel strap, work clothes, footwear, caps, gloves or finger cots, etc. It has static discharge. And and shielding and other functions.
Electrostatic protection is a long-term systematic project. Any error or omission in any link will cause the failure of electrostatic protection.
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