Technical specifications for the inspection of lightning protection system in explosive and fire haz
Some standard content:
Meteorological Industry Standard of the People's Republic of China
Lightning protection device in explosive and fire hazardous atmosphere
Technical specifications for the inspection of lightning protection system in explosive and fire hazardous atmospherePublished
People's Republic of China
Meteorological Industry Standard
Technical specifications for the inspection of lightning protection system in explosive and fire hazardous atmosphereQXT1102009
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Normative reference documents
Terms and definitions
General provisions
Lightning protection classification
Basic requirements and working procedures for detection
Detection cycle
Detection content and technical requirements
Lightning arrester||tt ||Down conductor
Grounding device
Equipotential bonding
Electromagnetic shielding
Surge protector SPD
Antistatic grounding device
Requirements for test resistance
Appendix A Normative appendix
Appendix B Normative appendix
Appendix C
Informative appendix
Appendix D Informative appendix
Appendix E
Normative appendix
Appendix F Informative appendix
Appendix G Normative appendix
Appendix H Informative appendix
Appendix I Informative appendix
Explosion and fire environment zones
Thunder Division of electric protection zones
Sample format of on-site survey form
Sample format of original record form
Technical requirements for lightning protection devices
Method for measuring grounding resistance value
Classification of production sites and storage and transportation sites
Specification requirements for anti-static grounding materials:
Conversion of impulse grounding resistance and power frequency grounding resistance 2009
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This standard is coordinated with the "Design Code for Lightning Protection Devices of Buildings" GB50057, "Design Code for Power Installations in Explosive and Fire Hazardous Environments" GB50058 and relevant lightning protection standards in terms of the detection of lightning protection devices and anti-static grounding devices. Appendices A, B, E and G of this standard are normative appendices, and Appendices C, D, F, H and I are informative appendices.
This standard is proposed by the National Technical Committee for Standardization of Meteorological Disaster Prevention and Mitigation (SAC/TC345). This standard is under the jurisdiction of the National Meteorological Disaster Prevention and Reduction Standardization Technical Committee (SAC/TC345). The drafting units of this standard are: Hubei Lightning Protection Center, Guangzhou Lightning Protection and Disaster Reduction Management Office. The main drafters of this standard are: Wang Xueliang, Liu Xuechun, Huang Kejian, Duan Zhenzhong, Ye Zhiming, Liu Dingqi, Yang Hui, Kuang Benhe, Yin Zhengwang. 1 Scope
Technical Specifications for Testing Lightning Protection Devices in Explosive and Fire Hazardous Environments 2009
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This standard specifies the lightning protection classification, basic testing requirements, work procedures, testing cycles, testing contents and technical requirements in the testing of lightning protection devices and anti-static grounding devices in explosive and fire hazardous environments. This standard applies to the testing of lightning protection devices and anti-static grounding devices in explosive and fire hazardous environments. Normative References
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated referenced documents, all subsequent amendments (excluding errata) or revised versions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to investigate whether the latest versions of these documents can be used. For any undated referenced documents, the latest versions apply to this standard. GB/T17949.1—2000
Guidelines for the measurement of soil resistivity, ground impedance and ground potential of grounding systems Part 1: Conventional measurements
GB50028—2006 Code for design of urban gas supply GB50057
Code for design of lightning protection for buildings
GB50058
Code for design of electrical installations for explosive and fire hazardous atmospheres GB50074—2002
GB50089—1998
GB50156—2002
GB50160—1992
GB50177—2005
GB50183—2004
GB50251—2003
G B50253—2003
GB50343—2004
Petroleum depot design specification
Safety specification for design of civil explosives factoryDesign and construction specification for automobile gas station (2006 edition)Design fire protection specification for petrochemical enterprises (1999 edition)Design specification for hydrogen station
Design fire protection specification for petroleum and natural gas engineering
Design specification for gas pipeline engineering
Design specification for oil pipeline engineering
Technical specification for lightning protection of electronic information system in buildingsSH3097-20007
Design specification for static grounding in petrochemical industry
3 Terms and definitions
In addition to the terms and definitions specified in the normative reference documents of this standard, the following terms and definitions apply to this standard. 3.1
explosive hazardous atmosphere
Area with explosion hazard due to the presence of explosive hazardous substances 3.2
Explosive gas atmosphereExplosive gas atmosphereAn environment containing explosive gas mixture. [Appendix 1 of GB50058]
Explosive dust environmentExplosive dust atmosphereAn environment containing explosive gas mixtures.
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Fire hazard environmentFire hazard atmosphereAn area where fire hazard substances exist and thus have fire hazard. [Appendix 1 of GB50058]
Lightning protection systemLightning protection systemLPSThe sum of lightning rods, down conductors, grounding devices, surge protectors and other connecting conductors. [Appendix 8 of GB50057]
Air-termination systemLightning rods, lightning strips (wires), lightning nets that directly intercept lightning strikes, and metal roofs and metal components used for lightning termination. [Appendix VIII of GB50057]
Down-conductor system
Metallic conductor connecting lightning arrester and grounding device. [Appendix VIII of GB50057]
Earth-termination systemThe sum of grounding body and grounding wire.
[Appendix VIII of GB50057]
Earthing electrode
Conductor buried in soil or concrete foundation for current dispersion. [Appendix VIII of GB50057]
Earthing conductor earthing conductor
Connecting conductor from down-conductor disconnect card or line change point to grounding body; or connecting conductor from grounding terminal, equipotential bonding strip to grounding body or grounding device.
[Appendix VIII of GB50057]
Lightning protection zone lightning protection zone LP7Those areas where the electromagnetic environment of lightning strikes needs to be specified and controlled. [GB50343-20042Terms
Equipotential bondingLightningequipotential bondingConnect separate metal objects to the lightning protection device directly with a connecting conductor or through a surge protector to reduce the potential difference caused by lightning current.
[GB50057 Appendix VIII
Equipotential bonding stripequipotentialbondingbarConnect metal devices, external conductive objects, power lines, telecommunication lines and other lines to it so that they can be connected to the lightning protection device at the same potentialMedicine type
Equipotential bonding networkequipotentialbondingnetwork2009
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A system that connects all conductive objects in buildings and systems within buildings (except live conductors) to the grounding device. [GB50057 Appendix VIII
Electromagnetic shieldingelectromagnetic shielding that uses conductive materials to reduce the penetration of alternating electromagnetic fields into designated areas. [GB50343-20042 Terminology]
surgeprotectivedeviceSPD
Surgeprotectivedevice
A device designed to limit transient overvoltage and divert surge current. It contains at least one nonlinear element. [GB50057 Appendix VIII
ElectrostaticearthingsystemAn external channel for the charge on a charged body to leak and dissipate to the earth. [SH3097-20002 Terminology
DirectstaticearthingA way of grounding an object through a metal conductor, [SH3097-20002 Terminology
IndirectstaticearthingA way of grounding an object through a non-metallic conductor or antistatic materials and antistatic products. [SH3097-20002 Terminology]
ElectrostaticearthingresistanceofelectricityThe resistance to earth of an electrostatic grounding system. Direct electrostatic grounding resistance is the sum of the grounding resistance of the grounding body or natural grounding body and the grounding wire resistance. Indirect electrostatic grounding resistance is the total resistance between the grounding electrode of the grounded object and the earth, which is mainly determined by the resistance of conductive, antistatic materials or antistatic products.
[SH3097-20002 Terminology
Lightning protection system check and measure The whole process of inspection, measurement and information comprehensive processing of lightning protection devices in explosion and fire hazardous environments. 3.22
Antistatic grounding device inspection electrostatic earthing system check and measure The whole process of inspection, measurement and information comprehensive processing of antistatic grounding devices in explosion and fire hazardous environments. 4 General provisions
4.1 Lightning protection classification
Buildings in explosion and fire hazardous environments should be divided into three categories according to their importance, nature of use, possibility and consequences of lightning accidents, and lightning protection requirements.
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Explosion will cause great damage and personal injury. 一Buildings with explosion hazard areas in Zone 0 or Zone 10. 一Buildings with explosion hazard areas in Zone 1 or fire hazard areas in Zone 21, explosion caused by electric sparks will cause great damage and personal injury.
4.1.2 In any of the following situations, it should be classified as a second-class lightning protection building: 一Buildings for manufacturing, using or storing explosive substances, and electric sparks are not likely to cause explosions or cause great damage and personal injury.
一Buildings with explosion hazard areas in Zone 1 or fire hazard areas in Zone 21, and electric sparks are not likely to cause explosions or cause great damage and personal injury.
一Buildings with explosion hazard areas in Zone 2 or Zone 22. 一Open-air steel closed gas cylinders with explosion hazards. 4.1.3 Buildings in explosion and fire hazardous environments that do not belong to the first and second category lightning protection buildings can be classified as third category lightning protection buildings. The zoning of explosion and fire hazardous environments is shown in Appendix A. 4.2 Basic requirements and work procedures for testing
4.2.1 On-site testing should be undertaken by two or more testers. When conducting testing work, the testers must comply with the relevant safety regulations for working in explosion and fire hazardous environments. 4.2.2 The testing procedures for lightning protection devices and anti-static grounding devices should be carried out according to the procedures specified in Figure 1. Accept the test application
Environmental investigation
Develop the test plan
Confirm the status of instruments and equipment
On-site inspection and testing
Test data recording and collation
Calculation analysis and result judgment
Test report
Figure 1 Flow chart of the testing process of lightning protection devices and anti-static grounding devices 4.2.3 Investigation of the on-site lightning protection environment and relevant information, including the following contents: 4.2.3.1 According to Article 4.1 of this standard, confirm the first, second and third types of lightning protection. 4.2.3.2 Confirm the division of lightning protection areas. The division of lightning protection areas is shown in Appendix B. 4.2.3.3 Check the lightning protection design and construction data of the tested site, investigate the relevant personnel, and understand the measures for protection against direct lightning and lightning electromagnetic pulses; check the installation and laying methods of lightning arresters and down conductors; check the grounding form, equipotential connection and anti-static grounding conditions, etc. 4.2.3.4 Check the grounding form of low-voltage power distribution, the setting and installation process of surge protector (SPD), pipeline layout and shielding measures, etc. 4.2.3.5
Check that the actual operating conditions of lightning protection devices and anti-static grounding devices should be consistent with the original design requirements. QXT1102009
4.2.4 Before the test, the instruments and measuring tools used should comply with the use regulations of explosion and fire hazardous environments, and ensure that they are within the validity period of the measurement certificate and can be used normally. The accuracy of instruments and measuring tools should meet the requirements of the test items. 4.2.5 The test of the grounding resistance of the lightning protection device should be carried out under the conditions of no rainfall, no water accumulation and non-frozen soil. 4.2.6 The test data should be recorded in a special original record form. The test record should be filled in with a fountain pen or a signature pen, and the handwriting should be neat and clear. It is strictly forbidden to alter it; a straight line should be drawn on the original data to correct the error, and the correct data should be filled in the upper right corner. The original record must be signed by the tester and the reviewer. The original record form can be found in Appendix D. 4.2.7 The test data should be compared and calculated item by item, and the evaluation conclusion of the test items should be given according to the relevant technical standards, and the test report should be issued. 4.2.8 The testing unit shall file the test report together with the original records and keep them for more than two years. Testing cycle
A regular testing system shall be implemented for lightning protection devices and anti-static grounding devices in explosion and fire hazardous environments, and the tests shall be carried out every six months. 5.2 For lightning protection devices in important explosion and fire hazardous environments in areas with frequent lightning strikes, the number of tests shall be appropriately increased. Testing content and technical requirements
6.1 Lightning receptor
6.1.1 Check the material, specifications (including diameter, cross-sectional area, thickness), welding process with down conductor, anti-corrosion measures, protection range and safety distance between the lightning receptor and the protected object. The lightning receptor shall comply with the requirements of Appendix E of this standard. 6.1.2 Check the clear distance between trees near the first-class buildings and higher than the buildings and the buildings, which shall not be less than 5m. Check that the lightning receptor shall not have obvious mechanical damage, breakage and severe rust. 6.1.3
Check that various power lines and signal lines shall not be tied or hung on the lightning receptor. 6.1.4
Test the electrical connection between the lightning arrester and each down conductor. 6.1.5
Test the electrical connection between the roof electrical equipment and metal components and the lightning protection device. Test the electrical connection between the side lightning protection device and the grounding device. 6.1.7
6.2 Down conductor
6.2.1 Check the setting, material, specifications (including diameter, cross-sectional area, thickness), welding process, and anti-corrosion measures of the down conductor. The down conductor should meet the requirements of Appendix E
6.2.2 Check that the down conductor should not have obvious mechanical damage, breakage, or severe rust. 6.2.3 Check the distance between various signal lines, power lines, and down conductors. The horizontal clearance should not be less than 1m, and the cross clearance should not be less than 0.3m.
6.2.4 Check the distance between the down conductors. For distance requirements, see the requirements in Appendix E. 6.2.5 Test the grounding resistance of each down conductor. For down conductors equipped with disconnect cards, the disconnect cards should be disconnected at least once a year to test their grounding resistance. See Appendix F for the measurement method.
6.3 Grounding device
6.3.1 Check the design and construction data, and check the material, specifications and anti-corrosion measures of the grounding body. The specifications (diameter, cross-sectional area, thickness), burial depth, welding process, and connection with the down conductor of the grounding body shall comply with the requirements of Appendix E of this standard. 6.3.2 Check the distance between the artificial grounding body for lightning protection and the entrance and exit of the building or the sidewalk. The distance requirements are shown in the requirements of Appendix E.
6.3.3 Test the grounding resistance of the grounding device. See Appendix F for the measurement method. 6.4 Equipotential connection
6.4.1 Check the metal parts that pass through the boundaries of each lightning protection zone, as well as the equipment, metal pipes, cable trays, cable metal sheaths, metal frames, steel roof trusses, metal doors and windows and other large metal objects in the building. They should be connected to the grounding device or equipotential connection plate (strip) nearby, and test whether it is controlled by the gas connection
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6.4.3 Check the material, specification, connection method and process requirements of the equipotential connection line, which should meet the requirements of Appendix E of this standard. 6.4.4 Check the long metal objects such as pipes, frames and cable metal sheaths laid in parallel. When the net distance is less than 100mm, metal wires should be used for cross-connection, and the spacing between the cross-connection points should not be greater than 30m; when the cross-clear distance is less than 100mm, the cross-connection should also be cross-connected. When the transition resistance of the elbow valve, flange and other joints of long metal objects is greater than 0.03, the joints should be cross-connected with metal wires. 6.5 Electromagnetic shielding
6.5.1 Check the electrical connectivity of the shielding layer. The metal cable duct should be fully enclosed and grounded at both ends. Test its electrical connection. 6.5.2 Check the cables laid between buildings. Both ends of their shielding layers should be connected to the equipotential bonding belts of their respective buildings. Test their electrical connection.
6.5.3 When the system requires equipotential bonding at only one end, check that two layers of shielding should be used. The outer shielding should meet the requirements of 6.5.1. 6.5.4 Check the equipotential bonding of the exposed conductive parts of low-voltage electrical equipment used in explosion and fire hazardous environments, the PE line of the distribution line, and the outer layer of the signal line shielding, and test their electrical connection. 6.6 Surge protector SPD
6.6.1 Check that the installation location of the SPD is compatible with the requirements of the use environment. 6.6.2 Check the selection of the SPD. Check that the main technical parameters of the SPD (such as discharge current Iimp or I., maximum continuous operating voltage U., voltage protection level U.) should meet the design requirements. 6.6.3 Check that the material and cross-section of the connecting wires at both ends of the SPD should meet the design requirements; check the length of the connecting wires at both ends of the SPD. The requirements for the connecting wires at both ends of the SPD are shown in Appendix E. 6.6.4 When the SPD uses two or more levels (including two levels), check the line length between the SPDs. The requirements for the line length between SPDs are shown in Appendix E.
6.6.5 Test the electrical connection between the SPD grounding terminal and the grounding device. 6.7 Anti-static grounding device
The inspection of anti-static grounding devices in explosion and fire hazardous environments is divided into two categories according to the inspection content and Appendix G: production sites and storage and transportation sites. 6.7.1 Production site
6.7.1.1 Check the electrostatic grounding condition of the metal shells of process equipment (operating tables, conveyor belts, towers, containers, heat exchangers, filters, containers for solvents or powders, etc.) and equipment in the production site, and test their electrical connection with the grounding device. The electrostatic grounding connection wire should be bolted, and the material and specifications of the electrostatic grounding wire should meet the requirements of Appendix H. 6.7.1.2 Check the spacing between the electrostatic grounding points of devices with a diameter greater than or equal to 2.5m and a volume greater than or equal to 50m3. The spacing should not be greater than 30m, and there should be no less than two points, and test their electrical connection with the grounding device. 6.7.1.3 Check the electrostatic grounding condition of the vibrating parts of vibrating process equipment or equipment, and test their electrical connection with the grounding device. The material and specifications of the electrostatic grounding wire should meet the requirements of Appendix H. 6.7.1.4 Check the electrostatic grounding condition of the anti-static grounding brush and protective cover of the belt-driven unit and its belt, and test their electrical connection with the grounding device. The material and specifications of the electrostatic grounding wire should meet the requirements of Appendix H. 6.7.1.5 Check the electrostatic grounding condition of the grounding terminal of the metal wire woven into the bag body of the bag dust collector of combustible dust, and test its electrical connection with the grounding device. The material and specifications of the electrostatic grounding wire should comply with the requirements of Appendix H. 6.7.1.6 Check the electrostatic grounding condition of metal parts insulated from the ground (such as flanges, hose joints, nozzles, etc.), and require the use of copper core soft stranded wire for cross-connection and grounding. The material and specifications of the electrostatic grounding wire should comply with the requirements of Appendix H. 6.7.1.7 Check the equipotential connection and electrostatic grounding condition of metal conductor parts in other production sites such as powder screening, grinding, and mixing, and test their electrical connection and electrostatic grounding resistance. The conductor parts and the connecting wires should be bolted, and the material and specifications of the electrostatic grounding wire should comply with the requirements of Appendix H.
6.7.1.8 Check that a human body electrostatic grounding device should be installed at the entrance of the production site, and its grounding resistance should be tested. 6.7.2 Storage and transportation sites
Oil and gas storage tanks
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b) Check the electrical connection between the metal components (agitators, lifters, instrument pipelines, metal floats, etc.) in unused storage tanks and the tank body, and test their electrical connections. The material and specifications of the connecting wires should comply with the requirements of Appendix H. c) Check the electrical connection between the floating roof tank's floating boat, tank wall, movable ladder and other movable metal components and the tank wall, and test their electrical connections. The connecting wire should be connected with a copper core soft stranded wire with a cross-section of not less than 25mm2, and there should be no less than two connection points. d) Check the electrical connection and grounding of the metal components of the oil (gas) tank and tank room, as well as the metal accessories such as the breathing valve, oil measuring hole, vent pipe and safety valve, and test their electrical connections.
e) Check that a human body static grounding device should be installed at the entrance of the escalator, and test its grounding resistance. 6.7.2.2 Oil and gas pipeline system
a) Check that long-distance non-branched pipelines and pipelines entering and exiting process equipment areas (including production workshops, storage tanks, etc.) and bifurcations should be grounded as required, and their grounding resistance should be tested.
b) Check that pipelines within 100m of the building should be grounded every 25m and their grounding resistance should be tested. c) When the clear distance between parallel pipelines is less than 100mm, electrical connections should be made every 20m30m. When the pipelines cross and the clear distance is less than 100mm, electrical connections should be made and their electrical connections should be tested. d) Check that the flanges of the pipelines should be connected by jumpers. In a non-corrosive environment, no less than five bolts can be used without jumpers. Test the transition resistance of the flange jumper. For the material and specifications of the electrostatic connection line, refer to the requirements of Appendix H. e) Check that the heating companion pipe of the process pipeline should be electrically connected to the process pipeline at the companion pipe air inlet and return water outlet, and its electrical connection should be tested. For the material and specifications of the electrostatic connection line, refer to the requirements of Appendix H. f) Check the air duct and metal plate protective cover of the outer insulation layer of the storage tank. The joints should be bitten and electrically connected to the tank body and grounded with mechanically fixed bolts. Test its electrical connection with the grounding device. g) Check that the metal pipes at both ends of the non-conductor pipe in the middle of the metal piping should be connected to the grounding trunk line respectively, or use a copper core soft stranded wire with a cross-section of not less than 6mm to jumper and ground, and test the transition resistance at both ends of the jumper wire. h) Check that all metal parts on the non-conductor pipe section should be grounded, and test its electrical connection with the grounding device. 6.7.2.3 Oil and gas transportation railway and automobile loading and unloading area a) Check that the metal pipelines, equipment, street lights, line shielding pipes, structures, etc. in the oil and gas loading and unloading area should be electrically connected and grounded as required, and test its electrical connection with the grounding device. For the material and specifications of the grounding wire, please refer to the requirements in Appendix H. b) Check that both ends of the railway rails in the oil and gas loading and unloading area should be grounded, and the electrical path between the rails in the area and outside the area should be insulated and isolated. A jumper should be made between the parallel rails at each crane position, and test its electrical connection with the grounding device. For the material and specifications of the grounding wire, please refer to the requirements of Appendix H.
c) Check the entrance of the ladder on the operating platform. A human body static grounding device should be installed and its grounding resistance should be tested. d) Check the grounding terminal (clamp) directly connected to the grounding trunk line at each crane platform or station. It should be electrically connected to the crane pipe port and its electrical connection with the grounding device should be tested. e) Check that the loading and unloading sites such as tank trucks, tank trucks and storage tanks should be equipped with static grounding instruments that can detect the grounding status and test their static grounding resistance.
6.7.2.4 Oil and gas transportation terminal
a) Check that the terminal ship should be equipped with at least one static grounding device on land as required and test its static grounding resistance. b) Check that the metal pipes, equipment and structures of the terminal (including the terminal approach bridge, the metal components of the trestle, the foundation steel bars, etc.) should be electrically connected as required and connected to the static grounding device and their electrical connection and static grounding resistance should be tested. For the material and specifications of the grounding wire, please refer to the requirements of Appendix H.
c) Check that the loading and unloading platform or ship should be equipped with a static-conducting grounding device that is connected to the storage and transportation ship. For the material and specifications of the grounding wire, see Appendix H. Test its electrical connection.
d) Check that a human body static-conducting grounding device should be installed at the ship's entrance and test its static-conducting grounding resistance. 6725
Liquid filling station
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