GB 50650-2011 English PDFUS$1199.00 · In stock
Delivery: <= 8 days. True-PDF full-copy in English will be manually translated and delivered via email. GB 50650-2011: Code for design protection of petrochemical plant against lightning Status: Valid
Basic dataStandard ID: GB 50650-2011 (GB50650-2011)Description (Translated English): Code for design protection of petrochemical plant against lightning Sector / Industry: National Standard Classification of Chinese Standard: P71 Classification of International Standard: 75.010 Word Count Estimation: 54,537 Date of Issue: 2010-12-24 Date of Implementation: 2011-12-01 Quoted Standard: GB 50057; GB 50074; GB/T 21714.3 Regulation (derived from): Ministry of Housing and Urban-Rural Development Bulletin No.882 Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Summary: This standard applies to new, mine design renovation and expansion of petrochemical plants and auxiliary production facilities, does not apply to the acquisition of crude oil, long-distance transport, mine design oil petrochemical plant offsite storage and sales facilities. GB 50650-2011: Code for design protection of petrochemical plant against lightning---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.1 General 1.0.1 This specification is formulated to prevent and reduce equipment damage and personal casualties caused by lightning strikes, and standardize the lightning protection design of petrochemical plants and their auxiliary facilities. 1.0.2 This specification is applicable to the lightning protection design of newly built, rebuilt and expanded petrochemical plants and their auxiliary production facilities; it is not applicable to the lightning protection of crude oil collection, long-distance transportation, oil storage and sales facilities outside the petrochemical plants design. 1.0.3 The lightning protection design of petrochemical installations shall not only comply with this specification, but also comply with the current relevant national standards. 2 terms 2.0.1 Petrochemical plant A production device that produces petrochemical products (or intermediates) using petroleum, natural gas and their products as raw materials. 2.0.2 Auxiliary production facilities support facilities The necessary facilities to cooperate with the main process equipment to complete its production process, including tank farms, central laboratories, sewage treatment plants, maintenance rooms, torches, etc. 2.0.3 Industrial building (warehouse) It is a production (storage) building with a roof, and the building envelope is all constructed of closed walls (including doors and windows). 2.0.4 outdoor unit In the open air or in a place open to the atmosphere and with good ventilation. 2.0.5 Semi-enclosed industrial buildings There is a roof, and the building enclosure structure partially adopts walls, and the occupied area does not exceed 1/3 of the surface area of the building enclosure (excluding the area of the roof and the ground). 2.0.6 Opened industrial buildings A productive building with a roof and no building envelope. 2.0.7 lightning stroke An electrical discharge in a lightning strike to ground. 2.0.8 direct lightning flash Lightning strikes directly on buildings, other objects, the ground or external lightning protection devices, producing electrical effects, thermal effects and mechanical forces. 2.0.9 lightning induction Lightning electrostatic induction and lightning electromagnetic induction that may cause spark discharges between metal parts on nearby conductors during lightning discharge. 2.0.10 Lightning surge on incoming services Due to the action of lightning on overhead lines, cable lines or metal pipes, lightning waves, i.e. lightning surges, may invade the house along these lines, endangering personal safety or damaging equipment. 2.0.11 lightning protection system (LPS) A complete system for reducing material damage caused by lightning strikes on production installations, consisting of external lightning protection and internal lightning protection. 2.0.12 external lightning protection system external lightning protection system An integral part of the lightning protection device, it is composed of lightning receptors, down conductors and grounding devices. 2.0.13 internal lightning protection system An integral part of the lightning protection device consisting of equipotential bonding and electrical insulation from the external lightning protection device. 2.0.14 air-termination system The components of the external lightning protection device are composed of lightning rods (lightning rods), lightning wires, lightning nets and other metal components. 2.0.15 down-conductor system Part of the external lightning protection system used to conduct the lightning current from the air terminal to the grounding device. 2.0.16 Earth-termination system The part of the external lightning protection device that conducts the lightning current and disperses it into the earth. 2.0.17 Earthing electrode Buried in the soil or in the concrete foundation as a conductor for diffusion. 2.0.18 Earthing conductor The connection conductor from the down-conductor disconnection card or line change point to the grounding body; or the connection conductor from the grounding terminal, equipotential bonding row to the grounding body or grounding device. 2.0.19 Equipotential bonding network bonding network A system for interconnecting all conductive objects (except live conductors) to earthing. 2.0.20 Earthing system earthing system The complete system that combines the grounding device and the equipotential bonding network. 2.0.21 ground resistance ground resistance The sum of the resistance to ground and the resistance of the grounding wire of the grounding body or natural grounding body. 2.0.22 power frequency ground resistance power frequency ground resistance The resistance obtained according to the power-frequency alternating current flowing into the ground through the grounding body. 2.0.23 Impulse earth resistance The grounding resistance obtained according to the inrush current flowing into the ground through the grounding body. 3 Classification of lightning protection sites3.0.1 The various locations of petrochemical installations shall be classified as factory buildings or outdoor installation areas according to the environmental conditions that can form explosive gas mixtures and the dissipation conditions of space gases. 3.0.2 Semi-open and open factory buildings should be divided into factory buildings or outdoor installation areas according to their openness. Large compressor workshops with roofs and open walls should be classified as factory buildings; frames with sparsely arranged equipment and pipelines should be classified as outdoor installation areas.4 Basic Regulations4.1 Factories and buildings 4.1.1 The lightning protection design of petrochemical plants and buildings should comply with the relevant provisions of the current national standard "Code for Lightning Protection Design of Buildings" GB 50057. 4.1.2 The lightning protection design for outdoor installation areas of petrochemical installations shall comply with the relevant provisions of Chapter V of this code. 4.2 Outdoor installation area 4.2.1 In the outdoor installation area of petrochemical installations, lightning protection design should be carried out in case of any of the following situations. 1 Tall and towering production equipment placed on the ground; 2 The production equipment and the main pipeline leading to the torch, etc., which are placed at high places through frames or brackets; 3 Rotating equipment such as large compressors and pumps arranged in groups on the ground; 4 Flares, chimneys and exhaust stacks in open areas; 5 Install lighting facilities that are vulnerable to direct lightning strikes at high places. 4.2.2 The outdoor installation area of petrochemical installations may not be designed to prevent direct lightning strikes in case of one of the following situations. 1 Water treatment sites scattered in open areas (except for important equipment); 2 A small number of pumps and small metal equipment scattered on the ground; 3 Ground pipes and pipe racks. 4.2.3 The air-termination device for direct lightning protection should use the metal entity of the production equipment, but it should meet the following requirements. 1 The production equipment used as lightning receptors should be metal static equipment with integrally closed and welded structure; rotating equipment should not be used as lightning receptors; 2 The production equipment used as lightning receptors should have a metal casing, and its top and outer upper parts that are susceptible to direct lightning strikes should have sufficient thickness. The wall thickness of steel equipment shall be greater than or equal to 4mm, and the wall thickness of other metal equipment shall comply with the thickness t value in Table 6.1.5 of this code. 4.2.4 For the following equipment that is susceptible to direct lightning strikes and is outside the lightning protection range of nearby tall production equipment, frames and large pipe racks (used as lightning receptors), lightning receptors should be installed separately. 1 rotating equipment; 2 It cannot be used as a metal static device of the lightning receptor; 3 Static devices with non-metallic enclosures. 4.2.5 The lightning protection range of the air receptor shall be determined by one of the following methods. 1 It should comply with the provisions of the current national standard "Code for Lightning Protection Design of Buildings" GB 50057 rolling ball method, and the radius of the rolling ball is 45m; 2 The height difference and protection angle between the top of the lightning terminal and the protected reference plane shall comply with the provisions in Table 4.2.5 or the current national standard "Lightning Protection Part 3.Physical Damage to Buildings and Danger to Life" GB/T 21714.3 Regulation. 4.2.6 The down conductors for direct lightning protection shall meet the following requirements. 1 The tall and towering production equipment placed on the ground should use its metal shell as a down conductor; 2 When the production equipment is installed through the frame or bracket, it is advisable to use the metal frame as the down conductor; 3 At least two down-conductors should be used for tall furnaces, towers, tanks, large-scale equipment, frames, etc., and the distance between the down-conductors should not be greater than 18m; 4 Arranged at high altitude, longer horizontal containers and pipes (pipes sent to the torch) should be provided with down-conductors at both ends, and the number of down-conductors should be increased when the distance exceeds 18m; 5.The down-conductor should be led directly to the grounding body in the straightest and shortest possible way, with sufficient cross-section and thickness, and mechanical protection above the ground; 6 When the longitudinal main reinforcement in the column is used as the down conductor, the longitudinal main reinforcement in the column shall be bound or welded with stirrups. 4.2.7 Lightning protection induction measures shall meet the following requirements. 1 In the outdoor installation area, all metal equipment, frames, pipes, cable protection layers (armour, steel pipe, slot plate, etc.) For special down-conductors, the steel bars of the reinforced concrete columns should also be connected to the grounding wire (network) respectively at the top of the highest floor and near the ground; 2 The space distance between the metal object mentioned in item 1 of this article and the nearby down conductor shall be determined according to the following formula. S≥0.075kclx (4.2.7) In the formula. S——space distance (m); kc - shunt coefficient; take 1 for a single down-conductor, 0.66 for two down-conductors and multiple down-conductors that do not form a closed loop, and 0.44 for multiple down-conductors that form a closed loop or mesh; lx——the length (m) from the calculation point of the downconductor to the ground connection point. 3 When the space distance required by paragraph 2 of this article cannot be met, the ground connection line shall be added at a place higher than the connection point; 4 For metal pipes, frames and cable metal protection layers laid in parallel, metal connections shall be made every 30m when the clear distance between them is less than 100mm, and connections shall also be made when the clear distance between intersections or distances is less than 100mm. 4.2.8 The lightning protection grounding device shall meet the following requirements. 1 For the production equipment using the metal casing as the lightning receptor, it should be connected to the grounding body at no less than 2 places at the bottom of the metal casing; 2 Article 4.2.4 of this code stipulates that the air-termination devices (rod-shaped, wire-shaped and mesh-shaped) installed separately shall have down-conductors directly connected to the grounding body; 3 The grounding body directly connected to each down-conductor used for direct lightning protection shall have an impact grounding resistance not greater than 10Ω, and shall meet the following requirements. 1) In the calculation of grounding resistance, the length of each branch line of each grounding body should be less than or equal to the effective length le of the grounding body; 2) The calculation of le and the conversion of the impact grounding resistance should be carried out in accordance with the relevant provisions of the current national standard "Code for Lightning Protection Design of Buildings" GB 50057; 4 The power frequency grounding resistance of the grounding body for lightning protection should not be greater than 30Ω; 5 The grounding body for direct lightning protection should be connected with the grounding body for lightning protection induction and electrical equipment to form an integral grounding system. However, the grounding resistance of the grounding body for direct lightning protection shall meet the requirements of paragraph 3 of this article. 4.3 Discharge facilities in outdoor installation areas 4.3.1 The discharge facilities installed on the top and outer upper part of the production equipment that are susceptible to direct lightning strikes and directly discharge to the atmosphere (such as release pipes, exhaust pipes, safety valves, breathing valves, discharge ports, sampling ports, sewage outlets, etc., Hereinafter referred to as the vent), lightning protection should be carried out according to the nature of production operations such as discharged materials and concentrations, discharge frequency or methods, normal or accidental discharges, manual or automatic discharges, and installation locations. 4.3.2 The air vents that fall under one of the following conditions shall be protected by an air-termination device. At this time, the explosive hazardous gas space outside the vent should be within the protection range of the air-termination, and the top of the air-termination should be 3m higher than the vent, and the horizontal distance should be 4m to 5m. 1 Equipment for storing flammable liquids with a flash point lower than or equal to 45°C, which is discharged continuously during production emergency shutdown, and whose discharge reaches an explosive concentration (including the temporary vent on the pipeline of the flare system, but excluding the flare) ; 2 Storage tanks for storing flammable liquids with a flash point lower than or equal to 45°C, and the breathing valve does not have an explosion-proof flame arrester. 4.3.3 For vents that fall into one of the following situations, metal vent nozzles should be used as lightning receptors. At this time, the wall thickness of the vent pipe opening should be greater than or equal to the thickness t' value in Table 6.1.5, and the vent pipe should be metal-connected to the nearest metal object near the vent pipe opening. 1 For equipment that stores flammable liquids with a flash point lower than or equal to 45°C, the discharge that is continuously discharged during normal production may reach explosive concentration in a short period of time or intermittently; 2.Equipment for storing flammable liquids with a flash point lower than or equal to 45°C, and safety valves, etc., which may cause the internal overpressure of the equipment to be automatically or manually discharged for a short period of time due to overpressure during production fluctuations, etc.; 3 Equipment for storing flammable liquids with a flash point lower than or equal to 45°C, manual discharge ports for short-term discharge during shutdown or maintenance, etc.; 4 Breathing valves equipped with explosion-proof flame arresters on storage tanks for flammable liquids with a flash point lower than or equal to 45°C; 5 Exhaust towers and flares installed in isolation in open locations. 4.4 Other measures 4.4.1 When the factory buildings and outdoor installation areas are mixed, the lightning protection design should be carried out according to the following principles. 1 When the upper part is the frame and the lower part is the plant layout, it shall meet the relevant requirements of the outdoor installation area; 2 When the upper part is a factory building and the lower part is a frame layout, it shall meet the relevant requirements for factory buildings; 3 When the factory buildings and frames are arranged adjacent to each other, they shall meet their respective requirements. 5.7 Powder and granule bins 5.7.1 Installed independently or in groups on the concrete frame, the top of the metal powder and granular material tanks that are higher than the frame, when the wall thickness meets the requirements of the thickness t value in Table 6.1.5 of this code, powder should be used. 1.The main body of the granular material tank is used as a lightning receptor and should be well grounded. 5.7.2 Installed independently or in groups on the concrete frame, the non-metallic powder and granular material tanks whose tops are higher than the frame should be equipped with lightning receptors to make the powder and granular material tanks and the protruding tank roofs breathe Valves, etc. are within the protection range of the lightning receptor and should be grounded. The grid size of the lightning conductor should not be larger than 10m×10m or 12m×8m. 5.7.3 There should be no less than 2 grounding points for each metal tank, and they should be evenly arranged along the periphery of the powder and granular material tank, and the distance between the down conductors should not be greater than 18m. 5.8 Frames, pipe supports and piping 5.8.1 The steel frame and pipe frame should be connected to the grounding device through the column, and the connection should use the grounding connector. The connector should be welded on the column at a place not lower than 450mm above the ground, and the distance between the grounding points should not be greater than 18m. There should be no less than 2 grounding points for each frame and pipe frame. 5.8.2 Steel components such as ladders, cable brackets and railings on concrete frames and pipe racks shall be directly connected to the grounding device or connected through other grounding connectors, and the grounding distance shall not be greater than 18m. 5.8.3 The lightning protection design of pipelines shall meet the following requirements. 1 Each metal pipe shall be equipotentially connected to the grounded pipe rack, and the connection shall be made of grounding connectors; after multiple metal pipes can be connected to each other, they shall be equipotentially connected to the grounded pipe rack; 2 For metal pipes laid in parallel, if the net spacing is less than 100mm, they shall be connected with metal wires every 30m. When the net distance of pipeline intersections is less than 100mm, the intersections should be bridged by metal wires; 3 Metal pipelines conveying flammable medium are laid on pipe racks, and lightning protection induction grounding devices shall be installed at the beginning, end and branch, and the power frequency grounding resistance shall not be greater than 30Ω; 4 The metal pipes entering and exiting the production device shall be grounded on the outside of the device, and shall be connected with the protective grounding device of electrical equipment and the grounding device of lightning protection induction. 5.9 Cooling tower 5.9.1 For different types of cooling towers, the lightning protection design shall meet the following requirements. 1 Naturally ventilated open cooling towers and mechanical bla......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB 50650-2011_English be delivered?Answer: Upon your order, we will start to translate GB 50650-2011_English as soon as possible, and keep you informed of the progress. 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