Lightning protection design for chemical outdoor equipment
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This post was last edited by zhaohh3211 at 2010-10-19 17:20 About --- Lightning protection design of chemical outdoor devices ---- Anyone with experience recently discovered a problem. It turns out that the general provisions of GB50057-94 (2000) clearly indicate that the lightning protection design of chemical outdoor devices is not included. . Looking back on so many years of chemical and electrical design, I can’t help but feel ashamed. So what standards should we follow for the lightning protection design of chemical outdoor equipment? . . . . I hope the veterans and heroes in the compound can help!
GB50160-2008 GB50160-2008_Design Fire Protection Code for Petrochemical Enterprises 9.2 Lightning Protection 9.2.1 The lightning protection classification and lightning protection measures for buildings and structures in process equipment should be implemented in accordance with the relevant provisions of the "Lightning Protection Design Code for Buildings" (GB50057). 9.2.2 For towers, containers, etc. arranged in the open air in process equipment, when the thickness of the roof is equal to or greater than 4 mm, lightning rods and wire protection may not be provided, but lightning protection and grounding must be provided. 9.2.3 Steel tanks for flammable gases, liquefied hydrocarbons, and flammable liquids must be equipped with lightning protection and grounding, and shall comply with the following regulations: 1. For above-ground fixed roof tanks of Category A, B and B flammable liquids, when the thickness of the roof is less than 4mm, lightning rods and wires should be installed, and the protection scope should include the entire tank. ； 2. Class C liquid storage tanks do not need to be equipped with lightning rods and wires, but they should be equipped with induction lightning grounding ； 3. The floating roof tank and the inner floating roof tank do not need to be equipped with lightning rods and wires, but the floating roof and the tank should be electrically connected with two soft copper wires with a cross-section of not less than 25mm2 ； 4. The pressure storage tank is not equipped with lightning rods or wires, but it should be grounded. 9.2.4 The temperature, liquid level and other measuring devices of flammable liquid storage tanks should use armored cables or steel pipe wiring, and the cable sheath or wiring steel pipe should be electrically connected to the tank body. 9.2.5 The resistance requirements of the lightning protection grounding device should be implemented in accordance with the relevant provisions of the "Design Code for Petroleum Depots" (GB50074) and "Code for Design of Lightning Protection of Buildings" (GB50057).
The lightning protection design and lightning protection classification of chemical outdoor equipment cannot be designed and classified according to GB50057-94 "Lightning Protection Design Code for Buildings" (2000 Edition) (GB50057-94 "Lightning Protection Design Code for Buildings" (2000 Edition) clearly stipulates that this code does not apply to the lightning protection design of chemical outdoor equipment). Some design units still quote this specification as the design basis in the design instructions for chemical outdoor equipment, which obviously does not meet the design requirements. The lightning protection design and lightning protection classification of outdoor chemical equipment should mainly be carried out in accordance with GB50058-92 "Code for Design of Electrical Equipment in Explosive and Fire Hazardous Environments" and GB50160-92 "Code for Design of Fire Protection for Petrochemical Enterprises" (1999 Edition) and HG/T20675-1990 "Code for Design of Electrostatic Grounding for Chemical Enterprises". First, it is necessary to divide areas according to the explosive gas environment and the frequency and duration of the occurrence of explosive mixtures. ； Second, it should be based on the amount of leakage of flammable substances. ； The released explosive gas, mixture concentration, boiling point of flammable liquid, lower explosion limit, flash point, ventilation volume, etc. are used to determine the scope of the explosion hazard area. ； The third is to classify the hazardous media and hazard levels of dust explosions as well as their nature according to the explosive dust environment. Mainly based on the fire hazard environment, fire hazard areas should be correctly divided, and GB50160-90 "Petrochemical Enterprise Design Fire Protection Code" (1999 Edition) and HG/T 20675-1990 "Chemical Enterprise Electrostatic Grounding Design Code" should be strictly grasped and used to carry out lightning protection, fire protection and anti-static design.
Chemical plants are nothing more than metal equipment, including towers and tanks. We can just use the rolling ball method to design the lightning rod. According to the standard set, there is no problem. If you look for standard faults, you will definitely not find them, because * * What is formulated will definitely eliminate all responsibilities.
I also encountered the same problem. The chemical industry unit had just come into contact with the "Lightning Protection Design Code for Buildings".
GB 50160-2008_Design fire protection specifications for petrochemical enterprises 9.2 Lightning protection 9.2.3 Steel tanks for flammable gases, liquefied hydrocarbons, and flammable liquids must be equipped with lightning protection and grounding, and should comply with the following regulations: 3. The floating roof tank and the inner floating roof tank do not need to be equipped with lightning rods and wires, but the floating roof and the tank should be electrically connected with two soft copper wires with a cross-section of not less than 25mm2 ； "Lightning Safety Code for Petroleum and Petroleum Facilities" GB 15599-2009 4.1.3. Clearly stipulates: The floating roof is electrically connected to the tank body using two soft copper wires with a cross-section of not less than 50mm2... The floating roof of the currently designed and installed floating roof metal tank should be based on a cross-sectional area of 50mm2.
This post was last edited by soling on 2010-9-14 16:51. I suddenly discovered this problem today and learned* Got it! ! ! I hope experienced seniors can give me more advice. Now the "Design Code for Lightning Protection of Petrochemical Equipment" has been published, which has clear specifications for the lightning protection of petrochemical equipment.
The "Lightning Protection Design Code for Petrochemical Equipment" GB50650 is very clear. For outdoor installation areas, factory buildings must use 50057. Take a closer look.
Look at gb——50650!
When chemical and petroleum standards meet building lightning protection standards, designing according to building standards is equivalent to the constitution in law, which is fundamental!