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GB 50193-1993: [GB 50193-2010 Edition] Code of design for carbon dioxide fire extinguishing systems Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Obsolete
GB 50193-1993: [GB 50193-2010 Edition] Code of design for carbon dioxide fire extinguishing systems---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB50193-1993 NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA GB 50193-93 Code of Desig·n for Carbon Dioxide Fire Extinguishing System (2010 Edition) Issued on: DECEMBER 21, 1993 Implemented on: AUGUST 1, 1994 Jointly Issued by Ministry of Housing and Urban-Rural Construction of the People's Republic of China General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Explanation of Revision In this partial revision, the standard is revised on the base of "Code of Design for Carbon Dioxide Fire Extinguishing System" GB 50193-93 (1999 Edition) by the Tianjin Fire Research Institute of Ministry of Public Security jointly with the related organizations in accordance with the requirements of the document "Notice on printing and distributing (Formulation and Revision planning (Batch 1) of Engineering Construction Standards in 2008)" (Jian Biao [2008] No. 102), issued by the Ministry of Housing and Urban-Rural Development. Form the implementation, the current "Code of Design for Carbon Dioxide Fire Extinguishing System" pays an important roles in regulating the design of carbon dioxide extinguishing system and guiding the application and development of carbon dioxide extinguishing systems in China. However, with the deepgoing application and research of carbon dioxide extinguishing system and the progressive development of the products, the standard has not been applicable to the application actuality and developing trend of carbon dioxide extinguishing system, and it is necessary to be revised partially. Since the implementation of the current "Code of Design for Carbon Dioxide Fire Extinguishing System" on March 1, 2000, carbon dioxide extinguishing system has been applied under a sound developing condition in domestic engineerings. During the application process, there are several accidents of carbon dioxide extinguishing system misuse and leak, which results in the atrophic technical application of carbon dioxide extinguishing system in the last few years, especially, in civilian construction engineerings. Currently, the main application are centred on the industrial construction projects in coating line, cement production line, iron and steel industry, power plant, etc., In this revision, the problems in actual technical applications of carbon dioxide extinguishing systems are summed up in the following aspects. Due to the occurrence of carbon dioxide misuse and leak, causing injure to people, it is necessary to regulate the safety measures and related requirements for restriction, related to carbon dioxide extinguishing system, in the working space where staffs often work or stay; 2 Because the products and accessories made by different manufacturers are diverse from eachother in hydraulic equivalent loss length, the equivalent lengths of pipe accessories, determined according to the requirements of Appendix B in This code will be greatly different from the ones in practical situation;3 The standard has not specified that mechanical air exhaust devices shall be arranged betweenstorage containers, so leaks may be serious threat to the lives of staff in the rooms and rooms nearby;4 The specific requirements are proposed in the shunt design of carbon dioxide gas transferlined, for improving the pressure equalization of the pipe network. The articles underline in This code are ones revised. Chief drafting organization. Tianjin Fire Research Institute of Ministry of Public Security Participating organization. National Engineering research Center for fire Protection China National Center for Quality Supervision and Test of Fixed Fire- fighting Systems and Fire-resisting Building Components Nanjing Fire Protection Technology Co., Ltd.Table of ContentsGeneral Provision ... 1 2 Term and Symbol ... 2 2.1 Term ... 2 2.2 Symbol ... 3 3 System Design ... 6 3 .1 General Requirement ... 6 3.2 Total Flooding Extinguishing System ... 7 3 .3 Total Flooding Extinguishing System ... 8 4 Pipe Network Calculations ... 11 5 System Component ... 14 5. I Storage System ... 14 5 .2 Selector Valve and Nozzle ... 15 5.3 Pipe and Accessory ... 15 6 Control and Operation ... 17 7 Safety Requirements ... 18 Appendix A Material Factor, Design Concentration and Inhibition Time ... 19 Appendix B Equivalent Length of Pipe Accessories ... 21 Appendix C Pipe Pressure Sink ... 22 Appendix D YValue and Z Value of Carbon Dioxide ... 23 Appendix E Elevation Correction Factor ... 24 Appendix F Nozzle Inlet Pressure and Unit Area Injection Rate ... 25 Appendix G Explanation of Wording in This Code ... 26 Appendix H Nozzle Equivalent Orifice Dimension ... 27 Appendix J Specifications of Carbon Dioxide Fire Extinguishing System Pipes ... 28 1 General Provision 1.0.1 This code is formulated with a view to reasonably designing carbon dioxide extinguishing system, reducing fire hazards, and protecting and the safety of people and property. 1.0.2 This code is applicable to the designs of carbon dioxide extinguishing systems arranged in new, rebuild and extended engineering and storage systems. 1.0.3 The design of carbon dioxide extinguishing system shall actively adopt new technique, process and equipment, and be of safety and application, state-of-the-art, and economic feasibility. 1.0.4 Carbon dioxide extinguishing systems may be used for extinguishing the following fires. 1.0.4.1 Gas fire, which the gad source can be Cutting off before fire extinction. 1.0.4.2 Liquid fire or meltable solid (like paraffin and asphalt) fire. 1.0.4.3 Solid surface fire and solid deep-seated fire (like cotton wool, fabric and paper). 1.0.4.4 Electric fire . 1.0.5 Carbon dioxide extinguishing systems must not be used for extinguishing the following fires. 1.0.5.1 Fires of chemicals (like nitrocellulose and blasting powder) containing oxidants. 1.0.5.2 Fires of active metals like kalium, sodium, magnesium, titanium and zirconium. 1.0.5.3 Fires of metal hydrides like potassium hydride and sodium hydride. 1.0.SA Total flooding carbon dioxide extinguishing system shall not be applied at the places where staffs stay often. 1.0.6 The design of carbon dioxide extinguishing system, besides the requirements of this code, shall also meet the requirements of the current related national standards.2 Term and Symbol2.1 Term 2.1.1 Total flooding extinguishing system Fire extinguishing system which can eject carbon dioxide of finite concentration into a protected area within a specified time, and fully fill the whole protected area with carbon dioxide. 2.1.2 Local application extinguishing system Fire extinguishing system which directly ejects carbon dioxide onto protected object at the design ejection rate; and lasts for a certain time. 2.1.3 Protected area Close space meeting the application conditions of a total flooding carbon dioxide extinguishing system; and protected by the system. 2.1.4 Combined distribution systems Fire extinguishing system in which a suit of carbon dioxide storage device is used to protect two or more protected areas/protected objects. 2.1.5 Flame extinguishing concentration Minimum volume percentage (in a mixture of air and carbon dioxide) of carbon dioxide required to extinguish a certain fire, under the atmosphere 101 kPa and at the specified temperature. 2.1.6 Inhibition time Time to keep the designed carbon dioxide concentration and extinguish solid deep-seated fire fully. 2.1.7 Pressure relief opening An opening arranged on the exterior wall or top of a protected area to discharge internal super pressure of the protected area. 2.1.8 Equivalent orifice area Converted orifice area of a standard nozzle with the water flow rate coefficient of 0.98. 2.1.9 Filling factor Ratio of the mass of carbon dioxide stored in high pressure system container and the container volume. 2.1.9A Loading factor Ratio of the mass of liquid carbon dioxide stored in low-pressure system container and the container volume. 2.1.10 Material factor Reduction coefficient of the design carbon dioxide concentration of combustible substance corresponding to 34% carbon dioxide concentration. Vv--Volume of a protected area; < p--Nozzle setting angle. 2.2.2 Symbol of physical parameters Cp--Specific heat of pipe metal material; H-Carbon dioxide vaporization heat; K1--Area factor; K2--Volume factor; Kb--Material factor; Kd--Pipe diameter coefficient; Kh--High pressure correction factor; Km--Margin factor; M--Designed dosage of carbon dioxide; Mc--Storage volume of carbon dioxide; Mg--Mass of a pipe; M,--Residual amount of carbon dioxide in a pipe; Ms--Residual amount of carbon dioxide in a container; Mv--Evaporation amount of carbon dioxide in a pipe; Pi--Average pressure of the ;th pipe; Pi--Pressure of a node; P1--Permissible pressure intensity of fender structure; Q--Design flow of a pipe; Qi--Design flow of a single nozzle; Q1--Carbon-dioxide ejection rate; q0--Unit-area ejection rate of unit equivalent orifice; qv--Ejection rate of unit volume; T1--Mean temperature of a pipe before carbon d... ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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