GB 50193-1993Code of design for carbon dioxide fire extinguishing systems (English PDF)

2 Because the products and accessories made by different manufacturers are diverse from each

other 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 between storage 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 transfer lined, 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.

Contents

General 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 Symbol