Detail of GB 4351-2023

Introduction of GB 4351-2023

Portable fire extinguishers 1 Scope This document specifies the terms and definitions, classification and models of portable fire extinguishers (hereinafter referred to as fire extinguishers), and also specifies the performance requirements, colors and marks, manuals, inspection rules, packaging, transportation and storage of portable fire extinguishers and components, as well as their test methods. This document is applicable to the design, manufacture and inspection of portable fire extinguishers and their components used in industrial and civil buildings. 2 Normative references The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies. GB/T 192 General purpose metric screw threads - Basic profile GB/T 193 General purpose metric screw threads - General plan GB/T 196 General purpose metric screw threads - Basic dimensions GB/T 197 General purpose metric screw threads - Tolerances GB/T 1804 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications GB/T 2516 General purpose metric screw threads - Limit deviations GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection GB/T 3181 Colour standard for paint film GB 4066 Powder extinguishing agent GB 4396 Fire extinguishing agent - Carbon dioxide GB/T 4423 Copper and copper-alloy cold-drawn rod and bar GB/T 4968 Classification of fires GB/T 5099.1 Seamless steel gas cylinders - Part 1:Quenched and tempered steel cylinders with tensile strength less than 1100MPa GB/T 5231 Designation and chemical composition of wrought copper and copper alloys GB/T 5907.5 Fire protection vocabulary - Part 5: Fire products GB/T 8335 Special threads for gas cylinders GB/T 9251 Methods for hydrostatic test of gas cylinders GB/T 9252 Method for pressure cycling test of gas cylinders GB/T 11640 Seamless aluminum alloy gas cylinders GB/T 13005 Terminology of gas cylinders GB/T 15385 Method for hydraulic burst test of gas cylinder GB 17835 Water based extinguishing agent GB 25971 Fire extinguishing agent hexafluoropropane (HFC236fa) GB 26861 Safety code of electric power industry - Part of high voltage laboratory GB/T 33209 Welding procedure qualification for welded gas cylinders HG/T 2579 Rubber compounds of O-rings used for hydraulic fluid power system XF 578 Superfine powder extinguishing agent XF 634 Adiabatic protective clothing for firefighter XF 979 Fire extinguishing media - D powder 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 4968, GB/T 5907.5 and GB/T 13005 and the following apply. 3.1 portable fire extinguishers carbon dioxide fire extinguishers with a total mass of not greater than 23kg and other types of fire extinguishers with a total mass of not greater than 20kg Note: Portable fire extinguisher which can discharge extinguishing agent to extinguish fire under the action of its internal pressure. [Source: GB/T 5907.5-2015, 2.5.1.1, modified] 3.2 charge of extinguisher volume (L) of extinguishing agent filled in water-based fire extinguishers or mass (kg) of extinguishing agent filled in other types of fire extinguishers 3.3 effective discharge time duration from the time when the extinguishing agent is discharged from the nozzle of the fire extinguisher to the time when the gaseous point of the discharging flow appears, during which the fire extinguisher valve is fully open Note: Gaseous point refers to the transition point of the discharging flow of fire extinguisher from extinguishing agent to propellant. 3.4 complete discharge state when the internal pressure of fire extinguisher is equal to its external pressure with the fire extinguisher valve fully open 3.5 bulk range distance between the farthest point of the discharging flow and the nozzle of the fire extinguisher when discharging to 50% of its charge 3.6 delayed-action time of discharge duration from the time when the fire extinguisher valve is fully opened to the time when the extinguishing agent starts to be discharged from the nozzle 4 Classification and model 4.1 Classification 4.1.1 Portable fire extinguishers are classified as follows according to the extinguishing agents filled: a) powder fire extinguishers; b) water-based fire extinguishers (including pure water or water with additives such as wetting agent, thickening agent, flame retardant, foaming agent and wet chemical agent); c) carbon dioxide fire extinguishers; d) clean agent fire extinguishers.

Contents of GB 4351-2023

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Classification and model 4.1 Classification 4.2 Types 5 Performance requirements for fire extinguishers 5.1 Service temperature range 5.2 Filling requirements 5.3 Discharging performance 5.4 Mechanical properties 5.5 Sealing performance 5.6 Corrosion resistance 5.7 Fire extinguishing performance 5.8 Electrical insulation performance 6 Performance requirements for components of an extinguisher 6.1 Cylinder 6.2 Fire extinguisher valve components 6.3 Safety device 6.4 Pressure gauge 6.5 Discharging hose 6.6 Filter screen for water-based fire extinguisher 6.7 Rubber seals 6.8 Plastic parts 6.9 Fixing frames 6.10 Extinguishing agents 6.11 Propellant 7 Test methods of fire extinguishers 7.1 Filling inspection 7.2 Discharging performance test 7.3 Mechanical performance test 7.4 Sealing performance test 7.5 Corrosion resistance test 7.6 Fire extinguishing performance test 7.7 Electrical insulation performance test 8 Test methods of components of an extinguisher 8.1 Test of cylinder 8.2 Test of fire extinguisher valve components 8.3 Test of safety device 8.4 Test of pressure gauge 8.5 Test of discharging hose 8.6 Test of filter screen for water-based fire extinguisher 8.7 Test of rubber seals 8.8 Test of plastic parts 8.9 Test of fixing frames 8.10 Test of extinguishing agents 8.11 Test of propellant 9 Colors and marks 9.1 Colors 9.2 Marking 10 Instructions 10.1 Operating instructions 10.2 Maintenance instructions 11 Inspection rules 11.1 Inspection classification and items 11.2 Sampling 11.3 Judgment of inspection results 12 Packaging, transportation and storage 12.1 Packaging 12.2 Transportation 12.3 Storage Annex A (Normative) Characteristic parameters, steel impression mark information and cylinder valve component torque of seamless cylinders of carbon dioxide fire extinguishers Annex B (Normative) Low pressure cylinders of portable fire extinguishers Annex C (Normative) Valves of portable fire extinguishers Annex D (Normative) Pressure gauge Annex E (Informative) Vibration and impact test devices for powder fire extinguishers Annex F (Informative) Class D fire test methods