GB 4351-2023Portable fire extinguishers (English PDF)

4.1 Classification

4.1.1 Portable fire extinguishers are classified according to the extinguishing agent they are filled with.

a) Dry powder fire extinguisher;

b) Water-based fire extinguisher (including pure water or water with additives, such as wetting agent, thickener, flame retardant, foaming agent, wet chemical agent, etc.);

c) Carbon dioxide fire extinguisher;

d) Clean agent fire extinguisher.

4.1.2 Portable fire extinguishers are classified according to the storage pressure of the propellant.

a) Pressure-type fire extinguisher;

b) Gas cylinder-type fire extinguisher.

4.2 Model The model compilation method of portable fire extinguishers is as follows: Enterprise-defined code (indicated by "I, II...", etc.) Equipped with a fixing bracket (omit if not equippedwith a fixing bracket) Suitable for car use (omitted for non-car use) Gas cylinder type (omitted for pressure storage type andcarbon dioxide fire extinguisher) Filling volume, in kilograms or liters (kg or L) Applicable fire category code ("A" for Class A, "B" for Class B, "AR" for water-based fire extinguishers with solvent resistance, "C" for Class C, "D" for Class D, "E" for Class E, and "F" for Class F)

5.2 Filling requirements

5.2.1 Filling volume The filling volume of the fire extinguisher shall be selected within the following range.

5.2.2 Fill error The fill error of the fire extinguisher shall comply with the requirements of Table 1.

5.2.3 Fill density The fill density of carbon dioxide fire extinguishers shall not exceed

0.75 kg/L and shall comply with the requirements of Table A.1 in Annex A. The fill density of clean gas fire extinguishers shall comply with the safety requirements of the cylinder.

5.3.2 Discharge performance in operating temperature range

5.3.3 Intermittent discharge performance The discharging of fire extinguishers shall be interrupted at any time. The delayed- action time of discharge of the first discharging of fire extinguishers shall not be greater than 5 s. The delayed-action time of discharge of subsequent intermittent discharging shall not be greater than 1 s. The rate of residual extinguishing medium of fire extinguishers shall not be greater than 10%.

5.3.4 Post-vibration discharge performance of dry powder fire extinguisher After the dry powder fire extinguisher has been subjected to the vibration test, it shall be able to operate normally. The delayed-action time of discharge shall not be greater than 5 s. The rate of residual extinguishing medium shall not be greater than 10%.

5.4 Mechanical properties

5.4.1 Impact resistance After the impact resistance test, the fire extinguisher shall not explode, rupture or have parts ejected.

5.4.2 Vibration resistance After the vibration resistance test, the fire extinguisher and its components shall not fall off, crack or deform significantly. The effective discharge time, delayed-action time of discharge, rate of residual extinguishing medium and bulk range of the fire extinguisher shall meet the requirements of 5.3.1.

5.5.1 Storage sealing performance

5.5.2 Intermittent injection sealing performance The pressure (or mass of extinguishing agent) measured for the second time after the fire extinguisher discharging is interrupted shall not be less than 75% of the pressure value (or mass of extinguishing agent) measured for the first time.

5.6 Corrosion resistance

5.6.1 External corrosion After the external corrosion test, it shall meet the following requirements.

6.2 Fire extinguisher valve assembly

6.3 Safety device The opening mechanism of the fire extinguisher shall be equipped with a safety device to prevent accidental operation and a fire extinguisher activation seal. The release action of the safety device shall be distinguished from the opening action of the opening mechanism and can indicate the activation status of the fire extinguisher. The activation seal shall not be made of lead-containing materials. The release force of the safety device shall not be less than 20 N and shall not be greater than 100 N.

6.4 Pressure gauge The pressure gauge shall comply with the provisions of Annex D. The pressure gauge shall be capable of being removed normally from the valve.

6.5 Discharge hose

6.5.1 General requirements The discharge hose and its connector assembly shall be able to function normally within the operating temperature range of the fire extinguisher. The design and installation of the connector shall ensure that the discharge hose will not be damaged. The discharge hose shall be marked with the service pressure value of the hose and the name or code of the manufacturer.

6.5.4 Low temperature bending performance

6.5.4.1 After the low temperature bending performance test, the lining and outer surface of the discharge hose shall not be broken.

6.5.4.2 After the water pressure test, the discharge hose shall not leak.

7.1 Fill inspection

7.1.1 Fill error The fill error test of the fire extinguisher shall be carried out in accordance with the method of 7.2.1.1.

7.1.2 Fill density The fill density test of carbon dioxide fire extinguishers shall be carried out in accordance with the method in 7.2.1.1.

7.3 Mechanical properties test

7.3.1 Impact resistance test The test shall be carried out according to the following steps.

8.1 Cylinder test

8.1.1 The cylinder and gas storage cylinder of carbon dioxide fire extinguisher shall be tested in accordance with GB/T 5099.1 or GB/T 11640.

8.1.2 Fire extinguisher cylinders with a service pressure not exceeding

2.5 MPa shall be tested in accordance with Annex B and relevant standards.

8.2 Test of fire extinguisher valve assembly test

8.2.1 The distance between the handle of the fire extinguisher and the upper end of the cylinder body shall be checked using a measuring tool with a graduation value of 1 mm.

8.2.2 Measure the opening force of the fire extinguisher taken out from storage temperature cycle 1 according to 7.2.2.Before the discharge test, connect the force gauge to the opening mechanism of the fire extinguisher. Open the fire extinguisher and measure the opening force.

8.2.3 Other test methods for valve components shall comply with the requirements of Annex C.

8.3 Safety device test Connect the force gauge to the safety device of the fire extinguisher. Release the safety. Measure the safety release force.

8.4 Pressure gauge test The test method for pressure gauge shall be in accordance with the requirements of Annex D.

8.5.1 Pressure resistance test

8.5.2 Low temperature bending performance test The test shall be carried out under the following conditions and steps.

8.5.3 Test of the horn of a carbon dioxide fire extinguisher The test shall be carried out according to the following steps.

8.6 Filter test for water-based fire extinguishers Check the installation and location of the filter of the water-based fire extinguisher. Measure the single hole area of the filter and the sum of the areas of all holes. Measure the minimum cross-sectional area of the injection channel.

8.8 Plastic parts test

8.9 Fixing bracket test The test shall be carried out as follows:

8.10 Fire extinguishing agent test

8.11 Propellant test The test shall be carried out using a dew point meter or other methods that can obtain the same results.

9.2.1 General requirements

9.2.2 Product information description At least the following contents and specific requirements are as follows:

9.2.3 Operation Instructions

9.2.4 Inspection instructions The fire extinguisher user shall be informed to carry out an inspection to ensure that.

9.2.5 Instructions for use The following shall be stated.