GB 4351-2023 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 4351-2023 | English | 1070 |
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Portable fire extinguishers
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| GB 4351.1-2005 | English | 145 |
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Portable fire extinguishers -- Part 1: Performance and construction
| Obsolete |
| GB 4351-1997 | English | 879 |
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General specifications for portable fire extinguishers
| Obsolete |
| GB 4351-1984 | English | RFQ |
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General specifications for portable fire extinguishers
| Obsolete |
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GB 4351-2023: Portable fire extinguishers---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/GB4351-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.220.10
CCS C 84
Replacing GB 4351.1-2005, GB 4351.2-2005, GB/T 4351.3-2005
Portable fire extinguishers
Issued on. DECEMBER 28, 2023
Implemented on. JANUARY 01, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 4
1 Scope... 7
2 Normative references... 7
3 Terms and definitions... 8
4 Classification and model... 11
4.1 Classification... 11
4.2 Model... 11
5 Performance requirements for fire extinguishers... 12
6 Performance requirements for fire extinguisher components... 19
7 Test methods for fire extinguishers... 23
8 Test methods for fire extinguisher components... 41
9 Colors and marks... 46
10 Instructions... 50
11 Inspection rules... 51
12 Packaging, transportation and storage... 53
Annex A (normative) Characteristic parameters, steel stamp marking content and
cylinder valve assembly torque of seamless carbon dioxide fire extinguisher cylinders
... 55
Annex B (normative) Low-pressure cylinder of portable fire extinguisher... 58
Annex C (normative) Valves of Portable fire extinguishers... 65
Annex D (normative) Pressure gauge... 79
Annex E (informative) Vibration test device for dry powder fire extinguisher... 87
Annex F (informative) Test methods for class D fires... 90
1 Scope
This document gives the terms and definitions, classification and models of portable
fire extinguishers (hereinafter referred to as fire extinguishers). It specifies the
performance requirements, colors and marks, manuals, inspection rules, packaging,
transportation and storage of portable fire extinguishers and components. It describes
the test methods.
This document applies to the design, manufacture and inspection of portable fire
extinguishers and their components used in industrial and civil buildings.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (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 -- Tolerance 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, Carbon dioxide extinguishing agent
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 strengthless than 1 100 MPa
GB/T 5231, Designation and chemical composition of wrought copper and copper
alloys
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 4968,
GB/T 5907.5, GB/T 13005 as well as the followings apply.
3.1 portable fire extinguishers
Carbon dioxide fire extinguishers with a total mass not exceeding 23 kg and other types
of fire extinguishers with a total mass not exceeding 20 kg.
3.2 charge of extinguisher
The volume (L) of fire extinguishing agent filled in a water-based fire extinguisher or
the mass (kg) of fire extinguishing agent filled in other types of fire extinguishers.
3.3 effective discharge time
When the fire extinguisher valve is fully opened, the time from the beginning of the
extinguishing agent discharging from the fire extinguisher nozzle to the appearance of
the gaseous point of the jet flow.
3.4 complete discharge
When the fire extinguisher valve is fully open, the internal pressure of the fire
extinguisher reaches the state where the external pressure is equal.
3.5 bulk range
The distance between the farthest point of the jet and the nozzle of the fire extinguisher
when the extinguishing dose is 50%.
4 Classification and model
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 Performance requirements for fire extinguishers
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 Discharge performance
5.3.1 Discharge performance at 20°C
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 Sealing performance
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 Performance requirements for fire extinguisher components
6.1 Cylinder
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.
6.5.2 Configuration and length requirements
6.5.3 Pressure resistance
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.
6.5.5 Requirements for nozzles and horns of carbon dioxide fire extinguishers
6.6 Filters for water-based fire extinguishers
7 Test methods for fire extinguishers
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.
7.2 Discharge performance test
7.3 Mechanical properties test
7.3.1 Impact resistance test
The test shall be carried out according to the following steps.
7.3.2 Vibration resistance test
7.4 Sealing performance test
8 Test methods for fire extinguisher components
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 Discharge hose test
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.
8.7 Rubber sealing ring test
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 Colors and marks
9.1 Colors
The color of the fire extinguisher cylinder body shall be R03 bright red as specified in GB/T 3181.
9.2 Marks
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.
9.2.6 Refilling and repair instructions
The following shall be stated.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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