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GB 25972-2024: Gas fire extinguishing systems and components
Status: Valid GB 25972: Evolution and historical versions
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PDF similar to GB 25972-2024
Standard similar to GB 25972-2024 GB 4066 GA 578 GB 5135.3 GB 20031 GB 36660 Basic data | Standard ID | GB 25972-2024 (GB25972-2024) | | Description (Translated English) | Gas fire extinguishing systems and components | | Sector / Industry | National Standard | | Classification of Chinese Standard | C83 | | Classification of International Standard | 13.220.10 | | Word Count Estimation | 110,171 | | Date of Issue | 2024-11-28 | | Date of Implementation | 2025-12-01 | | Older Standard (superseded by this standard) | GB 25972-2010 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB 25972-2024: Gas fire extinguishing systems and components---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 13.220.10
CCSC83
National Standard of the People's Republic of China
Replaces GB 25972-2010
Gas fire extinguishing systems and components
Released on 2024-11-28
2025-12-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface VII
1 Scope 1
2 Normative references 1
3 Terms and Definitions 2
4 Model compilation method 4
4.1 Method for compiling fire extinguishing system model
4.2 Component model compilation method 4
5 Requirements 5
5.1 General requirements 5
5.2 Fire extinguishing system 6
5.3 Bottle Group 9
5.4 Nozzle 17
5.5 Selector valve 19
5.6 Check valve 20
5.7 Collector 21
5.8 Connecting pipe 21
5.9 Drive device 22
5.10 Control device 22
5.11 Signal feedback device 23
5.12 Pressure reducing device 24
5.13 Low leakage high sealing valve 25
5.14 Pipe fittings 25
5.15 Support bracket 26
5.16 Flow design calculation and verification 26
5.17 Protection zone pressure relief device 28
6 Test methods 29
6.1 Test requirements 29
6.2 Inspection of appearance, markings, documents, materials, fire extinguishing agents, pressurized gases, containers and gas cylinders 29
6.3 Hydraulic strength test 30
6.4 Air tightness test 30
6.5 Salt spray corrosion test 31
6.6 Stress corrosion test 31
6.7 Sulfur dioxide corrosion test 32
6.8 Voltage Withstand Test 33
6.9 Insulation resistance test 33
6.10 Fire extinguishing system test 34
6.11 Monitoring information type check 34
6.12 State sensing unit test 34
6.13 Data transmission unit test 34
6.14 DTU data application platform test 35
6.15 Bottle group filling density and filling pressure test 35
6.16 Vibration test 35
6.17 Temperature cycle leak test 36
6.18 Bottle group tipping impact test 37
6.19 Impact test of accidental discharge protection device 38
6.20 Fire extinguisher bottle set release time 38
6.21 External pressure fire extinguishing agent cylinder group characteristic test 38
6.22 Overpressure test 39
6.23 Working reliability test 39
6.24 Action test under maximum and minimum working pressure 40
6.25 Local resistance loss test 41
6.26 Container valve pressure relief performance test 42
6.27 Manual operation test 43
6.28 Contact resistance test 43
6.29 Weighing device alarm function test 43
6.30 High and Low Temperature Test 43
6.31 Weighing device overload test 43
6.32 Protection level 43
6.33 Check the pressure indicator dial and display screen 43
6.34 Basic error test of pressure display indication 44
6.35 Pressure indicator alternating load test 44
6.36 Pressure display alarm function test 44
6.37 Digital pressure display power supply test 44
6.38 Liquid level measuring device alarm function test 44
6.39 Safety relief device action test 44
6.40 Safety relief device release capacity test 45
6.41 Nozzle protection cap test 45
6.42 Nozzle flow characteristics test 45
6.43 Nozzle heat and pressure test 46
6.44 Nozzle heat and cold shock test 47
6.45 Nozzle impact resistance test 47
6.46 Total flooding nozzle spray characteristics test 48
6.47 Nozzle noise test 52
6.48 Check valve opening pressure test 54
6.49 Manifold flow test 54
6.50 Hot air aging test for non-metallic connecting pipes 54
6.51 Low temperature test of non-metallic connecting pipes 54
6.52 Drive device signal feedback function test 54
6.53 Control device test 54
6.54 Signal feedback device action test 55
6.55 Pressure relief device pressure relief performance test 55
6.56 High voltage impact test 56
6.57 Low leakage high sealing valve closing pressure test 56
6.58 Coating Test 56
6.59 Load-bearing capacity test 56
6.60 Cyclic loading test 57
6.61 Fatigue test 57
6.62 Action pressure test of pressure relief device in protection area 57
6.63 Test of effective pressure relief area of pressure relief device in protection area 57
6.64 Low temperature resistance test of pressure relief device in protection area 57
6.65 High temperature resistance test of pressure relief device in protection area 57
6.66 Fire resistance test 57
6.67 Air leakage test 57
6.68 Negative pressure resistance test 58
7 Inspection Rules 58
7.1 Inspection categories, inspection items and test procedures 58
7.2 Sampling method and sample size 64
7.3 Determination of test results 64
8 User Manual 65
9 Fire extinguishing agent filling 65
10 Packaging, transportation and storage 65
10.1 Packaging 65
10.2 Transport 65
10.3 Storage 65
Appendix A (Informative) Method for compiling component models 66
Appendix B (Normative) Method for determining the maximum working pressure and minimum working pressure at different filling densities 68
B.1 Test conditions 68
B.2 Test Procedure 68
Appendix C (Informative) DTU data application platform, SSU and DTU connection relationship example 69
C.1 DTU Function Description 69
C.2 Example of DTU data application platform, SSU and DTU connection relationship 69
Appendix D (Informative) Fire Extinguishing Concentrations for Class B n-heptane Fires and Class A Wood Stack Surface Fires
Appendix E (Informative) Test method for determining the extinguishing concentration of n-heptane for Class B and Class A wood pile surface fires 73
E.1 Experimental Space 73
E.2 Measurement parameters 73
E.3 Test fire extinguishing system 73
E.4 Conditions for determining fire extinguishing concentration 73
E.5 Class B n-heptane fire extinguishing test 74
E.6 Class A wood pile fire extinguishing test 75
Appendix F (Normative) Fire Extinguishing System Test Procedure and Sample Quantity 77
F.1 Test procedure 77
F.2 Number of samples 77
Appendix G (Normative) Test procedures and sample quantity for fire extinguishing agent bottles 78
G.1 Test procedure 78
G.2 Sample quantity 78
Appendix H (Normative) Test procedures and sample quantities for driving gas cylinders and starting gas cylinders 79
H.1 Test procedure 79
H.2 Number of samples. 79
Appendix I (Normative) Test procedures and sample quantities for containers and gas cylinders 80
I.1 Test procedure 80
I.2 Sample quantity 80
Appendix J (Normative) Container Valve Test Procedure and Sample Quantity 81
J.1 Test procedure 81
J.2 Sample quantity 81
Appendix K (Normative) Weighing device test procedure and sample quantity 82
K.1 Test procedure 82
K.2 Sample quantity 82
Appendix L (Normative) Pressure Indicator Test Procedure and Sample Quantity 83
L.1 Test procedure83
L.2 Number of samples. 84
Appendix M (Normative) Test procedures and sample quantities for level measuring devices 85
M.1 Test procedure 85
M.2 Sample quantity 85
Appendix N (Normative) Safety relief device test procedures and sample quantity 86
N.1 Test procedure 86
N.2 Number of samples. 86
Appendix O (Normative) Nozzle test procedure and sample quantity 87
O.1 Test procedure 87
O.2 Number of samples. 87
Appendix P (Normative) Selection Valve Test Procedure and Sample Quantity 88
P.1 Test Procedure 88
P.2 Sample quantity 88
Appendix Q (Normative) Check Valve Test Procedure and Sample Quantity 89
Q.1 Test procedure 89
Q.2 Sample quantity 89
Appendix R (Normative) Manifold Test Procedure and Sample Quantity 90
R.1 Test procedure 90
R.2 Sample quantity 90
Appendix S (Normative) Connection pipe test procedure and sample quantity 91
S.1 Test procedure 91
S.2 Sample quantity 91
Appendix T (Normative) Drive device test procedure and sample quantity 92
Appendix U (Normative) Control device test procedures and sample quantities 93
U.1 Test Procedure 93
U.2 Sample quantity 93
Appendix V (Normative) Signal Feedback Device Test Procedure and Sample Quantity 94
V.1 Test Procedure 94
V.2 Sample quantity 94
Appendix W (Normative) Pressure Relief Device Test Procedure and Sample Quantity 95
W.1 Test procedure 95
W.2 Sample quantity 95
Appendix X (Normative) Low Leakage High Seal Valve Test Procedure and Sample Quantity 96
X.1 Test procedure 96
X.2 Sample quantity 96
Appendix Y (Normative) Pipe fitting test procedures and sample quantities 97
Y.1 Test procedure 97
Y.2 Sample quantity 97
Appendix Z (Normative) Support and hanger test procedures and sample quantity 98
Z.1 Test procedure 98
Z.2 Sample quantity 98
Appendix AA (Normative) Test procedures and sample quantities for pressure relief devices in protected areas 99
AA.1 Test Procedure 99
AA.2 Sample quantity 99
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB 25972-2010 "Gas fire extinguishing systems and components". Compared with GB 25972-2010, except for structural adjustments and editing
In addition to the changes in performance, the main technical changes are as follows.
a) The scope of application has been changed (see Chapter 1, Chapter 1 of the.2010 edition);
b) The definitions of "maximum working pressure of fire extinguishing system" and "injection time" have been changed (see 3.4, 3.9, 3.1, 3.8 of the.2010 edition);
c) Added "External storage pressure gas fire extinguishing system", "Bottle group storage pressure", "Bottle group maximum working pressure" and "Bottle group minimum working pressure"
"Noise reduction nozzle", "State sensing unit (SSU)", "Data transmission unit (DTU)", "Protection zone pressure relief device", "Effective pressure relief surface
The terms and definitions of "pressure", "driving device" and "safety relief device operating pressure" (see 3.2, 3.6, 3.7, 3.8, 3.11, 3.12, 3.13,
3.14, 3.15, 3.16, 3.17);
d) The “method for compiling the model of fire extinguishing system” and “method for compiling the model of components” have been changed (see 4.1 and 4.2, 4.1 and 4.2 of the.2010 edition);
e) The operating temperature range and working pressure requirements of the fire extinguishing system have been changed (see 5.2.1.1, 5.2.1.3, 5.1.1.1,.2010 edition
5.1.1.2);
f) Added the requirements for the composition of the external pressure-type fire extinguishing system (see 5.2.2.2);
g) Added the functional requirements and test methods for fire extinguishing system status monitoring and data application platform (see 5.2.6, 6.12, 6.13, 6.14);
h) Changed the requirements for bottle group composition (see 5.3.1.1, 5.2.1 and 5.3.1 of the.2010 edition) and the requirements for bottle group filling density (see 5.3.3,
5.2.3 of the.2010 edition) and requirements for accidental discharge protection devices (see 5.3.9, 5.2.10 of the.2010 edition);
i) Added the requirements for cylinder group structure (see 5.3.1.2), cylinder group characteristics and test methods of external pressure fire extinguishing agent cylinder group (see 5.3.12,
6.21), filling density and filling pressure test method of bottle group (see 6.15), impact resistance test method of accidental discharge protection device (see
6.19);
j) Changed the requirements for containers and gas cylinders (see 5.3.14, 5.4 of the.2010 edition);
k) Changed the requirements for the reliability and local resistance loss of container valves (see 5.3.15.4, 5.3.15.6, 5.5.8,.2010 edition)
5.5.9) Action test method under maximum and minimum working pressure (see 6.24, 6.7 of the.2010 edition);
l) Added requirements and test methods for pressure relief container valves (see 5.3.15.8 and 6.26);
m) The general requirements for pressure indicators have been changed (see 5.3.16.2.1, 5.14.2.1 of the.2010 edition);
n) Added the requirements for the display screen of the digital pressure display (see 5.3.16.2.3) and the power supply requirements (see 5.3.16.2.9);
o) The requirements for the release action pressure of the safety relief device (see 5.3.17.1, 5.11.1 of the.2010 edition), the safety relief device action pressure, and the safety relief device action pressure have been changed.
Test method (see 6.39, 6.15 of the.2010 edition);
p) Added the discharge capacity requirements and test methods of safety discharge devices (see 5.3.17.4 and 6.40);
q) The nozzle size requirements (see 5.4.1, 5.6.2 of the.2010 edition) and the test method for the spray characteristics of fully submerged nozzles (see 6.46,
6.21 of the.2010 edition);
r) Added the requirements for noise reduction nozzle jet noise and its test methods (see 5.4.8 and 6.47);
s) Changed the requirements for selector valve operating reliability (see 5.5.3, 5.7.6 of the.2010 edition);
t) Added the requirements for the feedback function of the selector valve opening and closing status signal (see 5.5.7);
u) Added drive device signal feedback requirements and test methods (see 5.9.2, 6.52);
v) Added the function of preventing accidental spraying of the control device (see 5.10.2), fault alarm and self-checking function requirements (see 5.10.3);
w) Changed the action pressure requirements of the signal feedback device (see 5.11.2, 5.15.2 of the.2010 edition);
x) Added high pressure impact resistance performance of pressure relief devices (see 5.12.4), corrosion resistance requirements (see 5.12.5) and high pressure impact resistance test
Methods (see 6.56);
y) The decompression performance test method of the decompression device has been changed (see 6.55, 6.38 of the.2010 edition);
z) Changed the low leakage high sealing valve setting requirements (see 5.13.1, 5.17.1 of the.2010 edition), the nominal working pressure requirements (see 5.13.2,
5.17.3 of the.2010 edition);
aa) Added requirements and test methods for seismic support and hanger brackets (see 5.15.3 to 5.15.5, 6.59 to 6.61);
ab) Added flow design calculation and verification (see 5.16);
ac) Added requirements and test methods for pressure relief devices in protected areas (see 5.17, 6.2, 6.5, 6.16.3, 6.23.5, 6.62~6.68);
ad) The type inspection items and factory inspection items have been changed (see Table 9, Table 4 of the.2010 edition);
ae) Added packaging, transportation and storage requirements (see Chapter 10);
af) Added the method for determining the maximum working pressure and minimum working pressure under different filling densities (see Appendix B);
ag) Added the test procedure and sample quantity for the protection area pressure relief device (see Appendix AA).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed and coordinated by the National Fire and Rescue Administration.
The previous versions of this document and the documents it replaces are as follows.
---First published in.2011 as GB 25972;
---This is the first revision.
Gas fire extinguishing systems and components
1 Scope
This document specifies the gas fire extinguishing system (hereinafter referred to as the "fire extinguishing system") and its components (status sensing unit, data transmission unit, bottle
Group, nozzle, selector valve, check valve, manifold, connecting pipe, safety relief device, drive device, control device, signal feedback device, pressure reducing device
requirements, flow design calculation and verification, inspection rules, and instructions for use
The book, filling and packaging of fire extinguishing agents, transportation, storage, etc., gives the model compilation method and describes the corresponding test methods.
This document is applicable to fire extinguishing systems of chemical synthetic fire extinguishing agents such as heptafluoropropane (HFC227ea) and IG-01 (argon), IG-100 (nitrogen)
Design, manufacture and maintenance of inert gas extinguishing systems such as IG-55 (argon, nitrogen), IG-541 (argon, nitrogen, carbon dioxide)
test.
This document does not apply to halogen fire extinguishing systems, high-pressure and low-pressure carbon dioxide fire extinguishing systems, suspended gas fire extinguishing devices and cabinet gas
Fire extinguishing equipment.
2 Normative references
The contents of the following documents constitute essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 150 (all parts) Pressure vessels
GB/T 567.1-2012 Bursting disc safety devices Part 1.Basic requirements
GB/T 672 Chemical reagent magnesium chloride hexahydrate (magnesium chloride)
GB/T 4208-2017 Enclosure protection degree (IP code)
GB 4396 Carbon dioxide fire extinguishing agent
GB 4717-2024 Fire alarm controller
GB/T 4956 Measurement of coating thickness of non-magnetic coatings on magnetic substrates - Magnetic method
GB/T 5099.1 Seamless steel gas cylinders Part 1.Steel cylinders with a tensile strength of less than 1100 MPa after quenching and tempering
GB/T 5099.4 Seamless steel gas cylinders Part 4.Seamless stainless steel gas cylinders
GB/T 5100 Steel welded gas cylinders
GB/T 6052 Industrial liquid carbon dioxide
GB/T 7551 Load Cell
GB/T 8979 Pure nitrogen, high purity nitrogen and ultra-pure nitrogen
GB/T 9969 General principles for instructions for use of industrial products
GB/T 9978.1-2008 Fire resistance test methods for building components Part 1.General requirements
GB/T 11640 Aluminum alloy seamless gas cylinders
GB/T 13384 General technical requirements for packaging of electromechanical products
GB 15930-2007 Fire dampers for building ventilation and smoke exhaust systems
GB 18614 Heptafluoropropane (HFC227ea) fire extinguishing agent
GB/T 18806 General specification for resistance strain gauge pressure sensors
GB.20128 Inert gas fire extinguishing agent
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