GB 4452-2026 Outdoor fire hydrant English, Anglais, Englisch, Inglés, えいご
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ICS
CCS
National Standard of the People's Republic of China
GB/T 4452-2026
Outdoor fire hydrant
室外消火栓
Issue date: 2026-01-28 Implementation date: 2027-02-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification and Model
4.1 Types and Specifications
4.2 Model
5 Technical Requirements
5.1 Construction
5.2 Materials
5.3 Appearance Quality
5.4 Threads
5.5 Direction of Opening and Closing
5.6 Lifting Height
5.7 Inlet Connection Dimensions
5.8 Sealing Performance
5.9 Hydrostatic Strength
5.10 Residual Water Drainage Device
5.11 Fire Coupling
5.12 Impact Resistance Performance
5.13 Pressure Regulating Performance
5.14 Pressure Reducing and Stabilizing Performance
5.15 Tilt Angle Monitoring Performance
5.16 Pressure Monitoring Performance
5.17 Valve Opening Monitoring Function
5.18 Position Information Display Function
5.19 Flow Monitoring Performance
5.20 High and Low Temperature Resistance Performance
5.21 Damp Heat Steady State Performance
5.22 Vibration and Impact Resistance Performance
5.23 Enclosure Protection Performance
5.24 Electrostatic Discharge Immunity Performance
5.25 Radiated Radio-Frequency Electromagnetic Field Immunity Performance
5.26 Folding Performance
5.27 Fire Hydrant Wrench
6 Test Methods
6.1 Construction Inspection
6.2 Material Inspection
6.3 Appearance Quality Inspection
6.4 Thread Inspection
6.5 Direction of Opening and Closing Inspection
6.6 Lifting Height Inspection
6.7 Inlet Connection Dimension Inspection
6.8 Sealing Performance Test
6.9 Hydrostatic Strength Test
6.10 Residual Water Drainage Device Inspection
6.11 Fire Coupling Inspection
6.12 Impact Resistance Test
6.13 Pressure Regulating Performance Test
6.14 Pressure Reducing and Stabilizing Performance Test
6.15 Tilt Angle Monitoring Performance Test
6.16 Pressure Monitoring Performance Test
6.17 Valve Opening Monitoring Function Test
6.18 Position Information Display Function Inspection
6.19 Flow Monitoring Performance Test
6.20 High and Low Temperature Resistance Performance
6.21 Damp Heat Steady State Performance Test
6.22 Vibration and Impact Resistance Performance Test
6.23 Enclosure Protection Performance
6.24 Electrostatic Discharge Immunity Performance
6.25 Radiated Radio-Frequency Electromagnetic Field Immunity Performance
6.26 Folding Performance Test
6.27 Fire Hydrant Wrench Test
6.28 Hydrostatic Test Apparatus
7 Inspection Rules
7.1 Type Inspection
7.2 Factory Inspection
8 Marking
9 Packaging
Annex A (Normative) Fire Hydrant Wrench
A.1 Product Classification
A.2 Model Designation
A.3 Technical Requirements
A.4 Test Methods
Outdoor fire hydrant
1 Scope
This document defines the terms for outdoor fire hydrants; specifies the classification and model, technical requirements, inspection rules, marking and packaging of outdoor fire hydrants; and describes the corresponding test methods.
This document applies to various types of outdoor fire hydrants and fire hydrant wrenches used in fire protection water supply pipelines.
2 Normative References
The contents of the following documents constitute essential provisions of this document through normative reference. For dated references, only the edition cited applies. For undated references, the latest edition (including all amendments) applies.
GB/T 197 General purpose metric screw threads — Tolerances
GB/T 230.1 Metallic materials — Rockwell hardness test — Part 1: Test method
GB/T 699 High-quality carbon structural steels
GB/T 1176 Cast copper and copper alloys
GB/T 1348 Spheroidal graphite iron castings
GB/T 1804 General tolerances — Tolerances for linear and angular dimensions without individual tolerance indications
GB/T 2423.1 Environmental testing — Part 2: Test methods — Test A: Cold
GB/T 2423.2 Environmental testing — Part 2: Test methods — Test B: Dry heat
GB/T 2423.3 Environmental testing — Part 2: Test methods — Test Cab: Damp heat steady state
GB/T 2423.10 Environmental testing — Part 2: Test methods — Test Fc: Vibration (sinusoidal)
GB/T 4208-2017 Degrees of protection provided by enclosure (IP code)
GB/T 7307 55° non-sealing pipe threads
GB/T 9439 Grey iron castings
GB 12514 Fire coupling technical specifications
GB/T 17241.1 Cast iron pipe flanges — Part 1: PN series
GB/T 17626.2-2018 Electromagnetic compatibility — Testing and measurement techniques — Electrostatic discharge immunity test
GB/T 17626.3-2023 Electromagnetic compatibility — Testing and measurement techniques — Part 3: Radiated radio-frequency electromagnetic field immunity test
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 fire hydrant
A device connected to a water supply pipeline, consisting of a valve, outlets and a body, used for fire water supply or foam solution supply.
3.2 outdoor fire hydrant
A fire hydrant installed in the open air.
3.3 overground fire hydrant
An outdoor fire hydrant with its valve, outlets and part of its body exposed above ground.
3.4 underground fire hydrant
An outdoor fire hydrant installed underground.
3.5 crashworthy post fire hydrant
An overground fire hydrant which, when impacted, only breaks at a specific component while the hydrant body and valve body remain undamaged and no water leakage occurs.
3.6 pressure reducing-stabilized fire hydrant
An outdoor fire hydrant that can reduce the outlet pressure at the hose coupling to a specific value and automatically maintain that outlet pressure stable when the inlet pressure is within a specified range.
3.7 pressure regulating fire hydrant
An outdoor fire hydrant whose outlet pressure can be adjusted within a certain range while the inlet pressure is maintained constant within a specified range.
3.8 intelligent fire hydrant
An outdoor fire hydrant that has at least the functions of tilt angle monitoring, pressure monitoring, valve opening monitoring and position information feedback.
3.9 folding fire hydrant
An outdoor fire hydrant that is normally installed underground in a folded or telescoped form and can be raised above ground for use.
3.10 fire hydrant wrench
A tool capable of opening and closing a fire hydrant.
4 Classification and model
4.1 Types and specifications
4.1.1 Outdoor fire hydrants (hereinafter referred to as "outdoor hydrants") can be classified by installation type into overground type, underground type and folding type.
4.1.2 Outdoor hydrants can be classified by application into general purpose and special purpose. Special purpose includes foam type, crashworthy type, pressure regulating type, pressure reducing-stabilized type, intelligent type, etc.
4.1.3 Outdoor hydrants can be classified by nominal size of the inlet into DN100 and DN150.
4.1.4 Outdoor hydrants can be classified by rated working pressure into 1.6 MPa and 2.5 MPa.
4.2 Model
The model designation method for outdoor hydrants is as follows:
Example 1: An underground fire hydrant with an inlet nominal size of DN100, a rated working pressure of 1.6 MPa, a suction hose connection of 100 mm and a hose connection of 65 mm is designated as: SA100/65-1.6.
Example 2: A crashworthy overground fire hydrant with an inlet nominal size of DN150, a rated working pressure of 1.6 MPa, a suction hose connection of 150 mm and a hose connection of 80 mm is designated as: SSF150/80-1.6.
Example 3: A crashworthy pressure reducing-stabilized overground fire hydrant with an inlet nominal size of DN100, a rated working pressure of 1.6 MPa, a suction hose connection of 100 mm and a hose connection of 65 mm is designated as: SSFW100/65-1.6.
Example 4: An overground foam fire hydrant with an inlet nominal size of DN100, a rated working pressure of 1.6 MPa, a suction hose connection of 100 mm and a hose connection of 65 mm is designated as: SSP100/65-1.6.
Example 5: An intelligent overground fire hydrant with an inlet nominal size of DN150, a rated working pressure of 2.5 MPa, a suction hose connection of 150 mm, a hose connection of 80 mm and flow monitoring capability is designated as: SSZL150/80-2.5.
5 Technical requirements
5.1 Construction
5.1.1 Except for pressure regulating type and pressure reducing-stabilized type fire hydrants, the construction of outdoor hydrants shall ensure that the minimum internal flow area of the hydrant in use is not less than 85% of the nominal size area.
5.1.2 Outdoor hydrants shall be opened and closed using a fire hydrant wrench complying with Annex A. No anti-theft, encryption or any other construction that affects the normal use of the fire hydrant wrench shall be adopted.
5.2 Materials
5.2.1 The body, valve body, flange adapter and elbow of outdoor hydrants shall be made of grey cast iron HT200 conforming to GB/T 9439, or other metal materials with mechanical properties not lower than those of HT200. For crashworthy type fire hydrants, the body shall be made of grey cast iron HT250 conforming to GB/T 9439, or other metal materials with mechanical properties not lower than those of HT250.
5.2.2 The valve seat, stem nut, hose connection and suction hose connection of outdoor hydrants shall be made of cast copper alloy ZCuZn38 conforming to GB/T 1176, or other metal materials with mechanical properties and corrosion resistance not lower than those of ZCuZn38.
5.2.3 The valve stem of outdoor hydrants shall be made of a metal material with corrosion resistance not lower than that of austenitic stainless steel 06Cr19Ni10; if made of low-carbon steel, the surface shall be chromium-plated or treated with other surface treatment methods with performance not lower than chromium plating. For foam fire hydrants, the guide tube and connecting pin of the valve stem shall be made of a metal material with corrosion resistance not lower than that of austenitic stainless steel 06Cr19Ni10.
5.3 Appearance quality
5.3.1 The surface of iron castings of outdoor hydrants shall be smooth. Both internal and external surfaces shall be spray-coated or otherwise treated against corrosion. The exposed upper part shall be red in colour. The coating shall be uniform in colour and lustre, free from cracking, obvious scratches and impact damage.
5.3.2 The surface of copper alloy castings or stainless steel castings of outdoor hydrants shall be free from obvious sand holes, gas pores, cracks and other defects.
5.4 Threads
The basic dimensions and tolerances of pipe threads of outdoor hydrants shall comply with GB/T 7307. The tolerances of general purpose metric screw threads shall comply with the requirements of Class 7H for internal threads and Class 8g for external threads in GB/T 197. Threads shall be free from missing teeth and shall have a smooth surface.
5.5 Direction of opening and closing
