GB 5135.23-2026 Automatic sprinkler system—Part 23：Glass separation sprinklers English, Anglais, Englisch, Inglés, えいご
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ICS
CCS
National Standard of the People's Republic of China
GB/T 5135.23-2026
Automatic sprinkler system - Part 23：Glass separation sprinklers
自动喷水灭火系统 第23部分：玻璃分隔用洒水喷头
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
Introduction
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification
4.1 Classification by Installation Position
4.2 Classification by Thermal Sensing Element
5 Model Designation
6 Requirements
6.1 Basic Requirements
6.2 Connection Threads
6.3 Appearance and Marking
6.4 Sealing Construction
6.5 Hydrostatic Sealing and Hydrostatic Strength Performance
6.6 Discharge Coefficient
6.7 Water Distribution Performance
6.8 Static Operating Temperature
6.9 Function
6.10 Water Hammer Resistance Performance
6.11 Working Load and Frame Strength
6.12 Thermal Sensing Element Strength
6.13 Deflector Strength
6.14 Fatigue Strength
6.15 Thermal Stability
6.16 Vibration Resistance Performance
6.17 Mechanical Impact Resistance Performance
6.18 Impact Resistance Performance
6.19 Rough Handling Resistance Performance
6.20 Freezing Performance
6.21 High Temperature Resistance Performance
6.22 Dynamic Thermal Performance
6.23 Stress Corrosion Resistance Performance
6.24 Sulfur Dioxide and Carbon Dioxide Corrosion Resistance Performance
6.25 Salt Spray Corrosion Resistance Performance
6.26 Moist Gas Corrosion Resistance Performance
6.27 Ambient Temperature Resistance Performance
6.28 Lateral Spray
6.29 Vacuum Resistance Performance
6.30 Fire Resistance Performance
7 Test Methods
7.1 Visual Inspection
7.2 Mass Measurement
7.3 Hydrostatic Sealing and Hydrostatic Strength Test
7.4 Measurement of Discharge Coefficient
7.5 Water Distribution Test
7.6 Static Operating Temperature Test
7.7 Function Test
7.8 Water Hammer Resistance Test
7.9 Determination of Working Load and Frame Strength Test
7.10 Thermal Sensing Element Strength Test
7.11 Deflector Strength Test
7.12 Fatigue Strength Test
7.13 Thermal Stability Test
7.14 Vibration Resistance Test
7.15 Mechanical Impact Resistance Test
7.16 Impact Resistance Test
7.17 Rough Handling Resistance Test
7.18 Freezing Test
7.19 High Temperature Resistance Test
7.20 Dynamic Thermal Test
7.21 Stress Corrosion Resistance Test
7.22 Sulfur Dioxide and Carbon Dioxide Corrosion Resistance Test
7.23 Salt Spray Corrosion Resistance Test
7.24 Moist Gas Corrosion Resistance Test
7.25 Ambient Temperature Resistance Test
7.26 Lateral Spray Test
7.27 Vacuum Resistance Test
7.28 Fire Resistance Test
8 Inspection Rules
8.1 Classification of Inspection and Items
8.2 Sampling Method
8.3 Determination of Inspection Results
9 Instruction Manual
10 Packaging, Transport and Storage
10.1 Packaging
10.2 Transport
10.3 Storage
Annex A (Normative) Tolerances
Annex B (Informative) Calculation Method for Bulb Breaking Load and Tolerance Limits
B.1 Calculation of Unbiased Standard Deviation
B.2 Calculation of Lower Tolerance Limit TL1 for Bulb Breaking Load
B.3 Calculation of Upper Tolerance Limit TL2 for Bulb Design Load
Annex C (Informative) Analysis of Fusible Element Strength Test
Automatic sprinkler system – Part 23: Sprinklers for glass separation
1 Scope
This document gives the classification and model designation of sprinklers for glass separation (hereinafter referred to as "sprinklers") for automatic sprinkler systems, specifies requirements, inspection rules, instruction manual, packaging, transport and storage, and describes the corresponding test methods.
This document applies to the design, manufacture and inspection of sprinklers for glass separation used in automatic sprinkler systems.
This document does not apply to early suppression fast response (ESFR) sprinklers, residential sprinklers, special application sprinklers and on off sprinklers.
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 5135.1 Automatic sprinkler system – Part 1: Sprinklers
GB/T 7306.2 55° sealing pipe threads – Part 2: Taper internal threads and taper external threads
GB/T 9978.1 Fire resistance tests for building elements – Part 1: General requirements
GB/T 12513 Fire resistance tests for glazed elements
GB/T 26784 Fire resistance tests for building elements – Alternative and additional procedures
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB 5135.1 and the following apply.
3.1 glass separation sprinkler
A fast response sprinkler that automatically activates within a predetermined temperature range and discharges water in a designed spray pattern and flow rate onto glazed elements of a building for cooling protection.
3.2 glazed element
A partition composed of one or more pieces of transparent or translucent glass set into a glass frame.
4 Classification
4.1 Classification by installation position
4.1.1 Pendent glass separation sprinkler
A glass separation sprinkler installed pendently, with water flowing downward to impact the deflector and spray water onto the glass. Classification code: X.
4.1.2 Horizontal glass separation sprinkler
A glass separation sprinkler installed horizontally, with water flowing laterally to impact the deflector and spray water onto the glass. Classification code: S.
4.2 Classification by thermal sensing element
4.2.1 Fusible element glass separation sprinkler
A glass separation sprinkler that activates by the melting of a fusible element alloy when heated. Classification code: Y.
4.2.2 Glass bulb glass separation sprinkler
A glass separation sprinkler that activates by the rupture of a glass bulb due to the expansion of the liquid contained within the bulb when heated. Classification code: Q.
5 Model designation
The model designation method for glass separation sprinklers is as follows:
NOTE: The customized code, specified by the manufacturer, is used to characterize the type of thermal sensing element, product construction, etc. It consists of uppercase English letters, Arabic numerals or a combination thereof, with no more than 3 characters.
Example: ZSTBL XQ 80 68℃ F3 indicates type F3, pendent installation, glass bulb type, nominal discharge coefficient of 80, nominal operating temperature of 68℃, sprinkler for glass separation.
6 Requirements
6.1 Basic requirements
6.1.1 Sprinklers shall not be easily adjustable, disassemblable or reassemblable in design and manufacture.
6.1.2 The deviation of the mass of each sprinkler, measured by the method specified in 7.2, from the manufacturer's declared mass shall not exceed 5%.
6.1.3 The nominal operating temperature and colour coding of sprinklers shall comply with GB 5135.1.
6.1.4 Unless otherwise indicated, tolerances shall comply with Annex A.
6.2 Connection threads
The connection threads of sprinklers shall comply with GB/T 7306.2.
6.3 Appearance and marking
6.3.1 The external surface of sprinklers shall be uniform and consistent, free from obvious impact marks, scratches and deformation. The surface coating or plating shall be intact.
6.3.2 At least the model designation, direction of water flow, manufacturer's name (code) or trademark, year of manufacture, and certification mark (if certified) shall be marked on the deflector or body of the sprinkler. All markings shall be permanent, correct and legible.
6.4 Sealing construction
Rubber seals shall not be used for sealing the water outlet of sprinklers.
6.5 Hydrostatic sealing and hydrostatic strength performance
6.5.1 When tested by the method specified in 7.3.1, sprinklers shall show no leakage throughout the test.
6.5.2 When tested by the method specified in 7.3.2, sprinklers shall show no deformation or damage.
6.6 Discharge coefficient
6.6.1 The discharge coefficient K of a sprinkler shall be calculated according to formula (1).
6.6.2 When tested by the method specified in 7.4, each measured value of the sprinkler discharge coefficient K shall comply with Table 1.
6.7 Water distribution performance
When tested by the method specified in 7.5, the water spray shall completely cover the glass surface without obvious blind spots and shall comply with Table 2.
6.8 Static operating temperature
6.8.1 When tested by the method specified in 7.6, the actual operating temperature of sprinklers shall not exceed the range of X ± (0.035X + 0.62), where X represents the nominal operating temperature in degrees Celsius (°C).
6.8.2 If, within the intended operating temperature range, any sprinkler exhibits partial rupture of the glass bulb or partial operation of the fusible element, an additional air bath test shall be conducted according to 7.6.3, and all sprinklers shall operate fully.
6.9 Function
When tested by the method specified in 7.7, sprinklers shall activate and discharge water, and shall clear all deposits within 10 s after release of the thermal sensing element.
6.10 Water hammer resistance performance
When tested by the method specified in 7.8, sprinklers shall show no leakage or damage during or after the test.
After this test, all specimens shall also be subjected to a function test at a pressure of 0.035 MPa and shall comply with 6.9.
6.11 Working load and frame strength
6.11.1 The working load of yoke arm supported sprinklers shall be determined according to the methods specified in 7.9.1 to 7.9.4.
6.11.2 When tested by the method specified in 7.9.5, the permanent deformation of the frame of yoke arm supported sprinklers shall not exceed 0.2% of the distance between the load support points of the sprinkler.
6.12 Thermal sensing element strength
6.12.1 When tested by the method specified in 7.10.2, glass bulbs shall comply with the following requirements:
a)The average breaking load of the glass bulbs shall be greater than 6 times the average design load.
b) Unless other distributions are demonstrated to be more applicable in production or design, a normal or Gaussian distribution shall be used for calculation. For a confidence coefficient (ν) of 0.99 for 99% of the specimens (p), the lower tolerance limit of the glass bulb breaking load measured and calculated during the test shall be greater than twice the upper tolerance limit of the glass bulb design load.
6.12.2 When tested by the method specified in 7.10.3, fusible elements shall withstand 15 times the maximum design load for 100 hours, or shall satisfy the requirements of formula (2).
6.13 Deflector strength
When tested by the method specified in 7.11, the deflector of sprinklers shall not become loose, detach, permanently deform or be damaged.
6.14 Fatigue strength
When tested by the method specified in 7.12, glass bulb sprinklers shall show no damage to the glass bulb. After this test, all specimens shall also be subjected to a function test at a pressure of 0.035 MPa and shall comply with 6.9.
6.15 Thermal stability
When tested by the method specified in 7.13, glass bulb sprinklers shall show no damage to the glass bulb. After this test, all specimens shall also be subjected to a function test at a pressure of 0.035 MPa and shall comply with 6.9.
6.16 Vibration resistance performance
When tested by the method specified in 7.14, the component parts of sprinklers shall not become loose or damaged. After this test, all specimens shall also be subjected to a hydrostatic sealing test and a function test at a pressure of 0.035 MPa, and shall comply with
6.5.1 and 6.9.
6.17 Mechanical impact resistance performance
When tested by the method specified in 7.15, sprinklers shall show no damage. After this test, all specimens shall also be subjected to a hydrostatic sealing test and shall comply with 6.5.1.
6.18 Impact resistance performance
