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GB 5135.21-2025: Automatic sprinkler system - Part 21: Inspector test connection
GB 5135.21: Evolution and historical versions
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Automatic sprinkler system - Part 21: Inspector test connection
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GB 5135.21-2025
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Automatic sprinkler system -- Part 21: Inspector＇s test connection
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GB 5135.21-2011
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Basic data
| Standard ID | GB 5135.21-2025 (GB5135.21-2025) |
| Description (Translated English) | Automatic sprinkler system - Part 21: Inspector test connection |
| Sector / Industry | National Standard |
| Classification of Chinese Standard | C84 |
| Classification of International Standard | 13.220.10 |
| Word Count Estimation | 22,212 |
| Date of Issue | 2025-10-31 |
| Date of Implementation | 2026-11-01 |
| Older Standard (superseded by this standard) | GB 5135.21-2011 |
| Issuing agency(ies) | State Administration for Market Regulation and Standardization Administration of China |
GB 5135.21-2025: Automatic sprinkler system - Part 21: Inspector test connection
---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
CCSC84
National Standards of the People's Republic of China
Replaces GB 5135.21-2011
Automatic sprinkler system
Part 21.End-of-line test equipment
Part 21.Inspector's testconnection
Published on 2025-10-31
Implemented on 2026-11-01
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of contents
Preface III
Introduction V
1.Scope 1
2 Normative References 1
3.Terms and Definitions 1
4.Classification and Model Numbering 2
4.1 Classification 2
4.2 Model Numbering 2
5 Requirements 2
5.1 Appearance 2
5.2 Rated working pressure 3
5.3 Materials 3
5.4 Structure and Components 3
5.5 Flow coefficient 3
5.6 Strength performance 3
5.7 Sealing performance 3
5.8 Function 4
5.9 Operational Reliability 4
5.10 Salt spray corrosion resistance 4
5.11 Overload capacity 4
5.12 Withstand Voltage Performance 4
5.13 Insulation performance 4
5.14 Contact Resistance 4
5.15 Operating Power Supply 4
5.16 Environmental adaptability 5
5.17 Electromagnetic compatibility performance 5
6.Test Methods
6.1 General Requirements 6
6.2 Inspection of appearance, materials, structure and components 6
6.3 Flow Coefficient Test 6
6.4 Strength Test 6
6.5 Sealing Test 6
6.6 Functional Testing 6
6.7 Operational reliability test 7
6.8 Salt spray corrosion resistance test 7
6.9 Overload Capacity Test 8
6.10 Withstand Voltage Test 8
6.11 Insulation Resistance Test 8
6.12 Contact Resistance Test 8
6.13 Operating Power Supply 8
6.14 Environmental Condition Resistance Test 8
6.15 Electromagnetic Compatibility Test 9
7 Inspection Rules 9
7.1 Inspection Classification and Items 9
7.2 Sampling Methods 11
7.3 Judgment of Test Results 11
8.Markings and instruction manuals 11.
8.1 Mark 11
8.2 Instruction Manual 11
9 Packaging, transportation and storage 12
9.1 Packaging 12
9.2 Transportation 12
9.3 Storage 12
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document is Part 21 of GB 5135 "Automatic Sprinkler Systems". GB 5135 has already published the following parts.
---Part 1.Sprinkler Heads;
---Part 2.Wet alarm valves, delay devices, and hydraulic alarm bells;
---Part 3.Water Mist Nozzles;
---Part 4.Dry Alarm Valves;
---Part 5.Deluge Alarm Valve;
---Part 6.General Valves;
---Part 7.Water Flow Indicators;
---Part 8.Accelerator;
---Part 9.Early Suppression Fast Response (ESFR) Nozzles;
---Part 10.Pressure Switches;
---Part 11.Grooved Pipe Fittings;
---Part 13.Water Curtain Nozzles;
---Part 14.Pre-action device;
---Part 15.Household Sprinklers;
---Part 16.Fire Sprinkler Hose;
---Part 17.Pressure Reducing Valves;
---Part 18.Fire Protection Pipe Supports;
---Part 19.Plastic Pipes and Fittings;
---Part 20.Coated Steel Pipes;
---Part 21.End-of-line test device;
---Part 22.Special Application Nozzles
This document supersedes GB 5135.21-2011 "Automatic sprinkler systems - Part 21.Terminal test devices", and is consistent with GB 5135.21-
Compared to.2011, aside from structural adjustments and editorial changes, the main technical changes are as follows.
a) The appearance requirements have been changed (see 5.1, 6.1 in the.2011 version);
b) The rated operating pressure requirements have been changed (see 5.2, 6.2 in the.2011 edition);
c) The material requirements have been changed (see 5.3, 6.3 in the.2011 edition);
d) The structural and component requirements have been changed (see 5.4, 6.4, 6.8.3, and 6.16 in the.2011 edition);
e) The flow coefficient requirements have been changed (see 5.5, 6.5 in the.2011 edition);
f) Feature requirements have been changed (see 5.8, 6.8 in the.2011 version);
g) The operational reliability requirements have been changed (see 5.9, 6.9 in the.2011 edition);
h) The insulation performance requirements have been changed (see 5.13, 6.13 in the.2011 edition);
i) Environmental adaptability requirements and corresponding test methods have been added (see 5.16 and 6.14);
j) Electromagnetic compatibility performance and corresponding test methods have been added (see 5.17 and 6.15).
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed and is under the jurisdiction of the State Fire and Rescue Administration.
The release history of this document and the document it replaces is as follows.
---First published in.2011 as GB 5135.21-2011;
---This is the first revision.
Introduction
Automatic sprinkler systems are a widely used type of fixed fire protection facility, consisting of sprinkler heads, alarm valve assemblies, and water flow alarm devices (water flow indicators).
It consists of components such as pressure switches (or pressure switches), as well as pipes, valves, and water supply facilities, and can automatically spray water to extinguish fires in the event of a fire. Each component...
Components in a system are interconnected and play specific roles, while also possessing independent specific functions.
GB 5135 "Automatic Sprinkler Systems" classifies automatic sprinkler systems according to the functions of their components, covering sprinkler heads, alarms, etc.
The system comprises valve assemblies, water flow alarm devices, and other components, as well as related products such as pipes and valves, forming a relatively complete standard system aimed at providing a framework for related production.
GB 5135 serves as a basis for design, production, inspection, certification, and acceptance by manufacturing enterprises, engineering construction units, relevant industry units, and departments.
It consists of 21 parts.
---Part 1.Sprinkler Heads. The purpose is to define the classification of standard coverage sprinkler heads and extended coverage sprinkler heads.
The specifications, including model designation, requirements, test methods, and inspection rules, ensure that the product starts automatically within the predetermined temperature range, in accordance with the design specifications.
The spray pattern and water volume are measured.
---Part 2.Wet Alarm Valves, Retarder, and Hydraulic Alarm Bells. The purpose is to specify the wet alarm valves and their associated retarder and hydraulic alarm bell.
The requirements, test methods, and inspection rules for the alarm bell are specified to ensure that the product functions as an alarm and control device in a wet system.
---Part 3.Water Mist Nozzles. The purpose is to specify the classification, model designation, requirements, test methods, and inspection rules for water mist nozzles.
The content ensures that the product is sprayed in the designed spray pattern to achieve an atomization effect and realize the purpose of spray fire extinguishing or protective cooling.
---Part 4.Dry-type alarm valves and accelerators. The purpose is to specify the requirements and test methods for dry-type alarm valves and their associated accelerators.
The regulations and inspection rules ensure that the product functions as a start-up and alarm in a dry system.
---Part 5.Deluge Alarm Valves. The purpose is to specify the classification, requirements, test methods, and inspection rules for deluge alarm valves.
This ensures that the product functions as a start-up and alarm in the rain shower system.
---Part 6.General Valves. The purpose is to specify the fire-fighting gate valves, fire-fighting ball valves, fire-fighting solenoid valves, and fire-fighting valves for automatic sprinkler systems.
The specifications cover requirements, test methods, and inspection rules for gate valves, fire signal valves, fire check valves, and underground fire gate valves.
Product quality.
---Part 7.Water Flow Indicators. The purpose is to specify the classification, requirements, and testing procedures for blade-type water flow indicators in automatic sprinkler systems.
The test methods and inspection rules ensure the product's ability to output signals as it flows through the water in a wet system.
---Part 9.Early Suppression Fast Response (ESFR) Sprinklers. The purpose is to specify the requirements for early suppression fast response (ESFR) sprinklers in automatic sprinkler systems.
According to the classification, requirements, test methods, and inspection rules of (ESFR) sprinkler heads, ensure that the product can be activated promptly in the early stages of a fire.
Spray water according to the designed sprinkler pattern and density to extinguish or suppress fires in warehouses and similar locations.
---Part 10.Pressure Switches. The purpose is to specify the components of pressure switches used in conjunction with alarm valves in automatic sprinkler systems.
The specifications, requirements, test methods, and inspection rules are designed to ensure the pressure alarm signal output capability of the alarm valve after activation.
---Part 11.Grooved Pipe Fittings. The purpose is to specify the classification of grooved pipe fittings and joints for automatic sprinkler systems.
The specifications include categories, requirements, test methods, and inspection rules, ensuring a reliable connection between the product and the system's water supply pipeline.
---Part 13.Water Curtain Sprinklers. The purpose is to specify the classification, model designation, requirements, and testing procedures for water curtain sprinklers in automatic sprinkler systems.
The testing methods and inspection rules ensure that the product sprays water curtains according to the spray pattern to achieve the purpose of heat insulation, cooling and protection.
---Part 14.Pre-action Devices. The purpose is to specify the requirements, test methods, and inspection rules for pre-action devices to ensure...
The product plays a role in monitoring, starting, and alarming in pre-action systems.
---Part 15.Household Shower Heads. The purpose is to specify the classification, requirements, test methods, and inspection rules for household shower heads, ensuring...
The certified products can quickly respond and activate in residential and living spaces, spraying water according to the designed sprinkler pattern and volume to control and extinguish fires.
---Part 16.Fire Sprinkler Hose. The purpose is to specify the fire sprinkler hoses that connect to the sprinkler heads at the end of an automatic sprinkler system.
The classification, requirements, test methods, and inspection rules of the pipes are explained to ensure the reliable and convenient connection of the products to sprinkler heads and water supply pipes.
connect.
---Part 17.Pressure Reducing Valves. The purpose is to define the classification and requirements of direct-acting and pilot-operated pressure reducing valves in automatic sprinkler systems.
Requirements, test methods, and inspection rules, etc., to ensure that the outlet pressure is reduced to a certain level when the inlet pressure and flow rate change.
Export pressure.
---Part 18.Fire Pipe Supports and Hangers. The purpose is to specify the classification and requirements of fire pipe supports and hangers for automatic sprinkler systems.
Requirements, test methods, and inspection rules, etc., to ensure that the product provides firm support for fire protection pipelines.
---Part 19.Plastic Pipes and Fittings. The purpose is to specify the types of chlorinated polyvinyl chloride (PVC) used in automatic sprinkler systems.
C) Requirements, test methods, and inspection rules for plastic pipes and fittings, ensuring that the products meet the standards for light hazard and medium hazard level I.
Safe and effective application in wet systems in various locations.
---Part 20.Coated Steel Pipes. The purpose is to specify the internal coating for automatic sprinkler systems with a nominal diameter not exceeding 300 mm.
This document covers the classification, requirements, test methods, and inspection rules for epoxy resin-coated steel pipes, aiming to improve the corrosion resistance of fire protection pipelines.
This ability extends its service life.
---Part 21.End-of-line testing apparatus. The purpose is to specify the classification, requirements, test methods, and inspection rules for end-of-line testing apparatus.
The content ensures that the product can effectively monitor the pressure at the end of the system and verify the system's start-up, alarm, and linkage functions.
---Part 22.Sprinklers for Special Applications. The purpose is to specify the classification, requirements, and testing of sprinklers for special applications in automatic sprinkler systems.
The methods and inspection rules, etc., ensure that the product can be activated promptly in the event of a fire in a high-ceilinged area of a civil building or warehouse, and control [the fire].
Control and extinguish fires.
---Part 23.Sprinkler Heads for Glass Partitions. The purpose is to specify the types of sprinkler heads for glass partitions in automatic sprinkler systems.
The document outlines the product's class, model designation, requirements, test methods, and inspection rules to ensure that the product automatically starts within the predetermined temperature range.
The designed spray pattern and flow rate evenly spray the glazed components of the building for cooling and protection.
Automatic sprinkler system
Part 21.End-of-line test equipment
1 Scope
This document defines the terminology and definitions for end-of-line test devices in automatic sprinkler systems, and specifies the classification and models of end-of-line test devices.
It outlines the requirements for preparation, inspection rules, marking, instructions for use, packaging, transportation, and storage, and describes the corresponding test methods.
This document applies to the design, production, and inspection of end-point test devices in automatic sprinkler fire extinguishing systems.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 191 Pictorial Symbols for Packaging and Storage
GB 5135.11 Automatic sprinkler systems - Part 11.Grooved pipe fittings
GB/T 7306 (all parts) 55° Sealing Pipe Thread
GB/T 9124.1 Steel pipe flanges - Part 1.PN series
GB/T 17241.1 Cast iron flanges - Part 1.PN series
XF61-2010 General Technical Specifications for Drive and Control Devices of Fixed Fire Extinguishing Systems
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
end-of-line test device inspector's test connection
Composed of a test valve, pressure display equipment (device), and test nozzles, it is used to monitor the terminal pressure of an automatic sprinkler fire extinguishing system and to verify...
A combination of system startup, alarm, and linkage functions.
3.2
Smart Inspector's Test Connection
Equipped with a digital communication port, it can digitally transmit signals such as pressure parameters and valve status, and can realize remote electric opening and closing, and automatic fault diagnosis.
End-of-line testing device with inspection and other functions.
3.3
test valve
The valves of the end-point test device can be opened and closed manually or electrically.
3.4
test nozzle
Located at the rear of the device, it has the same water flow coefficient as the smallest sprinkler head of the automatic sprinkler system on the same floor or in the fire compartment.
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