GB5135.21-2011
Automatic sprinkler system - Part 21: Inspector’s test connection
自动喷水灭火系统 第21部分：末端试水装置
GB 5135.21-2011 is a current mandatory Chinese national standard for Automatic sprinkler system - Part 21: Inspector’s test connection. It appears in the Environment compliance cluster with a product safety focus and has an implementation date of Jun 1, 2012.
Applicability depends on product scope, certification route, competent authority notices and transition rules. Requst for the translation or verify source before using this record in a compliance decision.
Compliance overview
Scope and applicability
This standard applies to inspector's test connections used in automatic sprinkler systems. It covers the terminology, classification, requirements, and testing methods for these specific fire protection devices. This standard is mandatory for manufacturers producing end-of-line test equipment for the Chinese market. It references related standards such as GB/T 191 and GB 5135.11 for packaging and coupling requirements.
Technical requirements
The standard specifies the structural and material requirements for inspector's test connections. Key components, including the test valve and test nozzle, must be made of metal materials with corrosion resistance not lower than brass. The rated working pressure of the device shall not exceed 1.2 MPa, and the protective cover must be red. It outlines strict performance criteria for flow coefficient deviation, strength, and sealing performance. The device must withstand specific pressure multipliers without leakage, deformation, or damage. Manufacturers must ensure the device can operate reliably for at least 1000 cycles without failure or leakage after closing. For electrically operated or signal-feedback models, the standard mandates specific requirements for overload capacity, voltage resistance, and insulation resistance. These electrical components must withstand voltage fluctuations and humid environments, ensuring safe operation under defined electrical stress.
Testing methods
The standard details comprehensive testing procedures including flow coefficient measurement, strength and sealing tests, and functional and reliability testing (1000 open/close cycles). It also includes a salt spray corrosion resistance test for the nozzle. Electrical variants undergo additional tests for overloading, voltage endurance, and insulation resistance, with pressure gauge performance verified according to GB/T 1226.
FAQs
What products are regulated under GB 5135.21-2011?
It regulates inspector's test connections (末端试水装置) used in automatic sprinkler systems, which are used to monitor terminal pressure and test system startup, alarm, and linkage functions.
Are there mandatory sections in this standard?
Yes, Chapter 6, Chapter 8, and Section 9.1 are mandatory, while the remaining sections are recommended.
What are the material requirements for the test valve and nozzle?
The test valve and test nozzle must be manufactured using metal materials with a corrosion resistance performance not lower than that of brass.
The summary above provides a high-level overview of GB 5135.21-2011. To ensure complete compliance for your products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 5135.21-2011 today to access all detailed parameters, tables, and testing procedures.
Applicability hints
- Type
- Product
- CCS
- C84
- ICS
- 13.220.10
- Competent department
- National Fire and Rescue Administration
- Technical committee
- National Technical Committee on Fire Protection of Standardization Administration of China
Relationships
Replaced by:GB 5135.21-2025 (Upcoming)