GB5135.21-2025
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 5135.21-2025 is an upcoming 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 Nov 1, 2026.
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 the design, production, and inspection of inspector's test connections (末端试水装置) used within automatic sprinkler systems. It covers various configurations, including manual, electric, and smart inspector's test connections equipped with digital communication capabilities. It is mandatory for manufacturers producing fire protection components for the Chinese market. The document does not apply to standalone fire valves or sprinklers without test connection assemblies.
Technical requirements
The standard specifies comprehensive technical requirements for inspector's test connections, focusing on structural integrity, material durability, and operational safety. Manufacturers must ensure that all wetted components utilize corrosion-resistant materials, such as brass or austenitic stainless steel. The devices must feature clear operational status indicators and pressure display equipment with an accuracy grade of at least 1.6. For smart inspector's test connections, the standard mandates the inclusion of a digital display screen showing pressure and valve status, alongside remote electric operation and fault self-diagnosis capabilities. These smart devices must reliably transmit pressure parameters, valve status, and address codes via digital communication ports. Additionally, the standard sets strict performance criteria for electrical components, including insulation resistance, contact resistance, and voltage endurance. New to this revision are the environmental adaptability and electromagnetic compatibility (EMC) requirements, ensuring devices operate reliably under varying temperatures, humidity, and electromagnetic interference.
Testing methods
The standard outlines a rigorous testing protocol to validate compliance. Key evaluations include the flow coefficient test, which measures discharge rates across varying pressures, and the strength and sealing tests, which verify structural integrity under 1.5x and 1.1x the rated working pressure, respectively. Devices must undergo a 1000-cycle operational reliability test to ensure long-term mechanical and electrical stability. For electric and smart models, the standard mandates salt spray corrosion tests, voltage endurance tests, and EMC testing (referencing XF 61-2010). Environmental adaptability is verified through sustained exposure to low temperatures, high temperatures, and constant damp heat, ensuring the device maintains a normal monitoring state without fault.
FAQs
What products are regulated under GB 5135.21-2025?
The standard regulates inspector's test connections (末端试水装置) used in automatic sprinkler systems. It covers various types including manual, electric, and smart inspector's test connections equipped with digital communication capabilities.
Are there any major updates in GB 5135.21-2025 compared to the previous version?
Yes, compared to the 2011 version, this revision introduces new requirements for environmental adaptability (temperature and humidity resistance) and electromagnetic compatibility (EMC) for smart and electrically operated models. It also updates requirements for appearance, rated working pressure, materials, and functional reliability.
How does GB 5135.21-2025 differ from international ISO standards for fire protection systems?
The standard specifies unique classifications and model designations (e.g., ZSPM) tailored to the Chinese market. It also introduces specific requirements for smart inspector's test connections, including digital communication ports and remote control capabilities, which may differ from general ISO guidelines. Manufacturers must ensure their product labeling and communication protocols align with these local specifications.
The summary above provides a high-level overview of GB 5135.21-2025. 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 5135.21-2025 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
Replaces:GB 5135.21-2011 (Current)