GB16668-2025
General technical specifications for powder extinguishing system and components
干粉灭火系统及部件通用技术条件
GB 16668-2025 is an upcoming mandatory Chinese national standard for General technical specifications for powder extinguishing system and components. It appears in the Environment compliance cluster with a product safety focus and has an implementation date of Aug 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, manufacturing, and testing of fixed and semi-fixed powder extinguishing systems and their components, including cabinet-type powder extinguishing equipment. It covers systems utilizing BC, ABC, and D Class dry powder agents, driven by either stored pressure or expellant gas storage cylinders. Manufacturers of fire protection systems must verify that their product categories fall under these classifications to ensure compliance.
Technical requirements
The standard specifies comprehensive performance criteria for the powder extinguishing system and its integral components. It mandates structural requirements, such as having independent mechanical emergency, automatic, and manual startup modes, alongside specific working environment temperature and humidity limits. Systems must demonstrate reliable activation and effective discharge capabilities under varying environmental conditions. For individual components, the standard sets strict parameters for dry powder storage containers, container valves, check valves, selector valves, and nozzles. Requirements include material corrosion resistance, pressure resistance, and operational reliability. Each component must withstand specified hydraulic strength and overpressure tests without deformation or leakage. Additionally, safety protection devices like safety valves and pressure relief devices must have precise action pressure settings. A major focus is placed on extinguishing performance and agent discharge efficiency. The standard outlines maximum effective discharge times and maximum residual powder ratios to ensure optimal agent delivery. Systems must successfully extinguish A, B, and D class fires without re-ignition within specified suppression periods. It also introduces new requirements for D class fire performance, specifically targeting metal sodium, metal magnesium, and triethylaluminum fires. The standard details requirements for leak detection devices and drive control mechanisms. Pressure indicators and weighing devices must provide accurate monitoring and trigger alarms at specified loss thresholds. Electrical components like signal feedback devices must meet strict insulation and voltage resistance criteria to ensure system integrity during activation.
Testing methods
The standard outlines a rigorous suite of testing methods to validate component integrity and system performance. Key tests include hydraulic strength and overpressure tests for containers and valves, salt spray corrosion tests for metallic components, and temperature cycling leak tests for gas cylinder assemblies. System efficacy is verified through full-scale flooding and local application fire tests for Class A, B, and D fires. Additionally, it specifies procedures for evaluating nozzle powder distribution, impact resistance, and the operational reliability of valves through repeated cycling.
FAQs
What products are regulated under GB 16668-2025?
GB 16668-2025 applies to fixed and semi-fixed powder extinguishing systems, including cabinet-type powder extinguishing equipment, BC/ABC/D class systems, and their associated components like storage containers, valves, and nozzles.
Are there any key updates from the previous GB 16668-2010 version?
The 2025 version introduces new requirements for Class D powder extinguishing systems, pre-setting pressure actuating devices, and low-leakage high-seal valves. It also updates structural and extinguishing agent requirements while removing provisions for gas generators and thermal stability of plastic/rubber parts.
Does GB 16668-2025 reference other standards?
The standard references several national standards such as GB/T 150 for pressure vessels, GB 4066 for powder extinguishing agents, and XF 61 for drive control devices, ensuring comprehensive alignment with Chinese fire safety infrastructure.
The summary above provides a high-level overview of GB 16668-2025. 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 16668-2025 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 16668-2010 (Current)