GB25972-2024
Gas fire extinguishing systems and components
气体灭火系统及部件
GB 25972-2024 is a current mandatory Chinese national standard for Gas fire extinguishing systems and components. It appears in the Environment compliance cluster with a product safety focus and has an implementation date of Dec 1, 2025.
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 inspection of gas fire extinguishing systems utilizing chemical synthetic agents like HFC227ea and inert gas agents such as IG-01, IG-100, IG-55, and IG-541. It does not apply to halon fire extinguishing systems, high and low-pressure carbon dioxide systems, or suspended and cabinet-type gas fire extinguishing devices. Manufacturers of these specified gas systems must ensure full compliance with this standard.
Technical requirements
The standard specifies the fundamental parameters for gas fire extinguishing systems, including working temperature ranges, discharge times, and working pressures for various system types. It details the composition requirements for internal stored pressure, external stored pressure, and self-pressurized systems. Systems must incorporate appropriate components to ensure reliable operation under specified conditions. It outlines the technical requirements for critical components such as container assemblies, nozzles, selector valves, check valves, and pressure relief devices. The standard also introduces requirements for Status Sensor Units (SSU) and Data Transfer Units (DTU) to enable real-time monitoring and data transmission of system status, referencing software quality requirements from GB/T 25000.51. Additionally, the standard covers the requirements for pressure relief devices in protected areas, including their action pressure, effective relief area, and fire resistance. It also specifies performance criteria for seismic supports and hangers, ensuring structural integrity during earthquakes. All components must meet stringent material and corrosion resistance specifications.
Testing methods
The standard details comprehensive testing methodologies to verify compliance, including hydraulic strength tests, gas tightness tests, and various corrosion resistance tests (salt spray, stress corrosion, sulfur dioxide). It also specifies procedures for evaluating the reliability of valves, the flow characteristics of nozzles, and the discharge performance of the entire system. Furthermore, it includes specific tests for electrical components like dielectric voltage withstand and insulation resistance, as well as environmental tests for temperature cycling and vibration. Each component must undergo rigorous testing according to the defined procedures.
FAQs
What products are regulated under GB 25972-2024?
It regulates gas fire extinguishing systems and their components, specifically those using HFC227ea and inert gases like IG-541.
Are there any updates from the previous version of GB 25972?
Yes, the 2024 version introduces requirements for external stored pressure systems, Status Sensor Units (SSU), Data Transfer Units (DTU), and pressure relief devices in protected areas.
Does GB 25972-2024 apply to CO2 fire extinguishing systems?
No, it explicitly excludes high and low-pressure carbon dioxide fire extinguishing systems.
The summary above provides a high-level overview of GB 25972-2024. 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 25972-2024 today to access all detailed parameters, tables, and testing procedures.
Applicability hints
- Type
- Product
- CCS
- C 83
- 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 25972-2010