GB5135.23-2026
Automatic sprinkler system—Part 23：Glass separation sprinklers
自动喷水灭火系统 第23部分：玻璃分隔用洒水喷头
GB 5135.23-2026 is an upcoming mandatory Chinese national standard for Automatic sprinkler system—Part 23：Glass separation sprinklers. It appears in the Environment compliance cluster with a product safety focus and has an implementation date of Aug 1, 2027.
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 glass separation sprinklers utilized in automatic sprinkler systems. It specifically regulates sprinklers intended to discharge water onto glazed building elements for cooling protection during a fire. This standard is not applicable to ESFR sprinklers, domestic sprinklers, special application sprinklers, or on-off sprinklers.
Technical requirements
The standard mandates strict physical and mechanical requirements for the sprinkler assembly. It specifies criteria for interface threads, sealing structures (explicitly prohibiting rubber seals), and hydrostatic sealing and strength performance. Manufacturers must ensure that sprinklers cannot be easily adjusted, disassembled, or reassembled. Additionally, it defines parameters for flow coefficients, water distribution uniformity, and static operating temperatures. Thermal sensitivity and durability are heavily regulated under this standard. It sets limits for the Response Time Index (RTI), requiring rapid response capabilities. The standard outlines rigorous demands for thermal stability, fatigue strength, and the mechanical strength of heat-sensitive elements (both glass bulbs and fusible links). Products must withstand severe environmental and mechanical stressors without functional degradation. A significant portion of the requirements focuses on environmental and corrosion resistance. Sprinklers must demonstrate reliability after exposure to vibration, mechanical impact, rolling, freezing, and high temperatures. Furthermore, the standard sets strict pass/fail criteria for resistance to various corrosive agents, including stress corrosion (ammonia and magnesium chloride), salt spray, sulfur dioxide, and humid gases. The standard establishes unique fire resistance performance criteria tailored for glass separation applications. It requires that the sprinkler continuously discharges water to cover the fire-facing surface of the glazed element, ensuring the assembly maintains its fire integrity and thermal insulation. The glazed element must meet specific fire resistance thresholds while being actively protected by the sprinkler.
Testing methods
The standard outlines a comprehensive suite of testing procedures to verify compliance. Key evaluations include hydrostatic strength tests, flow coefficient measurement, and water distribution tests using standardized tempered glass panels. Thermal performance is assessed via static action temperature tests in liquid baths and dynamic thermal tests in wind tunnels to determine the RTI. Strict environmental and mechanical tests, such as vibration, impact, rolling, and freeze tests, are mandated. Finally, a specialized fire resistance test is conducted using a furnace that follows an outdoor fire heating curve to evaluate the sprinkler's ability to protect the standard glazed element.
FAQs
What products are regulated under GB 5135.23-2026?
This standard regulates glass separation sprinklers used in automatic sprinkler systems to provide cooling protection for glazed elements. It does not apply to ESFR sprinklers, domestic sprinklers, special application sprinklers, or on-off sprinklers.
How does GB 5135.23-2026 classify glass separation sprinklers?
The standard classifies sprinklers by installation position (pendant and horizontal) and by thermal sensing element (fusible element and glass bulb). It introduces specific model designations and mandates strict performance criteria for cooling glazed building components.
Does GB 5135.23-2026 differ from general sprinkler standards?
While it shares foundational testing concepts with general sprinkler standards like GB 5135.1, this standard specifically mandates a unique fire resistance test using an outdoor fire curve to evaluate the sprinkler's ability to maintain the fire integrity and thermal insulation of glazed elements.
The summary above provides a high-level overview of GB 5135.23-2026. 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 5135.23-2026 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