GB5135.11-2025
Automatic sprinkler systems—Part 11: Grooved pipe couplings and fittings
自动喷水灭火系统 第11部分：沟槽式管接件
GB 5135.11-2025 is an upcoming mandatory Chinese national standard for Automatic sprinkler systems—Part 11: Grooved pipe couplings and fittings. 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 grooved pipe couplings and fittings used in automatic sprinkler systems. It covers various components including rigid and flexible couplings, elbows, tees, crosses, reducers, and mechanical branch fittings. It is mandatory for manufacturers supplying fire protection piping components to the Chinese market.
Technical requirements
The standard specifies comprehensive physical and mechanical requirements for grooved pipe couplings. It mandates specific criteria for appearance, marking, and key product parameters such as rated working pressure, nominal diameter, and groove dimensions. Manufacturers must ensure strict adherence to dimensional tolerances and material specifications. Material integrity is heavily emphasized, requiring shell materials (such as ductile iron, cast steel, or stainless steel) to meet a minimum tensile strength of 450 MPa. Fasteners like bolts and nuts must meet specific mechanical property classes and undergo anti-corrosion treatments. Additionally, rubber sealing rings must satisfy stringent physical performance metrics, including tensile strength, elongation at break, and aging resistance, depending on the polymer used (e.g., EPDM, NBR, Silicone). Performance under extreme and operational conditions is rigorously defined. The components must demonstrate reliable sealing performance under vacuum and pneumatic pressure, as well as hydrostatic strength at 4 times the rated working pressure. Products must also withstand specific torque loads, low-temperature exposure, high-temperature aging, water shock cycles, and vibration without leakage or structural failure.
Testing methods
The standard outlines various testing procedures to verify compliance, including hydrostatic pressure tests for sealing and strength, and pneumatic and vacuum tests for leak verification. It also details methods for evaluating the bearing torque of fittings, measuring the deflection angle of flexible couplings, and assessing elongation gaps. Furthermore, it includes procedures for environmental and endurance testing such as low-temperature, high-temperature aging, water shock cycling, vibration, and fire resistance tests, along with a specialized test for determining the equivalent length of mechanical side branch fittings.
FAQs
What products are regulated under GB 5135.11-2025?
The standard regulates grooved pipe couplings and fittings, including rigid and flexible couplings, elbows, tees, crosses, and mechanical branch fittings, used in automatic sprinkler systems.
Are there any updates from the previous version of GB 5135.11?
The 2025 version replaces GB 5135.11-2006. Key updates include revised requirements for appearance, nominal diameters, shell materials, and bearing torque. It also introduces new requirements for characteristic parameters, flange/thread dimensions, and the equivalent length of mechanical side branch fittings.
How does GB 5135.11-2025 differ from ISO standards?
While the standard establishes comprehensive performance and testing criteria specific to the Chinese market, it references methodologies from international equivalents like ISO standards for material tensile testing and rubber aging evaluations.
The summary above provides a high-level overview of GB 5135.11-2025. 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 5135.11-2025 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 5135.11-2006 (Current)