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 は施行予定の中国強制国家規格です：Automatic sprinkler systems—Part 11: Grooved pipe couplings and fittings。業界：環境。テーマ：製品安全。施行日：2026年11月1日。

適用可否は製品範囲、認証ルート、所管当局の通知、移行規定によって異なります。コンプライアンス判断に使う前に、翻訳をご依頼いただくか公式情報源をご確認ください。

コンプライアンス概要

この概要は現在英語のみで提供しています。

適用範囲

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.

技術要求

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.

試験方法

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.

よくある質問

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.

適用のヒント

種別: 製品
CCS: C84
ICS: 13.220.10
所管部門: National Fire and Rescue Administration
技術委員会: National Technical Committee on Fire Protection of Standardization Administration of China