GB5135.3-2003

Automatic sprinkler system--Part 3: Water mist nozzles

自动喷水灭火系统第3部分: 水雾喷头

GB 5135.3-2003 é uma norma nacional chinesa obrigatória vigente: Automatic sprinkler system--Part 3: Water mist nozzles. Setor: Construção. Foco: Segurança de produtos. Entrada em vigor: 1 de mai. de 2004.

A aplicabilidade depende do escopo do produto, da via de certificação, dos avisos da autoridade competente e das regras de transição. Solicite uma tradução ou verifique a fonte antes de usar este registro em uma decisão de conformidade.

Visão geral de conformidade

Esta visão geral está disponível por enquanto apenas em inglês.

Escopo e aplicabilidade

This standard specifies the requirements, test methods, inspection rules, and marking for water mist nozzles used in automatic sprinkler systems. It is applicable to various types of water mist nozzles, including open and closed types, utilized in fire protection systems. Manufacturers of fire suppression components must ensure their products comply with this standard to enter the Chinese market. It references GB 5135.1-2003 for specific requirements related to closed-type nozzles.

Requisitos técnicos

The standard outlines comprehensive performance criteria for water mist nozzles, focusing on physical integrity, flow characteristics, and environmental durability. Key parameters include flow coefficient tolerances, spray angle accuracy, and water distribution performance. The nozzles must effectively atomize water, with specific limits on the characteristic droplet diameter, ensuring optimal fire suppression capabilities. Furthermore, the standard mandates rigorous durability and resistance testing. Nozzles must withstand ammonia stress corrosion, sulfur dioxide corrosion, and salt spray corrosion without significant degradation or flow variation. Compliance with these environmental resistance tests is mandatory for product certification. Mechanical robustness is also a core requirement. The nozzles are subjected to vibration resistance and mechanical impact resistance evaluations to ensure structural integrity during transportation and operation. Additionally, they must endure extreme temperature conditions, including low-temperature and high-temperature endurance tests. For closed water mist nozzles, additional criteria apply, aligning with the broader specifications in GB 5135.1-2003. These include thermal response characteristics, fatigue strength, and operational load requirements. Manufacturers must verify that both open and closed nozzles meet all applicable structural and functional thresholds.

Métodos de ensaio

- Flow Coefficient Measurement: Evaluates flow rate consistency across varying pressures. - Spray Angle Measurement: Determines the accuracy of the atomization cone angle. - Water Distribution Test: Assesses the uniformity of water density over a protected area. - Droplet Size Measurement: Uses laser instrumentation to measure the volume percentage characteristic diameter. - Corrosion Resistance Tests: Includes ammonia stress, sulfur dioxide, and salt spray exposures. - Environmental Endurance Tests: Covers low and high-temperature stability. - Mechanical Strength Tests: Vibration and mechanical impact evaluations.

Perguntas frequentes

What products are regulated under GB 5135.3-2003?

It regulates water mist nozzles used in automatic sprinkler systems, covering both open and closed types (A, B, and C categories).

Does GB 5135.3-2003 reference other standards?

Yes, it references GB/T 7306 for thread specifications and GB 5135.1-2003 for additional requirements applicable to closed water mist nozzles.

Are the technical requirements in this standard mandatory?

Yes, Chapter 5 (Requirements) and Chapter 7 (Inspection Rules) are mandatory, while the remaining chapters are recommended.

The summary above provides a high-level overview of GB 5135.3-2003. 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 5135.3-2003 today to access all detailed parameters, tables, and testing procedures.

Indicações de aplicabilidade

Tipo: Produto
CCS: C83
ICS: 13.220.20
Órgão competente: National Fire and Rescue Administration
Comitê técnico: National Technical Committee on Fire Protection of Standardization Administration of China

Relações

Substituída por:GB 5135.3-2025 (Futura)