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 is a current mandatory Chinese national standard for Automatic sprinkler system--Part 3: Water mist nozzles. It appears in the Construction compliance cluster with a product safety focus and has an implementation date of May 1, 2004.
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 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.
Technical requirements
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.
Testing methods
- 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.
FAQs
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.
Applicability hints
- Type
- Product
- CCS
- C83
- ICS
- 13.220.20
- Competent department
- National Fire and Rescue Administration
- Technical committee
- National Technical Committee on Fire Protection of Standardization Administration of China
Relationships
Replaced by:GB 5135.3-2025 (Upcoming)