GB21976.2-2012
Escape apparatus for building fire - Part 2: Automatic and repetitive rescue controlled descent device
建筑火灾逃生避难器材 第2部分：逃生缓降器
GB 21976.2-2012 is a current mandatory Chinese national standard for Escape apparatus for building fire - Part 2: Automatic and repetitive rescue controlled descent device. It appears in the Construction compliance cluster with a product safety focus and has an implementation date of Jun 1, 2013.
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 automatic and repetitive rescue controlled descent devices (escape descenders) composed of a speed governor, rope, safety belt, safety hook, metal connectors, and rope reel. It is specifically designed for devices that rely on the user's weight for safe descent and can be used repeatedly. This standard is mandatory for all manufacturers producing these fire escape devices in China. It does not cover other types of escape apparatus such as escape ladders or slides, which are regulated under different parts of the GB 21976 series.
Technical requirements
The standard specifies comprehensive technical requirements for the physical and mechanical integrity of the descent device. It mandates strict criteria for appearance quality, ensuring no deformation or corrosion on metal parts. The standard details material specifications for critical components, requiring steel wire ropes to meet YB/T 5197 standards and safety belts to be made of cotton or synthetic fibers with specific dimensional tolerances. Regarding mechanical performance, the standard outlines strength requirements for the entire unit, safety belts, metal connectors, safety hooks, and ropes. These components must withstand significant tensile loads without breaking or deforming. Furthermore, it regulates the descent speed under various loads (minimum, standard, and maximum), ensuring a controlled and safe descent velocity. The descent speed must remain consistent even after the rope is soaked in water or exposed to extreme temperatures. The standard also sets benchmarks for drop resistance, impact resistance, and reliability. Devices must endure repeated drops and impacts without functional degradation. Additionally, it includes corrosion resistance requirements, mandating that metal parts withstand salt spray exposure without significant corrosion, followed by a functional descent test.
Testing methods
Testing procedures include visual inspection and dimensional measurements for structural integrity. Strength tests are conducted using a tensile testing machine to apply specified loads to the整机 (whole unit), safety belts, hooks, and ropes. Descent speed tests are performed under different loads, as well as after environmental conditioning such as water soaking, low-temperature (-30°C), and high-temperature (50°C) treatments. Drop and impact tests evaluate the device's durability against physical shocks. Reliability testing involves repeated descent cycles under maximum load. Finally, a salt spray test is used to assess the corrosion resistance of metal components over multiple cycles.
FAQs
What products are regulated under GB 21976.2-2012?
GB 21976.2-2012 regulates automatic and repetitive rescue controlled descent devices used for building fire escapes. These devices consist of a speed governor, rope, safety belt, safety hook, metal connectors, and rope reel, relying on the user's weight for descent.
Are there any mandatory chapters in GB 21976.2-2012?
Yes, Chapters 4, 6, and 7.1 are mandatory, while the remaining chapters are recommended. This means the technical requirements, inspection rules, and marking specifications must be strictly followed for compliance.
What are the environmental testing conditions for the descent speed?
The standard requires descent speed testing after the device has been subjected to various environmental conditions, including water soaking, low-temperature treatment at -30°C±2°C, and high-temperature treatment at 50°C±2°C. The descent speed must remain within the specified range of 0.16 m/s to 1.5 m/s after these treatments.
The summary above provides a high-level overview of GB 21976.2-2012. 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 21976.2-2012 today to access all detailed parameters, tables, and testing procedures.
Applicability hints
- Type
- Product
- CCS
- C85
- ICS
- 13.220.10
- Competent department
- National Fire and Rescue Administration
- Technical committee
- National Technical Committee on Fire Protection of Standardization Administration of China