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GB4452-2011
Outdoor fire hydrant
室外消火栓
GB 4452-2011 — действующий обязательный национальный стандарт Китая: Outdoor fire hydrant. Отрасль: Экология. Тема: Безопасность продукции. Дата вступления в силу: 1 июн. 2012 г..
Применимость зависит от продукции, схемы сертификации, уведомлений компетентных органов и переходных правил. Закажите перевод или проверьте источник, прежде чем использовать эту запись в решениях по соответствию.
Обзор требований
Этот обзор пока доступен только на английском языке.
Область применения
This standard applies to various outdoor fire hydrants and their accessories used in fire water supply pipelines. It covers different configurations including above-ground, underground, and folding types, as well as special variants such as foam, crashworthy, and pressure-reducing models. It is essential for manufacturers and suppliers of fire protection equipment entering the Chinese market.
Технические требования
The standard specifies comprehensive design and performance criteria for outdoor fire hydrants. Chapters 5, 7, and 8 are legally mandatory, dictating strict compliance for structural integrity, material selection, and operational reliability. The structure must ensure the minimum internal flow area is not less than 85% of the nominal diameter area. Material requirements mandate the use of specific metals such as grey cast iron for the main body and cast copper alloys for valve seats, ensuring long-term durability. The standard also defines strict parameters for appearance quality, thread dimensions, and opening heights to guarantee interoperability with standard fire-fighting equipment. Performance requirements include sealing performance under nominal pressure and hydraulic strength at 1.5 times the nominal pressure without leakage or damage. Specialized hydrants have unique criteria; for instance, crashworthy types must only fracture at designated parts upon impact, while folding hydrants must deploy within 30 seconds. Additionally, the standard regulates automatic residual water discharge devices to prevent freezing damage.
Методы испытаний
The standard outlines rigorous testing procedures to verify compliance. Key tests include hydraulic strength testing at 1.5 times nominal pressure, sealing performance tests under various operational states, and specific impact resistance evaluations for crashworthy models. It also details procedures for measuring opening height, verifying thread dimensions, and testing the deployment time of folding hydrants. Manufacturers must conduct both type tests and batch-by-batch inspections as defined in the inspection rules.
Частые вопросы
What products are regulated under GB 4452-2011?
This standard regulates various types of outdoor fire hydrants used in fire water supply pipelines, including above-ground, underground, folding, and special types such as foam, crashworthy, and pressure-reducing models.
Are there any updates from the previous version of GB 4452-2011?
The 2011 version replaces the older GB 4452-1996 and GB 4453-1984. Key updates include the addition of terminology, structural requirements, and new product categories like anti-collision and folding fire hydrants. Manufacturers previously certified under the 1996 version must transition to the new requirements.
How does GB 4452-2011 differ from international fire hydrant standards?
While the standard references general international principles, it specifically aligns material and thread requirements with Chinese national standards (e.g., GB/T 9439 for cast iron and GB/T 7307 for pipe threads). Overseas manufacturers must ensure their materials and interfaces match these specific GB references rather than just ISO equivalents.
The summary above provides a high-level overview of GB 4452-2011. 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 4452-2011 today to access all detailed parameters, tables, and testing procedures.
Подсказки по применимости
- Тип
- Продукция
- CCS
- C84
- ICS
- 13.220.10
- Компетентное ведомство
- National Fire and Rescue Administration
- Технический комитет
- National Technical Committee on Fire Protection of Standardization Administration of China