GB3445-2018

Indoor fire hydrant

室内消火栓

GB 3445-2018 é uma norma nacional chinesa obrigatória vigente: Indoor fire hydrant. Setor: Construção. Foco: Segurança de produtos. Entrada em vigor: 1 de abr. de 2019.

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 applies to the manufacturing, testing, and certification of indoor fire hydrants used in building fire protection systems. It covers various structural types, including rotatable, pressure-reducing, and pressure-reducing and stabilizing indoor fire hydrants. It is mandatory for all manufacturers producing fire hydrants for the Chinese market.

Requisitos técnicos

The standard specifies comprehensive material and structural requirements for indoor fire hydrants. Key components such as the valve body, bonnet, and disc must be made of qualified gray cast iron or equivalent metals, while the valve stem requires specific lead brass or materials with comparable mechanical properties. Manufacturers must strictly adhere to these material gradations to ensure compliance. It defines critical operational parameters, including nominal diameter (DN 25, 50, 65) and a nominal pressure of 1.6 MPa. The standard sets specific limits for valve stem lifting performance, rotational torque, and opening height to ensure reliable operation during emergencies. Hydrants must operate smoothly without mechanical binding under specified pressure conditions. For specialized variants like pressure-reducing and stabilizing types, the standard mandates specific performance criteria regarding outlet pressure stability and flow rates. Additionally, all hydrants must meet stringent hydraulic strength and sealing performance requirements to prevent leakage and rupture under high pressure.

Métodos de ensaio

The standard outlines specific testing procedures to verify compliance. This includes visual inspection for surface defects, dimensional measurements using universal gauges, and material tensile testing according to GB/T 228.1. Hydrostatic strength and sealing tests are conducted under pressures up to 2.4 MPa and 1.6 MPa respectively. Furthermore, it details salt spray corrosion tests and operational torque measurements to ensure long-term reliability.

Perguntas frequentes

What products are regulated under GB 3445-2018?

It applies to various types of indoor fire hydrants, including rotatable, pressure-reducing, pressure-reducing and stabilizing, and reducing tee configurations, with nominal diameters of 25mm, 50mm, and 65mm.

Are there any major updates in GB 3445-2018 compared to the 2005 version?

The 2018 version introduces the definition and requirements for reducing tee indoor fire hydrants, modifies the tensile strength and pressure-reducing performance criteria, and adds material requirements for the rotating parts and handwheels of rotatable hydrants.

How does GB 3445-2018 differ from international ISO standards for fire hydrants?

While the fundamental testing principles are similar, GB 3445-2018 specifies exact parameter limits, material grades (such as specific HT200 gray cast iron), and marking rules tailored specifically for the Chinese fire protection market.

The summary above provides a high-level overview of GB 3445-2018. To ensure complete compliance for your fire protection 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 3445-2018 today to access all detailed parameter tables, material specifications, and testing procedures.

Indicações de aplicabilidade

Tipo: Produto
CCS: C84
ICS: 13.220.10
Órgão competente: National Fire and Rescue Administration
Comitê técnico: National Technical Committee on Fire Protection of Standardization Administration of China

Relações

Substitui:GB 3445-2005