GB12525-1990

Emission standards and measurement methods of railway noise on the boundary alongside railway line

铁路边界噪声限值及其测量方法

GB 12525-1990 é uma norma nacional chinesa obrigatória vigente: Emission standards and measurement methods of railway noise on the boundary alongside railway line. Setor: Meio ambiente. Foco: Métodos de ensaio. Entrada em vigor: 1 de mar. de 1991.

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 is specifically applicable to the evaluation of railway noise at the boundaries alongside railway lines within urban areas. It defines the railway boundary as a point exactly 30 meters away from the outer track's center line. This standard is mandatory for environmental noise compliance assessments related to railway operations.

Requisitos técnicos

The standard establishes the emission limits for railway noise expressed as equivalent continuous A-weighted sound pressure levels (Leq). It sets a uniform noise limit for both daytime and nighttime operations, though the exact designation of day and night periods is determined by local municipal authorities based on regional habits and seasonal changes. Furthermore, the standard outlines specific requirements for background noise correction. If the background noise level is less than 10 dB(A) lower than the measured railway noise, specific mathematical corrections must be applied to ensure the accuracy of the final reported railway noise level.

Métodos de ensaio

The measurement procedures require the use of Type II or higher integrating sound level meters compliant with GB 3785. Measurements are taken at a height of 1.2 meters above the ground, at least 1 meter away from any reflecting objects. The testing protocol requires capturing a 1-hour equivalent sound level during periods that represent the average traffic density of trains for both daytime and nighttime. Measurements must be conducted under specific meteorological conditions, explicitly avoiding rain or snow, and must be halted if the wind speed exceeds grade 4.

Perguntas frequentes

What is the scope of GB 12525-90?

The standard applies to the evaluation of railway noise at the boundaries of urban railway lines. The boundary is specifically defined as the location 30 meters away from the outer track's center line.

What is the noise limit specified in GB 12525-90?

The standard sets a noise limit of 70 dB(A) for both daytime and nighttime equivalent sound levels (Leq). The exact designation of daytime and nighttime hours is determined by local government authorities.

What instruments are required for measurement under GB 12525-90?

Measurements must be conducted using Type II or higher integrating sound level meters that comply with GB 3785. The measurement must represent a 1-hour equivalent sound level during average train traffic density, under specific weather conditions (no rain or snow, wind speed below grade 4).

The summary above provides a high-level overview of GB 12525-90. To ensure complete compliance for your railway projects or environmental assessments in the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 12525-90 today to access all detailed parameters, background correction tables, and official measurement procedures.

Indicações de aplicabilidade

Tipo: Proteção ambiental
CCS: Z67
ICS: 17.140.30
Órgão competente: Ministry of Ecology and Environment
Comitê técnico: Ministry of Ecology and Environment