NB/T 11634-2024Low noise structural design and noise limit requirements of auxiliary fan used for coal mine (English PDF)
煤矿用局部通风机低噪声结构设计与噪声限定要求
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Issued by
NEA
Level / Type
Industry · Recommended
Issue date
September 24, 2024
Implementation date
March 24, 2025
Scope
NB/T 11634-2024 is the English-translated version of 煤矿用局部通风机低噪声结构设计与噪声限定要求.
NB/T 11634-2024 addresses noise from local ventilation fans used in coal mines, covering both how to design the fan structure for low noise and the noise limits the fan must meet.
It also specifies how noise is measured and how noise values are calculated, using the A-weighted sound level, the fan casing, inlet and outlet as sound sources, and a standard measuring length set by impeller diameter.
Measurement follows GB/T 2888, while silencers and materials link to JB/T 6891, GB 8624 and the MT/T rules on flame retardancy and spark safety. Issued on 24 September 2024, it has applied since 24 March 2025.
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Document preview — NB/T 11634-2024
National Standard of the People's Republic of China
- ICS
- 73.100.01
- Classification
- D 98
Issued by: National Energy Administration of the People's Republic of China
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.
1 Scope
This document specifies the low-noise structural design requirements, noise limit requirements, noise measurement and noise value calculation for local ventilators used in coal mines.
This document applies to the low-noise structural design of local ventilators used in coal mines (hereinafter referred to as "ventilators").
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document. document.
GB/T 1236 Standardized air duct performance test for industrial ventilators
GB/T 2888 Methods of measuring noise of fans and Roots blowers
GB 8624-2012 Classification of combustion performance of building materials and products
GB/T 13813 Test methods and judgment rules for friction spark safety of metal materials used in coal mines
GB/T 17795 Glass wool products for building insulation
JB/T 6891 Technical Specifications for Mufflers for Fans
JB/T 9100 Technical Specifications for Local Ventilators in Mines
MT/T 113 General test methods and judgment rules for flame retardancy and antistatic properties of polymer products used in underground coal mines
MT/T 222 Technical requirements for local ventilation fans for coal mines
MT/T 500 Technical specifications for gas (liquid) driven local ventilators for coal mines
3 Terms and definitions
The terms and definitions defined in GB/T 2888, JB/T 6891 and the following apply to this document.
3.1 A sound level
The noise level measured by a sound level meter through an A-weighted network.
Note: The unit is decibel, symbol dB(A). [Source: GB/T 2888-2008, 3.1, modified]
3.2 Acoustic source
Noise sources generated by fan casing, air inlet, air outlet, etc. [Source: GB/T 2888-2008, 3.2, modified]
3.3 Standard length
The distance from the noise measurement point to the sound source point, when measuring the noise at the fan inlet and outlet, when the impeller nominal diameter is <=1 m, the standard length is 1 m;
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 1236Industrial fan -- Performance testing using standardized airways
- GB/T 2888Methods of noise measurement for fans blowers compressors and roots blowers
- GB 8624-2012Classification for burning behavior of building materials and products
- GB/T 13813Testing method and judging rule of safety to friction spark of metallic material for coal mine
- GB/T 17795Glass wool thermal insulating products for building
- JB/T 6891Silencers for fans - Technical requirements
MT/T 113 · MT/T 222 · MT/T 500
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Related Standards
GB 8624-2012 — Classification for burning behavior of building materials and products
GB/T 1236-2017 — Industrial fan -- Performance testing using standardized airways
GB/T 13813-2023 — Testing method and judging rule of safety to friction spark of metallic material for coal mine
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