GB/T 3836.35-2021
Explosive atmospheres—Part 35：Classification of areas for explosive dust atmospheres (English Version)

Standard No.

GB/T 3836.35-2021

Language

Chinese, Available in English version

Release Date

2021

Published By

国家市场监督管理总局、中国国家标准化管理委员会

Latest

GB/T 3836.35-2021

Replace

GB/T 12476.3-2017

Scope

This document specifies the identification and classification of places where explosive dust atmospheres and combustible dust layers may be present, in order to properly assess the ignition sources present in these places. In this document, the explosive dust atmosphere and the combustible dust layer are treated differently. Chapter 4 describes the classification of places for explosive dust clouds, with dust layers as one of the possible sources of release. Chapter 7 describes the ignition hazards of dust layers. This document adopts effective site cleaning based on factory cleaning to prevent the accumulation of dust layer. If effective site clean-up is not carried out, the site classification will include the possible formation of an explosive dust cloud by the dust layer. For places where flammable fibers or flammable flying catkins may cause danger, the principles of this document can also be followed. This document applies to locations where hazards may arise due to the presence of explosive dust atmospheres or combustible dust layers under normal atmospheric conditions (see Note 1). Note 1: Atmospheric conditions include pressure and temperature changes above or below the reference 101.3kPa and 20 ℃, provided that these changes have negligible impact on the explosive properties of combustible materials. This document does not apply to: --- Underground coal mine sites; --- Pyrophoric substances that do not require atmospheric oxygen to burn, such as pyrophoric substances, propellants, pyrotechnics, ammunition, peroxides, oxidants, water-reactive elements or compounds , or other similar materials; --- abnormal catastrophic accidents beyond the scope of this document; --- hazards caused by toxic gases ejected with dust. This document does not apply to places where there may be hazards due to the presence of flammable gases or vapors, but this principle can be used to assess hybrids (see also GB3836.14). Note 2: See Appendix A for additional guidance on hybrids. This document does not consider the effects of damage subsequent to fire or explosion.

GB/T 3836.35-2021 history

• 2021 GB/T 3836.35-2021 Explosive atmospheres—Part 35：Classification of areas for explosive dust atmospheres
• 2017 GB/T 12476.3-2017 Electrical apparatus for use in the presence of combustible dust—Part 3: Classification of areas where combustible dusts are or may be present
• 2007 GB 12476.3-2007 Electrical apparatus for use in the presence of combustible dust.Part 3: Classification of areas where combustible dusts are or may be present

GB/T 3836.35-2021 Explosive atmospheres—Part 35：Classification of areas for explosive dust atmospheres has been changed from GB/T 12476.3-2017 Electrical apparatus for use in the presence of combustible dust—Part 3: Classification of areas where combustible dusts are or may be present.

GB/T 3836.35-2021 -All Parts