GB/T 3836.35-2021: Explosive atmospheres - Part 35: Classification of areas for explosive dust atmospheres

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Scope

This document specifies the identification and classification of areas where explosive
dust atmospheres and possible combustible dust layers are present, so as to
appropriately assess the ignition sources appearing in these areas.
In this document, the explosive dust atmospheres and combustible dust layers are
differentially treated. Chapter 4 describes the classification of areas for explosive dust
clouds, and dust layer is considered as one of the possible release sources. 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 layers. If effective site cleaning is not carried out, the classification
of areas will include the explosive dust clouds that may be formed by the dust layers.
For areas where combustible fibers or combustible flyings may cause hazards, the
principle of this document may also be followed.
This document is applicable to areas where hazards may be caused 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 that are
higher or lower than the benchmark: 101.3 kPa and 20 °C, provided that these
changes have negligible impact on the explosive characteristics of combustible
materials.
This document does not apply to:
---underground mining areas;
---spontaneously combustible materials that do not require atmospheric oxygen
for combustion, 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 gas emitted with dust.
This document does not apply to areas that may be hazardous due to the presence of
combustible gases or vapors, but this principle may be used to assess hybrid mixtures
(see also GB 3836.14).
NOTE 2: see Appendix A for supplementary guidance on the hybrid mixtures.
This document does not consider the effects of damage following a fire or explosion.

Basic Data

Standard ID	GB/T 3836.35-2021 (GB/T3836.35-2021)
Description (Translated English)	Explosive atmospheres - Part 35: Classification of areas for explosive dust atmospheres
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	K35
Word Count Estimation	23,266
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration