M00020289
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ISO/IEC DIS 80079-20-1 2015 Edition, December 4, 2015 EXPLOSIVE ATMOSPHERES - PART 20-1: MATERIAL CHARACTERISTICS FOR GAS AND VAPOUR CLASSIFICATION - TEST METHODS AND DATA
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Availability date: 07/14/2021
Description / Abstract:
This part of ISO/IEC 80079 provides guidance on classification
of gases and vapours. It describes a test method intended for the
measurement of the maximum experimental safe gaps (MESG) for
gas-air mixtures or vapour-air mixtures under normal conditions of
temperature1 and pressure (20 °C, 100 kPa) so as to permit the
selection of an appropriate group of equipment. The standard
describes also a test method intended for use in the determination
of the auto-ignition temperature (AIT) of a vapour-air mixture or
gas-air mixture at atmospheric pressure, so as to permit the
selection of an appropriate temperature class of equipment.
Values of chemical properties of materials are provided to
assist in the selection of equipment to be used in hazardous areas.
Further data may be added as the results of validated tests become
available.
The materials and the characteristics included in a table (see
Annex B) have been selected with particular reference to the use of
equipment in hazardous areas. The data in this standard have been
taken from a number of references which are given in the
bibliography.
These methods for determining the MESG or the AIT may also be
used for gas-air-inert mixtures or vapour-air-inert mixtures.
However, data on air-inert mixtures are not tabulated.