AS/NZS 60079.20.1:2012

Abstract

Provide guidance on classification of gases and vapours.

Scope

This part of IEC 60079 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- or vapour-air mixtures under normal conditions of temperature1 and pressure so as to
permit the selection of an appropriate group of equipment. The method does not take into account the possible effects of obstacles on the safe gaps2. This standard describes also a test method intended for use in the determination of the auto-ignition temperature of a chemically pure vapour or gas in air at atmospheric pressure.
The tabulated values of chemical and engineering properties of substances are provided to assist engineers in their selection of equipment to be used in hazardous areas. It is hoped to publish further data from time to time, as the results of tests made in several countries become available.
The scope of these data has been selected with particular reference to the use of equipment
in hazardous areas, and notice has been taken of standard measurement methods.
NOTE 1 The data in this standard have been taken from a number of references which are given in the bibliography.
NOTE 2 Some variations in the data may appear when references are compared, but usually the discrepancy is sufficiently small to be of no importance in the selection of equipment.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Standards Australia
Pages
ISBN
Committee	MS-011
Supersedes	DR AS/NZS 60079.20.1 CP AS/NZS 60079.1.1:2002 AS/NZS 60079.20:2000 AS/NZS 60079.4:2000 AS/NZS 60079.12:2000