GB 3836.11-2008 Explosive atmospheres - Part 11: Equipment protection by flameproof enclosures d - Method of test for ascertainment of maximum experimental safe gap
This Part of GB 3836 describes a test method intended for the measurement of the maximum experimental safe gaps for gas- or vapour-air mixtures under normal conditions of temperature 1) and pressure so as to permit the selection of an appropriate group of flameproof enclosures.
The method does not take into account the possible effects of obstacles on the safe gaps 2).
2 Terms and Definitions
For the purpose of this Part of GB 3836, the following definitions apply.
2.1 Maximum experimental safe gap (MESG)
Maximum gap between the two parts of the interior chamber which, under the test conditions specified below, prevents ignition of the external gas mixture through a 25 mm long flame path when the internal mixture is ignited, for all concentrations of the tested gas or vapour in air
3 Outline of Method
