1 Function and terms
1.0.1 Function
The flame arrester is made of a material which can pass through gas and has many tiny channels or gaps. The flame is divided into many fine flame flows by the flame arrester elements when it enters the flame arrester, and such flows are quenched due to the heat transfer effect (gas is cooled) and the wall effect.
1.0.2 Terms
1.0.2.1 Explosion and explosive mixed gas
The explosion refers to any phenomenon where stimulation by external forces, such as high heat, friction and impact, or other substances can cause drastic chemical changes in a very short period of time, resulting in a sharp rise in pressure, while loud noise is accompanied and a large amount of heat is released. The explosion in this specification refers to the explosion of combustible gas mixture which is called explosive mixed gas.
1.0.2.2 Deflagration
The combustion process in which the flame wave of explosive mixed gas propagates in the pipe at a speed lower than the sound speed is called deflagration.
1.0.2.3 Detonation
The combustion process in which the flame wave of explosive mixed gas propagates in the pipe at a speed higher than the sound speed is called detonation.
1.0.2.4 Maximum experimental safe gap (MESG)
It refers to the width of the slit (length: 25mm) which just prevents the flame from passing under the standard test conditions (1 bar; 20℃). The definition of MESG (MAXIMUM EXPERIMENTAL SAFE GAP) is internationally unified, and its data must be taken from a standard MESG test device.
1 Function and terms
2 Classification of flame arresters
3 Setting of flame arresters
4 Selection of flame arresters
5 Precautions for installation of flame arresters
6 Maintenance and freeze protection of flame arresters
7 Data sheet and summary list
Standard
HG/T 20570.19-1995 Setting of Flame Arresters (English Version)
1 Function and terms
1.0.1 Function
The flame arrester is made of a material which can pass through gas and has many tiny channels or gaps. The flame is divided into many fine flame flows by the flame arrester elements when it enters the flame arrester, and such flows are quenched due to the heat transfer effect (gas is cooled) and the wall effect.
1.0.2 Terms
1.0.2.1 Explosion and explosive mixed gas
The explosion refers to any phenomenon where stimulation by external forces, such as high heat, friction and impact, or other substances can cause drastic chemical changes in a very short period of time, resulting in a sharp rise in pressure, while loud noise is accompanied and a large amount of heat is released. The explosion in this specification refers to the explosion of combustible gas mixture which is called explosive mixed gas.
1.0.2.2 Deflagration
The combustion process in which the flame wave of explosive mixed gas propagates in the pipe at a speed lower than the sound speed is called deflagration.
1.0.2.3 Detonation
The combustion process in which the flame wave of explosive mixed gas propagates in the pipe at a speed higher than the sound speed is called detonation.
1.0.2.4 Maximum experimental safe gap (MESG)
It refers to the width of the slit (length: 25mm) which just prevents the flame from passing under the standard test conditions (1 bar; 20℃). The definition of MESG (MAXIMUM EXPERIMENTAL SAFE GAP) is internationally unified, and its data must be taken from a standard MESG test device.
Contents of HG/T 20570.19-1995
1 Function and terms
2 Classification of flame arresters
3 Setting of flame arresters
4 Selection of flame arresters
5 Precautions for installation of flame arresters
6 Maintenance and freeze protection of flame arresters
7 Data sheet and summary list
