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Combustion alarm standard gas
Combustible materials (flammable gases,vapors and dust) and air (or oxygen) must be at a certain concentration range of mixing to form a premixed gas,is confronted with fire before the explosion,the explosion limit concentration range is called,or explosive concentrations of limit.Flammable mixtures can explode the lowest concentration and highest concentration,are known as lower explosive limit (referred to as "LEL".English: Lower Explosion Limited) and upper explosive limit (referred to as "UEL".English: Upper Explosion Limited),both sometimes also known as fire and fire upper limit.Below the lower limit of the explosion nor fire or explosion;above the upper limit of the same non-flammable non-explosive blast.
Gas or steam explosion limit is based on a mixture of flammable substances in the percentage of share volume (%) to represent.Flammable mixture explosion limits wider,lower explosion limit,the lower explosion limit and the higher,the greater the risk of explosion.
Combustible gas concentrations in the air blast reached its lower limit,we call this place the gas environment can be an explosion risk 100 percent,that is 100% LEL.If the combustible gas concentration reached its lower explosive limit of only 10 per cent at this time we can call this place the gas explosion risk environment for the 10% LEL;can be gas for ambient air monitoring,often given directly to the gas environmental risk degree that the available gas content in the air with explosive limit expressed as a percentage: [% LEL].Lower explosion limit LEL combustible gas alarm and combustible gas detector is an important indicator.If the combustible gas environment in the explosion between the lower and upper explosive limit,and the following three conditions are true,it will explode.1 fuel (gas);2 combustion material (oxygen);3 ignition source (temperature).Alarm concentration is generally set at lower explosion limit of "60% LEL" below.

Common combustible gas data sheet
combustible material Formula Lower explosion limit
Upper Explosion limit
Hydrogen H2 4 75
Methane CH4 5 15
Acetylene C2H2 2.5 100
Carbon Monoxide CO 12.5 74
Ethylene C2H4 3.1 32
Ammonia NH3 15.5 27
Ethane C2H6 3 12.5
Hydrogen surfide H2S 4.3 45
Methyl acetylene C3H4 2.4 12
Propadiene C3H4 2.1 11.5
Propene C3H6 2.4 10.3
Cyclopropane (CH2)3 2.4 10.4
Ethylene oxide C2H4O 3 100
Propane C3H8 2.2 9.5
Chloromethane CH3Cl 8.1 17.2
1,3-Butadiene 1,3-C4H6 2 11.5
i-Butene i-C4H8 1.8 8.4
1-Butene C4H8 1.8 9.7
c-2-Butene C4H8 1.6 9.3
t-2-Butene C4H8 1.8 9.7
n-Butane n-C4H10 1.9 8.5
i-Butane i-C4H10 1.8 8.4
Carbonyl sulfide COS 12 28.5
Vinyl chloride C2H3Cl 4 22
n-Pentane n-C5H12 1.4 7.5
i-Pentane i-C5H12 1.4 7.5
Methyl bromide CH3Br 13.5 14.5
Chloroethane C2H5Cl 3.8- 15.4
Vinyl acetylene C4H4 1.7- 73.3
Methanol CH3OH 5.5 44
Alcohol C2H5OH 3.3 19
Benzene C6H6 1.3 7.1
Toluene C6H5CH3 1.2 7.1
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