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The term is considered by many safety professionals to be the same as the lower explosive level (LEL). At a concentration in air lower than the LFL, gas mixtures are "too lean" to burn. Methane gas has an LFL of 4.4%. [1] If the atmosphere has less than 4.4% methane, an explosion cannot occur even if a source of ignition is present.
The limiting oxygen concentration is shown in the lower right of the diagram. The limiting oxygen concentration (LOC), [1] also known as the minimum oxygen concentration (MOC), [2] is defined as the limiting concentration of oxygen below which combustion is not possible, independent of the concentration of fuel. It is expressed in units of ...
Any mixture of methane and air will therefore lie on the straight line between pure methane and pure air – this is shown as the blue air-line. The upper and lower flammability limits of methane in air are located on this line, as shown (labelled UEL and LEL, respectively). The stoichiometric combustion of methane is: CH 4 + 2O 2 → CO 2 + 2H ...
A gas explosion is the ignition of a mixture of air and flammable gas, typically from a gas leak. [1] In household accidents, the principal explosive gases are those used for heating or cooking purposes such as natural gas , methane , propane , butane .
1400 ppm: 141797 (10% Lower explosive limit LEL) 72-43-5: 1306: Methoxychlor: 5000 mg/m 3-72435, carcinogenic substance 79-20-9: 0507: Methyl acetate: 9393 mg/m 3: 3100 ppm: 79209 (10% Lower explosive limit LEL) 74-99-7: 0560: Methyl acetylene: 2788 mg/m 3: 1700 ppm: 74997 (10% Lower explosive limit LEL) 59355-75-8-Methyl acetylene-propadiene ...
The Bay Area Air Quality Management District has fined Berkeley after finding explosive levels of methane leaking from at least two cracked gas collection wells in the park. Both have since been ...
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The flammability limits of the gas define those proportions, i.e. the ignitable range. In combustion engineering terms, the admission of inert gas can be said to dilute the oxygen below the limiting oxygen concentration. Inerting differs from purging. Purging, by definition, ensures that an ignitable mixture never forms. Inerting makes an ...