Search results
Results from the WOW.Com Content Network
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 (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 volume percent of oxygen. The LOC varies with pressure and temperature.
Consider the first triangular diagram below, which shows all possible mixtures of methane, oxygen and nitrogen. Air is a mixture of about 21 volume percent oxygen, and 79 volume percent inerts (nitrogen). 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 lower flammability limit (LFL), [1] usually expressed in volume per cent, is the lower end of the concentration range over which a flammable mixture of gas or vapour in air can be ignited at a given temperature and pressure. The flammability range is delineated by the upper and lower flammability limits. Outside this range of air/vapor ...
Additionally, oxygen must be present. [7] The flammability limits of gases are expressed in proportions to the other gases present. [citation needed] For example, for methane, research by Akifumi Takahashi et. al. shows limits between 4.4% for the lower explosive limit and the upper explosive limit at 16.3%. [8]
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 ...
The lower flammability limit or lower explosive limit (LFL/LEL) represents the lowest air to fuel vapor concentration required for combustion to take place when ignited by an external source, for any particular chemical. [29] Any concentration lower than this could not produce a flame or result in combustion.
New Jersey’s largest utility has asked the feds to halt all air traffic over two of its nuclear power plants — after drones were spotted over the sensitive sites, The Post has learned.