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'''Minimum Ignition Energy (MIE)''' is the minimum amount of energy required to ignite a combustible vapor, gas or dust cloud, for example due to an [[electrostatic discharge]]. MIE is measured in [[joules]] (J). <ref> Pratt, Thomas H. "Electrostatic Ignitions of Fires and Explosions" Wiley-AIChE (July 15, 1997) Center for Chemical Process Safety </ref>
'''Minimum ignition energy (MIE)''' is the minimum amount of energy required to ignite a combustible vapor, gas or dust cloud, for example due to an [[electrostatic discharge]]. MIE is measured in [[joules]] (J). <ref> Pratt, Thomas H. "Electrostatic Ignitions of Fires and Explosions" Wiley-AIChE (July 15, 1997) Center for Chemical Process Safety </ref>


[[Explosive]]s, [[hydrogen]], [[unsaturated hydrocarbon]]s and [[alkane]]s in oxygen have the lowest MIE - range of {{e|-3}} to {{e|-1}} (mJ). Alkanes in air, distillate fuels, hybrid mixtures and extremely sensitive dusts have a MIE range of {{e|-1}} to {{e|1}} (mJ). Combustible dusts have a MIE range of {{e|1}} to {{e|4}} (mJ).
[[Explosive]]s, [[hydrogen]], [[unsaturated hydrocarbon]]s and [[alkane]]s in oxygen have the lowest MIE range of {{e|-3}} to {{e|-1}} (mJ). Alkanes in air, distillate fuels, hybrid mixtures and extremely sensitive dusts have a MIE range of {{e|-1}} to {{e|1}} (mJ). Combustible dusts have a MIE range of {{e|1}} to {{e|4}} (mJ).


For most materials, the lowest ignition energy value occurs at a concentration near the midpoint between those for the [[lower flammable limit]] (LFL) and the [[upper flammable limit]] (UFL). <ref> [[National Fire Protection Association|NFPA]] 77 - 2007; page 20 </ref>
For most materials, the lowest ignition energy value occurs at a concentration near the midpoint between those for the [[lower flammable limit]] (LFL) and the [[upper flammable limit]] (UFL). <ref> [[National Fire Protection Association|NFPA]] 77 2007; page 20 </ref>


== See also ==
== See also ==

Revision as of 03:05, 9 October 2011

Minimum ignition energy (MIE) is the minimum amount of energy required to ignite a combustible vapor, gas or dust cloud, for example due to an electrostatic discharge. MIE is measured in joules (J). [1]

Explosives, hydrogen, unsaturated hydrocarbons and alkanes in oxygen have the lowest MIE – range of ×10−3 to ×10−1 (mJ). Alkanes in air, distillate fuels, hybrid mixtures and extremely sensitive dusts have a MIE range of ×10−1 to ×101 (mJ). Combustible dusts have a MIE range of ×101 to ×104 (mJ).

For most materials, the lowest ignition energy value occurs at a concentration near the midpoint between those for the lower flammable limit (LFL) and the upper flammable limit (UFL). [2]

See also

References

  1. ^ Pratt, Thomas H. "Electrostatic Ignitions of Fires and Explosions" Wiley-AIChE (July 15, 1997) Center for Chemical Process Safety
  2. ^ NFPA 77 – 2007; page 20