Engineering:Maximum experimental safe gap

From HandWiki

Maximum experimental safe gap (MESG) is a standardized measurement of how easily a gas flame will pass through a narrow gap bordered by heat-absorbing metal. MESG is used to classify flammable gases for the design and/or selection of electrical equipment in hazardous areas, and flame arrestor devices.[1] The National Electric Code classifies Class I hazardous locations into different groups depending on the respective MESG's of gases in the area.[2]

Examples

NEC Class I Group and Gas MESG[2]
NEC Class I Group Gas MESG Example Gas
Group A 0.25 mm Acetylene
Group B ≤0.45 mm (Except acetylene) Hydrogen
Group C 0.45 mm < x ≤ 0.75 mm Ethylene
Group D > 0.75 mm Propane

References

  1. ↑ Enardo Flame Arrestor Technology. "Flame Arrestor Technology". http://www.enardo.com/pdfs/tech_paper_fat.pdf. 
  2. ↑ 2.0 2.1 [1][|permanent dead link|dead link}}] Class I: Flammable gases, vapors or liquids

http://site.ul.com/global/documents/offerings/services/hazardouslocations/CI_groups.pdf[yes|permanent dead link|dead link}}]



Retrieved from "https://handwiki.org/wiki/index.php?title=Engineering:Maximum_experimental_safe_gap&oldid=281059"