Probability of spark ignition in intrinsically safe circuits

Details

• Personal Author:
  Cawley, James C.
• Corporate Authors:
  United States. Bureau of Mines
• Description:
  "This report presents results of recent Bureau of Mines research to establish the probability of spark ignition as a function of current (or voltage, for capacitor circuits) for resistive, inductive, and capacitive circuits in 8.3-Pct methane-air atmospheres. The data presented quantify the explosion hazard created when low-power electronic devices catastrophically fail in an explosive mine atmosphere. Previous literature dealt with levels of probability between 10-3 and 10-4. This report extends the probability data to levels as low as 10-7. This study has verified that when the probability of ignition, pi, is plotted on a log-log coordinate system versus the current (or voltage), a continuous, straight-line relationship is formed. An interesting result that can be statistically hypothesized is that at some low level of igniting current the ignition process ceases altogether." - NIOSHTIC-2
  
  NIOSHTIC no. 10006150
  
  
• Subjects:
  Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  15 numbered pages
• NIOSHTIC Number:
  nn:10006150
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:7df8c71202cf9cb0756e7d9e81cbe47aaa76683f8f9b8c1b8597ce34cef056476b63f05436f8e74f0e5620404a9fc603002b4ce62d0025800905265eac50b7ac
• Download URL:
  https://stacks.cdc.gov/view/cdc/10643/cdc_10643_DS1.pdf
• File Type:
  [PDF - 7.36 MB ]