Report of Investigations 8613: Effect of Direct-Current Firing Levels on Detonator Delay Times

Details

• Personal Author:
  Becker, Karl R. ; Hay, J. Edmund
• Corporate Authors:
  United States. Bureau of Mines
• Description:
  Detonators representing a sampling of various domestic commercial delay detonators were fired at various direct-current (dc) firing levels. Results of firings using well-below-recommended firing levels showed marked increases in delay times above the nominal values. There was also a marked increase in variation, to the extent that out-of-sequence firings would be essentially assured in any typical blasting round at these low firing levels. Within the range of recommended levels the effects of current increases were not considered to be of great importance relative to other overriding effects, such as the significant difference noted in average values of detonators from different lots having the same nominal delay. This effect, when combined with the normal variation noted among members from the same lot, would cause out-of-sequence firings with detonators from a neighboring delay period. Where comparisons with results from another study were possible, it was found that both studies observed quite similar variations in delay times about the average values, and a lower probability of out-of- sequence firings for the shorter delay period groups. [Description provided by NIOSH]
• Subjects:
  Explosions Mining Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• ISSN:
  1066-5552 (print)
• Publisher:
  United States. Bureau of Mines
• Document Type:
  Text
• Genre:
  Case Report
• Rights:
  Public Domain
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PRC - Pittsburgh Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  26 pdf pages
• NIOSHTIC Number:
  nn:10002281
• Citation:
  NTIS: PB/82-195405; :1-13
• Federal Fiscal Year:
  1982
• Peer Reviewed:
  False
• Source Full Name:
  NTIS: PB/82-195405
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:56a01d898da666429205a7256deae08c18a7cf1ab970c5c3cd8036be18f97f2fe2427c4309be97455a4817401f4d65ad216823dcfce87e26a6db0cd765d0e8ad
• Download URL:
  https://stacks.cdc.gov/view/cdc/201745/cdc_201745_DS1.pdf
• File Type:
  [PDF - 774.88 KB ]