Report of Investigations 9192: Rapid (Grab) Sampling During Full-Scale Explosions - Microscopic and Analytical Evaluation

Details

• Journal Article:
  Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9192
• Personal Author:
  Conti, Ronald S. ; Zlochower, Isaac A. ; Sapko, Michael J.
• Description:
  The Bureau of Mines has developed a system using a high-speed electropneumatic mechanism for the rapid (grab) sampling of dusts and gases during an explosion. The sampling system consists of an aluminum housing that incorporates two 30-cm3 pre-evacuated glass vials with rubber septums. Upon actuation, the sampling probe needle is driven through the septum with a pressurized air pulse, filling the tube with gas and dust from the mine explosion. After a predetermined time, the sampling probe needle is retracted by a second high-pressure air pulse to its normal (quiescent) state, allowing the sampling tube to reseal. The onset and the duration of sampling are independently variable and controlled by a time-delay relay package. This technique enables the monitoring of pyrolysis-charring in coal particles and the generation and combustion of the pyrolysis vapors in both large- and small-scale explosions. The following results were obtained from full-scale dust explosion tests at the Bureau of Mines Lake Lynn Laboratory: (1) gas sampling of the leading edge of the flame front shows the large concentration changes, characteristic of the flame front; (2) gas samples taken entirely in the flame zone consist of pyrolysis and combustion products with very low residual oxygen; and (3) the particles collected in the flame zone show signs of extensive pyrolysis and charring. [Description provided by NIOSH]
• Subjects:
  Coal Coal Mining Dust Mining Occupational Health Safety
• Keywords:
  Mining-industry; Mine-disasters; Mine-fires; Sampling-equipment; Sampling-methods; Coal-mining; Dust-explosions; Combustion-products
• Source:
  Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9192, 1988 Jan; :1-17
• Series:
  Mining Publications   ; NIOSH Numbered Publications  
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PRC - Pittsburgh Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  23 pdf pages
• NIOSHTIC Number:
  nn:10006240
• NTIS Accession Number:
  PB90-268756
• Federal Fiscal Year:
  1988
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:1ac70dda9f7d51a96c32b781907945b5b7b8c14447c1d2755b2ef585f351fb062c18b6beef6dde45bf4a9cc42292023cce4ab2a40cfb94eeb5716a72fdfe3bde
• Download URL:
  https://stacks.cdc.gov/view/cdc/9589/cdc_9589_DS1.pdf
• File Type:
  [PDF - 3.18 MB ]