Loss of start-up oxygen in CSE SR-100 self-contained self-rescuers

Details

• Personal Author:
  Ahlers, Heinz ; Ann, Roland B. ; Stein, Robert R.
• Corporate Authors:
  National Institute for Occupational Safety and Health. National Personal Protective Technology Laboratory ; United States. Mine Safety and Health Administration
• Description:
  "This report describes a National Institute for Occupational Safety and Health (NIOSH) and Mine Safety and Health Administration (MSHA) investigation assessing the prevalence of a lack of sufficient start-up oxygen in CSE SR-100 self-contained self-rescuer (SCSR) devices. The availability of sufficient start-up oxygen is critical to the performance of the SR-100. As part of a routine field testing program of SCSRs used in coal mines, NIOSH and MSHA detected two SR-100s that lacked sufficient start-up oxygen. CSE Corporation subsequently discovered one SCSR that lacked sufficient start-up oxygen in that company's internal quality control program and voluntarily stopped further production and sales of SR-100s. NIOSH developed a protocol to test for the presence of start-up oxygen in field-deployed SR100s. The purpose of the test was to determine if the failure rate of the start-up oxygen in the population of 70,000 field-deployed units exceeded 1%. NIOSH and MSHA used American Society for Quality (ASQ), Sampling Procedures and Tables for Inspection of Isolated Lots by Attributes (ASQC Q3-1988). In assessing the SR-100s, if no more than 3 failures of start-up oxygen occurred in the 500-unit random sample, the SR-100 could be accepted as meeting the Limiting Quality (LQ) rate of 1.25% for start-up oxygen performance. NIOSH tested five hundred field-deployed devices collected from coal mines throughout the United States. NIOSH observed 5 start-up oxygen failures in the 500 units it tested. The maximum number of failures allowed under the LQ rate of 1.25% was exceeded
  
  therefore, the 1% maximum allowable failure rate under the protocol was not met." - NIOSHTIC-2
  
  
• Content Notes:
  Robert Stein, Heinz Ahlers, Roland Berry Ann.
• Subjects:
  Occupational Health Safety
• Series:
  NIOSH Numbered Publications
• DOI:
  https://doi.org/10.26616/NIOSHPUB2012139
• Document Type:
  Text
• Genre:
  Pamphlet (or booklet)
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  electronic ; vi, 16 p. : ill. ; 28 cm.
• NIOSHTIC Number:
  nn:20040634
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:80b5c35df4f84afffb09143a54eb7dc4a44bc61afa0ff27a5743ae5c7a2c2b4c114d10de48c7e2ebe70c90e5ed0f879d34dda256a7e5bdab20dc08fb1ce6c5ef
• Download URL:
  https://stacks.cdc.gov/view/cdc/11813/cdc_11813_DS1.pdf
• File Type:
  [PDF - 1.95 MB ]