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Comparison of Variability in Attainable Travel Distance & Human Performance Between 2 Types of SCSR

NOTE: This page is archived for historical purposes and is no longer being maintained or updated.


  • Previous research has shown performance variability between 4 models of SCSR, furthermore with body weight (Turner, et al., 2002). Others have indicated that the usable oxygen supply by a chemical oxygen SCSR is variable at high work rates, which would produce a wide variation of travel distance during an escape (Johnson, et al., 2007).
  • This investigation would measure the distance traveled while using a single submaximal work rate in order to evaluate whether the quantity of usable oxygen in two different types of SCSR affects escape distance.

Applicable Standards

  • 42 CFR Part 84, Subpart O
  • MINER Act

Key Partners

  • MSHA


  • Global mining industry
  • Respirator manufacturers
  • UMWA
  • ISO
  • NMA
Photos of different S C S Rs

Project Scope

  • While breathing from an SCSR, subjects (10 miners) would exercise on a treadmill at a submaximal level of energy expenditure (~1.35 L/min.) until fatigued, oxygen supply is exhausted, CO2 is not scrubbed effectively, FIO2 < 19.5%, or FICO2 > 4%
  • SCSR would include chemical oxygen (Draeger OXY-K Plus and CSE SR100) and compressed oxygen (Ocenco EBA 6.5 and Ocenco M20). Dockable-hybrid SCSR (TPI) will be included pending NIOSH-approval.
  • Results would determine whether use rate affects the quantity of usable oxygen provided by different SCSR.


  • FY10: determine experimental design and sample size requirements, write protocol, procure equipment, peer-review, obtain HSRB approval, recruit subjects.
  • FY10 - FY11: data collection, data analysis.
  • FY11: presentation(s) at conferences, submit manuscript to journals.


  • Manuscripts submitted to peer-reviewed journals
  • Presentations at national/international conferences
  • NIOSH guidance for SCSR manufacturers.


  • Review NIOSH guidance for SCSR breathing resistance and oxygen delivery systems.
  • Determine appropriate recommendations for improved SCSR management during an escape.
Photo of S C S Rs
Page last updated: April 5, 2010
Page last reviewed: April 5, 2010
Content Source: National Institute for Occupational Safety and Health (NIOSH)
National Personal Protective Technology Laboratory