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Is there any guidance (or standard) relating the maximum air temperature/heat index an employee can work inside of a confined space?

RegSenseHazmat SafetyHeat and Cold ExposureSafety & HealthExtreme Temperature PreparationHeat and Cold ExposureTransportationConfined SpacesConfined Space HazardsConfined SpacesConfined Space Testing and Protective MeasuresEnglishHeat StressFleet SafetyConstruction SafetyGeneral Industry SafetyAgriculture SafetyMaritime SafetyBest ResultsFAQMine SafetyFocus AreaUSA

The Confined Space standard, 1910.146, doesn't specify STLs for heat. However, the standard does call out the following as a definition of permit-required confined space (PRCS) that could include excessive heat and require controls to be put in place before entry:

  • Contains or has a potential to contain a hazardous atmosphere (e.g., paint thinner).
  • Contains a material that has a potential for engulfing the entrant (e.g., liquid, soil).
  • Contains inwardly converging walls or a floor that slopes downward and tapers to a smaller cross-section where an entrant could be trapped or asphyxiated.
  • Contains any other recognized serious safety or health hazard (e.g., unsafe temperature, electrical shock, corrosive chemicals).

OSHA highlights in their National Emphasis Program – Outdoor and Indoor Heat-Related Hazards the National Weather Service (NWS) classifications of environmental heat exposure using their heat index as a guide for inspectors. These are:

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['Heat and Cold Exposure', 'Confined Spaces']
['Heat Stress', 'Heat and Cold Exposure', 'Confined Space Testing and Protective Measures', 'Confined Space Hazards', 'Confined Spaces', 'Extreme Temperature Preparation']
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