文档介绍：受限空间安全
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Confined Space Statistics
Leading cause of occupational fatalities in this country
The Standard covers 240,000 workplaces and million workers
Workers make million entries/year
Standard may prevent 85% of fatalities and nearly 11,000 injuries
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Definition of a Confined Space (must meet all three criteria)
Limited means for entry or exit (manholes, vaults, & pits)
Large enough & so configured that an employee can bodily enter and
perform assigned work
Not designed for continuous occupancy
Two types – Permit & Non-Permit Required Spaces
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Definition of Permit-Required Confined Spaces
A confined space that has one or more of the following characteristics:
Contains or has potential to contain a hazardous atmosphere
Potential for engulfment
Internal configuration that can trap or asphyxiate entrant
Any other serious safety or health hazards (electrical, hot work, drowning . . .)
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What is a Hazardous Atmosphere?
An atmosphere that may expose employees to the risk of death, incapacitation, impairment of ability to self-rescue, or acute illness resulting from the following:
Flammable gas, vapor or mist in excess of 10% of the LFL
Combustible dust at a concentration that is > or =LFL
Oxygen concentration < % or > %
Any substance with concentration > PEL
Any other atmospheric concentration that is IDLH
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Permit-Required Spaces on Campus
Electrical vaults: electrical hazards, low oxygen, &/or asbestos
Sewer manholes: CO, low oxygen,
&/or toxic gases
Storm drain manholes:
CO, low oxygen, &/or toxic gases
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Permit-Required Spaces on Campus (cont)
Pool Pit: lack of oxygen, toxic gases,
&/or drowning
Sewer Tanks: toxic gases, low oxygen,
drowning, &/or electrocution hazards
Communication Vaults: low
oxygen, asbestos,
&/or electrical hazards
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Non-Permit Required Spaces
Spaces that do not contain or, with respect to atmospheric hazar