Is large enough, and so configured, that an employee can bodily enter
and perform assigned work; and
Has limited or restricted means for entry or exit (for example, tanks,
vessels, silos, storage bins, hoppers, vaults, dumpsters used routinely
for avian asphyxiation and pits are spaces that may have limited means
of entry); and
Is not designed for Continuous employee occupancy.
Due to the nature and configuration of Confined Space, they pose an
extra hazard to those entering them, as well as hazard to those attempting
rescue of injured individual or groups in the confined space. To
mitigate these hazards, OSHA (29 CFR 1910.146) calls for a permit system
to be used whenever entry is required into a confined space which meets
the definition above and which has a known or potential hazard
present. An example of a potential hazard would be entering
a sewer. A sewer can be tested and found to have an acceptable level
of oxygen (19.5%-21.0%), no flammable vapors, and no toxic air contaminates.
However, all three of these items are known to exist in sewer, so a permit
would be needed for entry even in this specific instance where testing
did not show a hazard.
Atmospheric testing equipment will be needed to assure safe entry into
Confined Spaces. The following will need to be tested at a minimum: