Chapter 10 Flashcards
Rescuers are reportedly 60% of all confined space victims in the U.S.
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Unless only one entrant will fit into a confined space, the entry team should be composed of at least two responders.
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Retrieval systems provide a measure of safety for responders entering the confined space.
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Retrieval systems consist of a retrieval line attached to either a full body harness or to wristlets.
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A supplied air breathing apparatus system will allow an entrant to remain in a confined space for longer period than a self contained breathing apparatus.
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When entering a confined space, responders should have a tag line attached to their harness, which can also serve as a primitive means of communication.
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If site plans or blue prints are available, they should be obtained and used during the evaluation and planning process.
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Before workers are allowed to enter a permit required space, the employer must prepare an entry permit.
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The AHJ may require that responders complete a confined space entry permit before entering the space.
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The atmosphere should be sampled at the top, middle, and bottom of a space, or at 4 foot intervals.
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Sampling the atmosphere helps determine the need for forced ventilation and the type of respiratory protection required for rescuer safety.
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During recovery operations, it may be more prudent to wait until mechanical ventilation has restored a safe atmosphere before reentering.
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Air monitoring tubing should not be placed directly into a potentially hazardous material and should remain above the floor of any space that is monitored.
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Attractive nuisance - a location or feature that attracts curious children or adults and is likely to require technical rescue if appropriate caution is not exercised.
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Agricultural storage silos and elevators present unique dangers, particularly because of the potential for engulfment.
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Storm sewers are below grade confined spaces that direct runoff toward rivers and streams.
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Coffer dams inside storage tanks provide a protected work space.
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Cisterns are tanks that are designed to collect and store water and are often underground.
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Coffer dams are watertight barriers installed or constructed to provide a relatively dry environment in which to work.
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Absorption and adsorption are mechanisms of contamination that occur when the porous materials of which the enclosure is constructed either absorb contaminants form outside the vessel or adsorb materials formerly contained within it.
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Desorption occurs when a container leaches a contaminant out of its containment and into the confined space where it is housed.
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One of the most common forms of biological activity with which responders must be concerned is fermentation.
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The biological activity in raw sewage produces hydrogen sulfide gas, in confined spaces such as pipelines and trunks, lethal concentration are quite likely.
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Absorption - adherence of a substance in a liquid or gas to a solid, this is surface based.
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