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FAQ

Why can’t a worker rely on sight and sense of smell to detect toxic atmospheres?

What does “hazardous atmosphere” mean?

Can entry into an empty tanker truck that contained only non-hazardous liquid be reclassified as a non-permit confined space?

Are the hazards posed by a confined space to be considered in determining whether a space meets the definition of a confined space?

How do combustible dust atmospheres develop?

What kinds of hazards are most likely to be encountered in confined spaces?

What is an entrapment hazard?

Why is it important to thoroughly test any confined space?

What is engulfment?

Why do toxic substances become much more dangerous in confined spaces?

Why do permit spaces kill people?

Why is communication important in permit space work and what are some types of communication systems?

Why is it important to ventilate permit spaces?

What steps are necessary in order to safeguard workers against engulfment hazards?

Why are combustible and flammable gases and vapors dangerous?

What safeguards can be used to protect from pressurized lines, ducts, or pipes?

What is oxygen deficiency and how does it develop?

What if flammable atmospheres cannot be controlled by ventilation?

What are some types of mechanical hazards that may be encountered in confined spaces?

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