Safety Flashcards
(27 cards)
Oxygen levels for safe entry
19.5%
Who is stationed outside a confined space?
Attendant
LFL lower flammability limit of flammable hazardous gases?
20%
Difference of the Upper Explosive limit UEL?
Explosive range
What type of pressure is created when pulling air out of a space?
Negative - Exhaust ventillation
How is air sampled in a confined space?
4ft intervals vertical and horizontally
What type of pressure is created when pushing air into a space?
Supply ventilation (positive)
When the makeup air is equal to the volume of the space it is known as?
One air exchange
Three elements for a fire?
Oxygen, fuel, heat
What is the order that an Atmosphere need to be tested?
Oxygen, flammable, toxicity hazards
Legal standard for the Maximum safe dose of a toxin is?
TLV- Threshold limit value
What is written on a confined space permit
Hazards, and entry conditions
Vapor density of Air
1
If ammonia is in the upper explosive limit UEL, what must you do to confined space?
Purge space, replace with clean breathable air.
What is chronic health effect
Long term
What type of ventillation captures contaminants at the source and removes them?
Local exhaust ventillation
According to the molecular weight which chemicals would fall to the bottom?
Ones that are heavier
Why is supplied ventilation preferred over exhaust ventillation
More effective and easier to push than pull
What is meant when a toxic substance has a lower IDHL (immedite dangers to health and life) value?
Toxicity is greater
What is the most common route of entry for a roxic substance?
Inhalation
Hazardous space is deemed nonhazardous, what must an employer do?
Tell the guys in the confined space
What is acute health effect
Immediate, short term effects
What is the mininum depth at which an open top space is considered to be a confined space?
4ft
What is done with the permit after workis completed in a confined space?
Canceled and retained -retained 1 year
