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Confined Spaces > Safety > Flashcards

Safety Flashcards

1
Q

Oxygen levels for safe entry

A

19.5%

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2
Q

Who is stationed outside a confined space?

A

Attendant

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3
Q

LFL lower flammability limit of flammable hazardous gases?

A

20%

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4
Q

Difference of the Upper Explosive limit UEL?

A

Explosive range

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5
Q

What type of pressure is created when pulling air out of a space?

A

Negative - Exhaust ventillation

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6
Q

How is air sampled in a confined space?

A

4ft intervals vertical and horizontally

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7
Q

What type of pressure is created when pushing air into a space?

A

Supply ventilation (positive)

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8
Q

When the makeup air is equal to the volume of the space it is known as?

A

One air exchange

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9
Q

Three elements for a fire?

A

Oxygen, fuel, heat

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10
Q

What is the order that an Atmosphere need to be tested?

A

Oxygen, flammable, toxicity hazards

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11
Q

Legal standard for the Maximum safe dose of a toxin is?

A

TLV- Threshold limit value

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12
Q

What is written on a confined space permit

A

Hazards, and entry conditions

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13
Q

Vapor density of Air

A

1

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14
Q

If ammonia is in the upper explosive limit UEL, what must you do to confined space?

A

Purge space, replace with clean breathable air.

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15
Q

What is chronic health effect

A

Long term

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16
Q

What type of ventillation captures contaminants at the source and removes them?

A

Local exhaust ventillation

17
Q

According to the molecular weight which chemicals would fall to the bottom?

A

Ones that are heavier

18
Q

Why is supplied ventilation preferred over exhaust ventillation

A

More effective and easier to push than pull

19
Q

What is meant when a toxic substance has a lower IDHL (immedite dangers to health and life) value?

A

Toxicity is greater

20
Q

What is the most common route of entry for a roxic substance?

A

Inhalation

21
Q

Hazardous space is deemed nonhazardous, what must an employer do?

A

Tell the guys in the confined space

22
Q

What is acute health effect

A

Immediate, short term effects

23
Q

What is the mininum depth at which an open top space is considered to be a confined space?

A

4ft

24
Q

What is done with the permit after workis completed in a confined space?

A

Canceled and retained -retained 1 year

25
Q

Who is responsible for identifying confined space hazards on a jobsite

A

Employer

26
Q

Who is the person responsible for authorizing dntry into a permit required confined space?

A

Entry supervisor

27
Q

What is the forumula to calculate one air exchange

A

Volume of space (lxwxh)
Effective airflow in cfm

= time for one air exhange

Confined Spaces (2 decks)

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