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osh midterm > mod 1.2 > Flashcards

mod 1.2 Flashcards

1
Q

Is large enough for an employee to enter fully and perform assigned work;

A

Confined space

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2
Q

Is not designed for continuous occupancy by the employee; and

A

Confined space

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3
Q

Has a limited or restricted means of entry or exit.

A

Confined space

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4
Q

Two Categories of Confined Space

A

-Open-topped enclosures with depths which restrict the natural circulation of air
-Enclosures with limited opening for entry and exit

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5
Q

PRCS

A

Permit-Required Confined Space

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6
Q

Is considered to have occurred when any part of a person’s body
crosses the plane of an opening into the space.

A

Confined space entry

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7
Q

Common Confined Space Hazards
(6)

A
  1. Oxygen deficiency
  2. Oxygen-enriched atmosphere
  3. Flammable/Explosive Atmospheres
  4. Toxic Atmospheres
  5. Temperature extremes
  6. Physical Hazards (noise, slip, trip, falls, falling objects, equipment, electrical)
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8
Q

Is a leading cause of death among workers entering confined spaces

A

Lack of oxygen

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9
Q

cannot be detected by sight or smell.

A

Low oxygen level

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10
Q

Oxygen is used up when metals rust. t/f

A

True

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11
Q

Oxygen is not used up during combustion. t/f

A

False

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12
Q

Oxygen can be replaced by other gases. t/f

A

True

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13
Q

Micro-organisms use up oxygen. t/f

A

True

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14
Q

Minimum acceptable oxygen level

A

19.5%

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15
Q

Decreased ability to work strenuously. Impaired coordination. Early symptoms

A

15-19%

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16
Q

Respiration increases. Poor judgment

A

12-14%

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17
Q

Respiration increases. Lips blue.

A

10-12%

18
Q

Mental failure. Fainting. Nausea. Unconsciousness. Vomiting

A

8-10%

19
Q

Coma in 40 seconds. Death

A

4-6%

20
Q

8 minutes - fatal
6 minutes - 50% fatal
4-5 minutes - possible recovery

A

6-8%

21
Q

Too much oxygen greatly increases the risk of fire or explosion
in the confined space.
t/f

A

True

22
Q

Common toxic gases in confined space:

A

Hydrogen Sulfide, Carbon Monoxide

23
Q

Whenever unstable solids made of small particles like sand or grain are stored in enclosures,
there is a danger of the materials flowing onto workers and trapping or burying them.

A

Loose and unstable materials

24
Q

The space you are about to enter may have a hatchway that is difficult to squeeze through, and
ladders for ascending or descending.

A

Slips, trip and fall hazards

25
Q

You are therefore at risk of falling while getting into the
space as well as while you are inside. In addition, the flooring of tanks or other wet environments
or the rungs of a ladder may be very slippery.

A

Slips, trip and fall hazards

26
Q

In a confined space there may be the danger of being struck by falling objects such as tools or
equipment, particularly if access ports or workstations are located above workers.

A

Falling objects

27
Q

Mechanical equipment such as augers, mixers, or rotating tanks can be dangerous if activated or
not secured.

A

Moving parts of equipment and machinery

28
Q

Residual energy, such as gravity or accumulated pressure, may also pose a risk
unless the equipment is locked out and de-energized.

A

Moving parts of equipment and machinery

29
Q

All electrical sources that pose a hazard to workers inside the space must be locked out following
the written lockout procedure for the particular confined space.

A

Electrical shock

30
Q

Piping adjacent to a confined space could contain liquids or gases or other harmful substances.
Substances must be prevented from entering the confined space through piping. This is done by
“isolating” the piping from the confined space.

A

Substances entering through piping

31
Q

Emergency lighting such as flashlights or battery-operated area units must be provided where
necessary, so that workers can locate exits and escape.

A

Poor visibility

32
Q

produced in confined spaces can be particularly harmful because of reflection off walls

A

Noise

33
Q

Confined spaces should be fully drained or dry when entered. Spaces that are not fully drained
or dry may pose a——————

A

Risk of drowning

34
Q

Basic Principles of Confined Space Safety:(3)

A
  1. Avoid confined space entry
  2. Establish Safe systems of work
  3. Prepare Emergency plans
35
Q

lighter than air

A

Methane

36
Q

same as air

A

Carbon monoxide

37
Q

heavier than air

A

Hydrogen sulfide

38
Q

Order of Gas Testing:
(4)

A
  1. Oxygen
  2. Flammable gases
  3. Toxic gases
  4. Others
39
Q

Testing Points:

A

a. Bottom
b. Middle
c. Top

40
Q

Things to consider in Emergency Planning:(6)

A

• Communications
• Liaison and rescue
• Shutdown
• First Aid Procedures
• Drills
• Emergency services contact

osh midterm (4 decks)

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