mod 1.2

Question 1

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

Answer 1

Confined space

Question 2

Is not designed for continuous occupancy by the employee; and

Answer 2

Confined space

Question 3

Has a limited or restricted means of entry or exit.

Answer 3

Confined space

Question 4

Two Categories of Confined Space

Answer 4

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

Question 5

PRCS

Answer 5

Permit-Required Confined Space

Question 6

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

Answer 6

Confined space entry

Question 7

Common Confined Space Hazards
(6)

Answer 7

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)

Question 8

Is a leading cause of death among workers entering confined spaces

Answer 8

Lack of oxygen

Question 9

cannot be detected by sight or smell.

Answer 9

Low oxygen level

Question 10

Oxygen is used up when metals rust. t/f

Answer 10

True

Question 11

Oxygen is not used up during combustion. t/f

Answer 11

False

Question 12

Oxygen can be replaced by other gases. t/f

Answer 12

True

Question 13

Micro-organisms use up oxygen. t/f

Answer 13

True

Question 14

Minimum acceptable oxygen level

Answer 14

19.5%

Question 15

Decreased ability to work strenuously. Impaired coordination. Early symptoms

Answer 15

15-19%

Question 16

Respiration increases. Poor judgment

Answer 16

12-14%

Question 17

Respiration increases. Lips blue.

Answer 17

10-12%

Question 18

Mental failure. Fainting. Nausea. Unconsciousness. Vomiting

Answer 18

8-10%

Question 19

Coma in 40 seconds. Death

Answer 19

4-6%

Question 20

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

Answer 20

6-8%

Question 21

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

Answer 21

True

Question 22

Common toxic gases in confined space:

Answer 22

Hydrogen Sulfide, Carbon Monoxide

Question 23

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.

Answer 23

Loose and unstable materials

Question 24

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

Answer 24

Slips, trip and fall hazards

Question 25

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.

Answer 25

Slips, trip and fall hazards

Question 26

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.

Answer 26

Falling objects

Question 27

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

Answer 27

Moving parts of equipment and machinery

Question 28

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

Answer 28

Moving parts of equipment and machinery

Question 29

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.

Answer 29

Electrical shock

Question 30

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.

Answer 30

Substances entering through piping

Question 31

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

Answer 31

Poor visibility

Question 32

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

Answer 32

Noise

Question 33

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

Answer 33

Risk of drowning

Question 34

Basic Principles of Confined Space Safety:(3)

Answer 34

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

Question 35

lighter than air

Answer 35

Methane

Question 36

same as air

Answer 36

Carbon monoxide

Question 37

heavier than air

Answer 37

Hydrogen sulfide

Question 38

Order of Gas Testing: (4)

Answer 38

1. Oxygen 2. Flammable gases 3. Toxic gases 4. Others

Question 39

Testing Points:

Answer 39

a. Bottom b. Middle c. Top

Question 40

Things to consider in Emergency Planning:(6)

Answer 40

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