Res 5A SOG Confined Space

Question 1

Definition of confined space

Answer 1

1) a person can enter and perform work
2) has limited or restricted means of entry/exit
3) is not designed for continuous occupancy

Question 2

Confined space entry starts

Answer 2

as soon as any part of the body breaks the plane of the opening

Question 3

Hazardous Atmospheres definition

Answer 3

exposes personnel to the risk of death, incapacitation, injury, acute illness, or impairment of the ability to self rescue

Question 4

Hazardous Atmosphere types examples

Answer 4

1) Flammable gas in excess of 10% LFL
2) airborne combustible dust, if vision is obscured at a distance of 5 feet or less it may be within flammable range
3) O2 below 19.5 or above 23.5
4) Atmospheric concentration of HM that are in excess of dose or PEL.
5) any other IDLH

Question 5

Permit Required Confined Space (vs non permit req)

Answer 5

1) contains or has potential to contain a hazardous atmosphere
2) contains material that has the potential for engulfing an entrant
3) has an internal configuration that could trap or asphyxiate
4) any additional safety or hazard including fall, environmental, or equipment hazards

Question 6

Zero Mechanical State

Answer 6

mechanical potential energy of all equipment or machines is set so opening will not produce a movement that could cause injury

Question 7

Seven phases of Confined Space

Answer 7

1) Scene Prep
2) Entry prep
3) Atmosphere Monitoring
4) Entry
5) Victim Removal
6) Safety Considerations
7) Termination

Question 8

Lock out

Answer 8

Equipment in ZMS, Electrical locked out in open position with key type pad lock, hydraulic or feed lines disconnected, blanked or blinded, all tagged with confined space tag system

Question 9

Who gets the keys of the lock out

Answer 9

entry supervisor

Question 10

What to do if lock out is not possible

Answer 10

tag and provide physical security

Question 11

SCBA use

Answer 11

Within 25 feet of entry and only if SCBA does not have to be removed to enter. Victim within sight of entrance. Rule of 3: 1/3 enter locate work 1/3 to exit 1/3 reserve

Question 12

Atmospheric monitoring order

Answer 12

1) O2
2) Flammable gases vapors
3) Toxic air contaminants

Question 13

Atmospheric IDLH

Answer 13

O2 >23.0 <19.5
LFL 10%
Toxicity exceeding PEL

Question 14

Atmospheric readings every

Answer 14

5 minutes and recorded on permit

Question 15

Air monitoring manhole or top down

Answer 15

Read from bottom up stopping every 2-4 feet to ensure no stratification

Question 16

Air monitoring side or bottom entrance

Answer 16

Use rods, poles or other means to extend into. Start at entry bottom and move up and to the rear

Question 17

Entry team members work time

Answer 17

30 minutes

Question 18

Entry attendant responsibilities

Answer 18

Tracking system to log entry times and names, establish constant comms, monitor and record atmosphere but turn over responsibility once manpower is available

Question 19

Entry finds victim and determines rescue, following occurs

Answer 19

1. Does victim need SCBA SABA
2. Can victim be moved with equipment carried
3. Determine feet or head first
4. C Spine if possible
5. MA appropriate to weight

Question 20

Safety consideration entry members positioning

Answer 20

team members stationed on the egress side of victim in case victim is lodged

Question 21

Safety consideration movement through opening

Answer 21

As quick as possible so not to block egress, have a plan before movement through

Question 22

Safety consideration air lines

Answer 22

Clear air lines from path to avoid entanglement or pinching

Question 23

List of personnel assignments

Answer 23

Rescue Group Supervisor/Entry Supervisor   Attendant/Communication Operator   
Entrant   
Standby Entrant   
Rescue Safety Officer   
Rigging   
Ventilation  
Air Supply   
Monitoring

Question 24

Minimum PPE for Entry and Back Up

Answer 24

Nomex coveralls, 
Nomex hood, 
Eye pro, 
Class III Harness,  
Helmet,  
Two intrinsically safe lights,   
meter,  
SCBA/SABA with PASS,  
consider chemical resistant clothing/ear pro

Question 25

Ventilation issues recirculation

Answer 25

exhausted air is too close to air inlet.

Separate the two.

Question 26

Ventilation issues short circuiting

Answer 26

when fresh air does not reach bad air,

extend duct farther into space

Question 27

Ventilation issues chimney effect

Answer 27

when fan is not powerful enough to force air into space, air returns up around the duct. Place duct in a corner to diffuse air by causing turbulent ricochet effect

Question 28

Ventilation tactics (openings at both ends)

Answer 28

easiest method, fresh air in one opening, exhaust out the other

Question 29

Ventilation tactics (one opening)

Answer 29

Attach inlet duct to fan to prevent recirculation and push outlet duct into space

Question 30

Ventilation tactics (flammable/toxic air with one opening)

Answer 30

Use negative pressure, use outlet duct on fan to direct bad air from opening

Question 31

Ventilation tactics (Flammable/toxic that is heavier than air)

Answer 31

Negative pressure but get duct near bottom of space and outlet duct to direct bad air

Question 32

Ventilation tactic (Flammable/toxic that is lighter than air)

Answer 32

two fans, inlet air to the bottom, exhaust air duct around the top