Vehicle Extrication

Question 1

What are the spreading,pulling and weight for the Hurst Defender Spreaders?

1. Spread force
2. Pull force

Answer 1

1. Spread force: 44,000lbs
2. Pull Force: 6969lbs

Question 2

Cutting force and Max opening of Hurst MOC II Cutters?

1. Pressure
2. max opening

Answer 2

1. 153K lbs (rounded)
2. 7” max opening

Question 3

What are the operating pressures and test pressure of MaxiForce Air Bag system?

Answer 3

Operating pressure: 118psi Test pressure: 200psi

Question 4

What are the maximum amount of air bags one can stack and how do you stack them?

Answer 4

• Two bags maximum when stacking.
• Stack from largest to smallest.
• Ensure nipples are on opposing sides.
• Line up X’s on each airbag and under lift point

Question 5

Describe the 5, 10, 20 rule.

Answer 5

• 5” side airbag
• 10” steering wheel
• 20” passenger airbag

Question 6

What is an inner circle?

Answer 6

Any hazard on, under, inside, and directly around the vehicle: Leaks, unstable vehicle, air bags not deployed, victim, etc… Where extrication/Disentanglement/rescue takes place.

Question 7

What are the spreading forces and lenghts of of the T41 & T59 Telescoping Rams.

Answer 7

Both are: 1st piston: 29,830lbs 2nd piston: 14,830lbs

T41- 18” retracted - 41” extended

T59 - 24” retracted - 59” extended

Question 8

How do you stabilize a vehicle before extrication?

Answer 8

1. Set car in park Set parking brake Turn off ignition Remove keys and give to Capt.
2. Set up step chaulks (triangle) three points of contact
3. Remove air from tires in order to have vehicle resting on chaulks
4. Use Rescue 42’s on vehicles not upright

Question 9

What are the species of wood for our cribbing?

Answer 9

Douglas Fir or Southern Pine Does not splinter when fails. Gives early warning signs prior to failure.

Question 10

What are the maximum load capacities for our cribbing and at its intersections?

Answer 10

Max load: 500 psi Max load at intersection: 6000lbs

Question 11

What do you do before you start cutting?

Answer 11

Peel and peek

Question 12

For all Airbags

1. Dimentions
2. Max lift weight
3. Max lift height
4. psi
5. Burst pressure

Answer 12

KPI 17

1. 15”x21”x3/4”
2. Max lifting 15 tons
3. Max lifting height 9”
4. 118 psi
5. 475 psi

KPI 22

1. 20”X20”X3/4”
2. Max Lifting 20 tons
3. Max Lifting Height 11”
4. 118 psi
5. Burst Pressure 600psi

KPI 32

1. 24”x24”x3/4”
2. Max Lifting 30 tons
3. Max lifting height 13”
4. 118 psi
5. Burst Pressure 700psi

KPI 44

1. 28”x28”x3/4”
2. Max Lifting 44 tons
3. Max lifting height 15.5”
4. 118 psi
5. Burst Pressure 700psi

Question 13

Airbag construction

Answer 13

• minimum three plies of neoprene and neoprene coated Kevlar both top and bottom
• ⅛” NPT female connection

Question 14

What are the different crib beds?

Answer 14

1. Box
2. Crosstie
3. Solid Platform
4. Triangle
5. Parallelgram

Question 15

What are the woods used in cribbing? And why?

Answer 15

Douglas Fir and Southern Yellow Pine

Failure is slow, noisy crushing which provides advanced warning of failure.

Question 16

What is the minimum lenght of cribbing and how much should overhang on the intersections?

Answer 16

• At least 18” long
• Must overlap at least 4” at intersections

Question 17

Hydraulic Hose

1. How long
2. Whats it made of
3. Burst pressure
4. Type of connections

Answer 17

1. 16ft
2. kevlar reinforcement polyurethane
3. 20,000
4. “hot swap quick connect” couplines

Question 18

Hurst Simo Unit

1. HP
2. Hydrolic resevoir capacity
3. Fuel Capacity
4. PSI

Answer 18

1. 3hp @ 3600rpm
2. .92 gal
3. .81qts
4. stage 1: 0-2k psi - stage 2 2001-5k psi