AIR BAGS - Georgia College of Vehicle Rescue
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Transcript AIR BAGS - Georgia College of Vehicle Rescue
Types of Air Bags
Low pressure high lift
High Pressure low lift
Square
Rectangle
Round
Low pressure high lift
Usually in a cubical or cylindrical shape
Common operating pressure of 15 psi
Ability to lift higher than high pressure
bags
Require more clearance to put in place
up to 2 inch
Unstable till fully inflated
Not commonly used for rescue
High pressure low lift
Can be round, square or rectangular
High lifting capacity
Low clearance needed as little as 1 inch
Limited lifting height
Stiff and heavy to handle
Looses stability as the height increases
Square air bags
Used mostly for high pressure systems
Offers best power versus lifting height
Relatively stable at low lifting height
Bag rounds out as it lifts becoming less
stable
Max lift is rated at 1 inch high
Rectangular air bags
Used in both low and high pressure
systems
When it inflates it resembles a log
Stable on one direction at any height
How air bags work
To figure the lifting capacity multiply
length x width x the working pressure of
the bag
10’x 10’= 100
100 x116 = 11600
116 is the working psi
Bag is rated at 11,600 pounds
How air bags work
Power curve
When deflated the bag is flat
As it is inflated it forms a pillow shape
As the height increases the contact
patch decreases
The higher the bag lifts it losses it’s lift
capacity
Stacking air bags
Not recommended
But not out of the question
Do not stack more than 2 high
Largest bag on bottom
Inflate largest bag first
Inflate no more than two thirds of either
bag
Lifting with air bags
Always crib when you lift
Lift an inch crib an inch
Crib on all sides of the object not to
allow lateral movement
NEVER assume an air bag is stable
ALWAYS CRIB AS YOU LIFT
Cribbing for air bags
2x4
4x4
At least 18 inches long
Wedges
Stair steps
Cribbing for air bags
Crib at two points on the down side of
the vehicle
Place a crib box next to the lifting point
Use of box cribbing is recommended
Crib as you lift
Cribbing for air bags
To gain lifting height use a solid base for
the bag to sit on
Crib tower should not be taller than it is
wide
Air Bag Safety
Always inspect before use
Use manufactures recommendations
Lift an inch crib an inch
Provide edge protection for the bags
Do not stack more than 2 high
Have line of sight between the controller
and person calling the lift