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AIR BAGS . 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

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types of air bags
Types of Air Bags
  • Low pressure high lift
  • High Pressure low lift
  • Square
  • Rectangle
  • Round
low pressure high lift
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
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
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
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
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 work1
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
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
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
Cribbing for air bags
  • 2x4
  • 4x4
  • At least 18 inches long
  • Wedges
  • Stair steps
cribbing for air bags1
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 bags2
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
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