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AIR BAGS

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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AIR BAGS

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  1. AIR BAGS

  2. Types of Air Bags • Low pressure high lift • High Pressure low lift • Square • Rectangle • Round

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. Cribbing for air bags • 2x4 • 4x4 • At least 18 inches long • Wedges • Stair steps

  12. 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

  13. 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

  14. 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

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