Snohomish County Training officers 2nd Quarter 2017
SNOHOMISH COUNTY TRAINING OFFICERS 2ND QUARTER 2017 Rescue Airbags There are many different brands and types of airbags in the industry. For this course we are going to focus on high pressure airbags.
Once completed with this training, have your crew set up your air bags. If your agency doesnt have them, or you are at a station that does not have them try to set up some multi-company training to see how they are setup and used. The Objective of this session is to increase the users knowledge of the proper operation, use and care of the Holmatro HLB Lifting Bag System. If your agency utilizes a different brand you will need to look at the owners manual for that brands specific information. This Training session does not take the place of or supercede any training protocol required by your departments SOPs for performing rescue using these
systems. AIRBAGS How much weight can your air bag lift? What is the height that your airbag can lift?
In this picture is a Holmatro HLB 12 that is rated for lifting 26,970 LBS. The HLB 12 can lift 8.5 Can this air bag lift 26,970 LBS when fully inflated? LIMITATIONS AND CAPABILITIES The answer to the last question is no, it cannot lift its full weight when fully inflated.
The reason has to do with surface area. You need to figure the surface area and multiply that by the PSI that you are inflating to. The scientific name for this simple principle is: Pascals Principle
Pressure times area equals force. LIMITATIONS AND CAPABILITIES On the Holmatro lifting bags they operate at a maximum of 116PSI. This represents the P or pressure in the equation. LIMITATIONS AND CAPABILITIES
Surface Area This HLB-20 lifting bag measures 20.125 x 20.125 Surface area then equals 405 in sq. However the actual surface area is 19.54 in x 19.54 in or: 381.81 in This represents the A in the equation.
LIMITATIONS AND CAPABILITIES The reason the actual surface area is smaller then the first measurement is because: The construction of any brand of lifting bag is basically an envelope design Because this envelope is formed by the four sealed edges of the bag
The inflation area does not include the ENTIRE surface area of the bag. The actual surface area is the total minus whatever the small area of the edges equals LIMITATIONS AND CAPABILITIES
Lets Plug In The Numbers 381.81in x 116 psi = 44289.96 lbs. LIMITATIONS AND CAPABILITIES Next we must consider what happens when we introduce compressed air into the lifting bag
As the air volume increases the bag becomes more convex or rounded LIMITATIONS AND CAPABILITIES This gives us lift height and at the same time Reduces the surface area in contact with the object being lifted LIMITATIONS AND CAPABILITIES
So far we have looked at the available surface area of the bag and used that to calculate the maximum lift of the bag. In actual use what really matters is the contact area of the bag. Whatever the actual contact area is between the object being lifted and the surface of the bag determines how much can be lifted, and how high!
Contact Area: Is the total area (in) of the bag that comes in contact with the object to be lifted. LIMITATIONS AND CAPABILITIES LIMITATIONS AND CAPABILITIES LIMITATIONS AND CAPABILITIES LIMITATIONS AND CAPABILITIES
LIMITATIONS AND CAPABILITIES LIMITATIONS AND CAPABILITIES The higher the bag lifts an object the smaller the contact area becomes Therefore the higher we lift, the less weight we can lift
To maximize our lifting we must maximize contact area! Force on an object is created by the amount of contact area x the working pressure of the system. LIMITATIONS AND CAPABILITIES Holmatro HLB series bags are made of a specialized blend of rubber, reinforced by three Kevlar plies throughout the circumference.
To avoid stretching during use, the Kevlar is pre-stressed before being incorporated in the construction of the bag LIMITATIONS AND CAPABILITIES/CONSTRUCTION Dont exceed 116 psi/8 bar working pressure
Dont add weight to a lifted load Read operation manual before use Provide protection against sharp protrusions Crib as you lift
Do not stack more than 2 lifting bags. Place the larger bag on bottom Never place hard sharps protection on top of bag!! Only use soft protection which can be sacrificed, such as a truck mud flap, etc. LIMITATIONS AND CAPABILITIES Even though lifting bags are formulated of rubber compounds, they still offer a very broad operating range
For continuous use the temperature range is: -22F to 131F LIMITATIONS AND CAPABILITIES/TEMPERATURE RANGE All models have quick connect auto locking couplers on input and output ports
All models have built in factory set safety relief valves All controls have a dead man function LIMITATIONS AND CAPABILITIES/CONTROL UNIT Air hoses are constructed of polyurethane with a special reinforcing fiber weave
Special weave design allows push in fittings, making them field replaceable Couplers are automatic self-locking type To connect: push male nipple into female coupler
To disconnect, rotate silver collar 1/4 turn, and pull back on collar. LIMITATIONS AND CAPABILITIES/AIR HOSES Shut off hoses w/safety relief valve attach to lifting bag allowing over pressure protection to remain when disconnecting from control unit LIMITATIONS AND CAPABILITIES/SHUTOFF HOSES
Connection of the system should be accomplished quickly. Practice proper connection sequence to become familiar with all components. Connection Sequence When used with compressed air bottle
Connect the air hose between the bag and the control unit Connect shut off hoses now if needed during lift operation Connect the pressure regulator to the air bottle. Connect the air hose from the pressure regulator to the control unit. Open the compressed air bottle. The high pressure gauge, which is the gauge closest to the bottle, indicates the pressure in the bottle.
The other gauge shows the pressure that will flow to the lifting bag. Set the regulator so that the lifting bag pressure is 116 psi maximum. Place the lifting bag under the object to be lifted. The system is now ready for use. OPERATION Connect the air hose between the bag and the control unit
OPERATION Connect the pressure regulator to the air bottle. OPERATION Connect the air hose from the pressure regulator to the control unit. OPERATION
Open the compressed air bottle. The high pressure gauge, which is the gauge closest to the bottle, indicates the pressure in the bottle. OPERATION The other gauge shows the pressure that will flow to the lifting bag. Set the regulator so that the lifting bag pressure is 116 psi maximum.
OPERATION Place the lifting bag under the object to be lifted. The system is now ready for use OPERATION As with any rescue operation, safety of the rescuer and patients is the priority
Always exercise caution when performing lifting operations Always have plenty of cribbing material available to support the load AS IT IS BEING LIFTED. NEVER leave a load supported only by a lifting bag. OPERATION
Avoid placing yourself under an unstable load Never stack more than two (2) lifting bags Never place anything between 2 lifting bags Chock vehicle wheels before beginning any lifting operation
Follow all warnings on the lifting bag label and in the users manual Maintain a safe distance during lift If space permits, position yourself to the side of possible ejection path of lifting bags OPERATION/SAFETY
These bags have not been centered under the rocker channel This will lead to bags shifting position during inflation OPERATION/SAFETY These bags have shifted positionnotice the angle
They represent a potential ejection hazard OPERATION/SAFETY This operator should be to the side of the possible ejection path of the lifting bags OPERATION/SAFETY Locate lifting bag so that the centering mark is directly underneath the object to be
lifted. Remember to look for maximum contact area between bag and load when placing bag Protect the top of the bag against sharp objects by placing SOFT protection that can be sacrificed between bag and the load. (i.e. truck mud flap) NEVER place hard objects between load and top of bag surface
IMPORTANT! Be conscious of heat sources under vehicle, i.e. catalytic converter When there is not enough insertion space for bag placement you may need to use another device to create space OPERATION/PLACING AIR BAGS Sometimes the object being lifted is high above the lifting
surface (i.e. large vehicle, SUV, etc..) In this case you can build a box crib beneath the object Always place lifting bags on TOP of cribbing OPERATION/PLACING AIR BAGS Because the maximum height of any Holmatro lifting bag is 1
they are easily placed under loads with minimum clearance. Once lift is achieved, crib the load and continue If more lift height is needed, you can now introduce a second bag on top of the first When space permits and maximum lift height is desired, place both bags beneath load.
OPERATION Inflate the bottom bag FIRST Complete the lift by inflating the top bag Place cribbing to secure lifted object
OPERATION/STACKING BAGS With lifting bag system correctly connected and bags properly placed you can now begin the lift Using the controller, begin slowly inflating the bottom bag Place cribbing as the load begins to rise
Once an adequate height is reached secure the load with cribbing. Leave the bag inflated. If using shutoff hose, close quarter turn valve. Air supply hose may now be disconnected from lifting bag OPERATION/INFLATION SEQUENCE
Always deflate bags using the control unit Carefully remove cribbing. It may be necessary to slightly inflate lifting bags. If using two lifting bags, deflate in the opposite order of lift sequence: Deflate top bag first
Deflate bottom bag last OPERATION/DEFLATION SEQUENCE When completed place all items back in service and check for any defects. Again this presentation was specific to Holmatro, but same general principals apply. Get out there and Train! BACK IN SERVICE
This presentation put together by SCFD22 and information taken from Spokane County Fire District #4 thank you for the assist! THE END
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