Dunnage Bag In Cargo Load Securing Cejipac Sdn. Bhd.
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Why secure the cargo loads? ď Ź
The sea can be rough!
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Why secure the cargo loads? ď Ź
The goods can fall out !
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Why secure cargo loads? ď Ź
Damaged goods and properties can be expensive!
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Why secure the cargo loads? ď Ź
Can cause accident!
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Why secure cargo loads? ď Ź
Can damage the container!
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Why secure the cargo loads? ď Ź
Can cause public nuisance!
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Common excuses given “It’s so heavy, it won’t shift” “We thought it will be strong enough” “We have no time to secure the cargo during loading” “We have been doing this for 20 years and nothing like this has ever happened before”
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Introduction ď Ź
What is a dunnage bag? It is a bag filled with air and used to restrain loads in rail cars, trucks and containers.It is also used to fill voids between articles of cargo to prevent shifting during transit.
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Construction A polyethylene bladder with a polyethylene valve ď Ź To give strength , the bladder is wrapped in one or multiple ply of kraft paper, vinyl , nylon or woven polypropylene sheet. ď Ź
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Purpose ď Ź
To fill voids , brace loads,restrain loads, absorb vibration and cushion the loads from in-transit damage.
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How does it work? • • • •
Adapt to any shape, space or void Absorb vibration Exert constant pressure Cushion
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Working Pressure Level
Fabric Denier
Working Pressure .kPa
1
800
20
2
1000
40
3
1600
60
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Forces Given Bag: 90 x 180 cm , 800D Contact Area , 80% : 72 x 144cm =1.04m2 Force = Pressure x Area Force = Working Pressure x Contact Area Force = 20kPa x 1.04m2 Force = 20.8 kN Force = 20.8 /9.81m/s2 = 2.1 tonne
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Typical Forces (Tonne) Dunnage Bag Forces 10.00 9.00 8.00
Force, tonne
7.00
90 x 180,L1 90x 120, L2 90 x 180, L2 90 x 220, L2 90 x 180,L3
6.00 5.00 4.00 3.00 2.00 1.00 0.00 5
10
15
20
25
30
35
40
Void Size,cm
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Loading Plan •
Have out a loading plan
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How To Install The Bag?
Step 1:Choose the right size for maximum contact Step 2:Protect the bag from sharp objects Step 3:Position the bag correctly Step 4:Inflate the bag till the cargo is properly secured www.cejipac.com
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Situation To Avoid #1 ď Ź
Using too big a bag
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Situation To Avoid #2 ď Ź
Using too small a bag TILTING
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Situation To Avoid #3 ď Ź
Too big a void
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Situation To Avoid #4 ď Ź
Never use two bags together
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Situation To Avoid #5 ď Ź
Do not place a bag next to the door
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Situation To Avoid #6 ď Ź
Do not under-inflate
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Situation To Avoid #7 Do not over-inflate the bag ď Ź Signs of over-inflation : 1. Cargo shape is distorted 2. Container walls are bulging ď Ź
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Situation To Avoid #8 ď Ź
Using an inflation tool with a sharp tip - puncture the plastic bladder
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Situation To Avoid #9 Ensure the bag is not exposed to any sharp edges eg. edges of pallet, tins & nails etc. Sandwich the bag between 2 pieces of cardboard before inflation.
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How to correctly inflate the bag?
Use a regulated air supply set at the recommended pressure Give a few quick burst of air to open up the bladder before filling Check that the load being secured cannot be moved and is not distorted Observe that the container walls are just beginning to buckle Stop inflation,tighten the valve cap and insert the plug
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How many bags are needed? ď Ź
According to the US FMCSA rules, the aggregate working load limit of any securement system used must be at least one-half the weight of the load.
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