dunnage bag in cargo load securing - wordpress.com · 2009-10-26 · what is a dunnage bag? it is a...
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Dunnage Bag In Cargo Load Dunnage Bag In Cargo Load SecuringSecuring
Cejipac Sdn. Bhd.
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Why secure the cargo loads?Why secure the cargo loads?
The sea can be rough!
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Why secure the cargo loads?Why secure the cargo loads?
The goods can fall out !
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Why secure cargo loads?Why secure cargo loads?
Damaged goods and properties can be expensive!
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Why secure the cargo loads?Why secure the cargo loads?
Can cause accident!
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Why secure cargo loads?Why secure cargo loads?
Can damage the container!
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Why secure the cargo loads?Why secure the cargo loads?
Can cause public nuisance!
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Common excuses givenCommon 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 Introduction
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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ConstructionConstruction
A polyethylene bladder with a polyethylene valve
To give strength , the bladder is wrapped in one or multiple ply of kraft paper, vinyl , nylon or woven polyethylene sheet.
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PurposePurpose
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? How does it work?
• Adapt to any shape, space or void
• Absorb vibration• Exert constant
pressure • Cushion
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Working Pressure Working Pressure
Level Fabric Denier Working Pressure .kPa
1 900
20
2 1000 40
3 1600 60
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ForcesForces
Given Bag: 90 x 180 cm , 1000D Contact Area , 80% : 72 x 144cm =1.04m2 Force = Pressure x Area Force = Working Pressure x Contact Area Force = 40kPa x 1.04m2 Force = 41.6 kN Force = 41.6 /9.81m/s2 = 4.2 tonne
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Typical Forces (Tonne)Typical Forces (Tonne)DUNNAGE BAG FORCES
0123456789
10
5 10 15 20 25 30 35 40
VOID SIZE -CM
FO
RC
E -
TO
NN
E 90 X 120Paper,2-ply90 X 180Paper,2-ply90 X 220Paper,2-ply90 X 120WPP,1000D90 X 180WPP,1000D90 X 220WPP,1000D90 x 180WPP,1600D
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Loading PlanLoading Plan• Have out a loading plan
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How To Install The Bag?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
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Situation To Avoid #1Situation To Avoid #1
Using too big a bag
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Situation To Avoid #2Situation To Avoid #2
Using too small a bagTILTING
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Situation To Avoid #3Situation To Avoid #3
Too big a void
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Situation To Avoid #4Situation To Avoid #4
Never use two bags together
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Situation To Avoid #5Situation To Avoid #5
Do not place a bag next to the door
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Situation To Avoid #6Situation To Avoid #6
Do not under-inflate
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Situation To Avoid #7Situation To Avoid #7
Do not over-inflate the bag Signs of over-inflation :
1. Cargo shape is distorted2. Container walls are bulging
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Situation To Avoid #8Situation To Avoid #8
Using an inflation tool with a sharp tip- puncture the plastic bladder
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Situation To Avoid #9Situation 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 How to correctly inflate the bag?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?How many bags are needed?
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.