120511 Lashing_Seminar_Uni-Lubljana-Part 1 (1)
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Transcript of 120511 Lashing_Seminar_Uni-Lubljana-Part 1 (1)
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Seminar Container Securing on Container Vessels
Part 1
May 11, 2012 Portoroz
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Why pay keen attention to container securing?
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Forces acting on container stack
Wind load (only for wind exposed container on deck).
Acceleration caused by vessel movement at sea.
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Forces acting on container stack
Wind load for exposed container on deck
. .
20 Container 40 Container
.
2nd. tier 15 kN 30 kN
1st. tier 30 kN 60 kN
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Forces acting on container stack
Transverse acceleration bq
1,001,00
bqbq
. .
0,90
0,95
0,90
0,95
transverse acceleration bq on 0,75
0,80
, 5
0,75
0,80
, 5
,
0,65
0,70
0,65
0,70
transverse acc. bq belowweather deck GM=1,52m
0,50
0,55
,
0,50
0,55
,
, , , ,
distance from AP
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Resulting forces applied to container
Racking force A
Transverse force a lied to container end and door frames.
=> Can be reduced by using diagonal lashing elements.
Liftin force B
Vertical tension force applied to container corners, absorbed
by Twistlocks.
=
A
elements.
Post load CCD
Vertical compression force applied to container posts.
=> Container weights have to be reduced.
Lashing load D
Load in the lashing element.
= an e re uce y us ng a ona agona as ng
elements.
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Forces acting on container stack
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Permissible resulting forces on container
GL LR BV ABS DNV
ac ng orce
Lifting force 250 kN 250 kN 250 kN 250 kN 250 kN
Post load 848 kN 848 kN 848 kN 848 kN 864 kN
Lashing load
- Long lashing- Short lashing
245 kN230 kN
245 kN230 kN
245 kN230 kN
245 kN230 kN
245 kN230 kN
lashing angle)
Red values => working load = proof load!
Values valid for 20`/40` container acc. ISO 1496-1, 1990.
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Typical Container AccidentsTypical Container Accidents
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Typical container damages
Excessive racking forces
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Typical container damages
Excessive post load
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Typical container damages
Excessive lifting forces
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Typical container damages
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Certification of container securing equipment
Type Approval Certificate
No connection to one specific project.
Available for standard products.
Class batch test for 2-3 % of each product
of a shi set u to defined roof load.
Valid for limited period of time (4-5 years).
For project specific equipment design. Class batch test for several peaces of
breaking load.
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Cargo Securing Manual
Class approved document required for all container vessels with class
notation. Has to be ke t on board!
Vessel specific. Following class and IMO rules and regulations.
Provides stowage and securing instructions for each container bay / stack:
Principal stowage pattern
Princi al lashin attern
Vertical weight distribution Permissible stack weights
-.
Includes material list and class certificates for all container securing
.
Contains handling and maintenance instructions for securing devices.
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Cargo Securing Manual
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Cargo Securing Manual
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Calculation examples
6.0
Mass shifting30.5
6.0
12.0 12.09.5
.
13.0
.
13.0
.
16.0
16.0 16.020.0
.
30.5
120 t 120 t
.
30.5
120 t
.
30.5
Tier Approved
stowage
Proper deviating
stowage
Permissible
value
Improper deviating
stowage
overload
Racking force 4 99 kN 90 kN 150 kN 166 kN X
Lifting force 1 239 kN 217 kN 250 kN 583 kN X
Post load 1 846 kN 826 kN 848 kN 1235 kN X
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Calculation examples
Wrong lashing 6.0 6.0
6.0
12.0 12.0 12.0
.
13.0
.
13.0
.
13.0
16.0 16.0 16.0
120 t
.
30.5
120 t
.
30.5
120 t
.
30.5
Tier Approved
stowage
Permissible
value
Improper deviating
stowage 1
Improper deviating
stowage 2
overload
Racking force 4 99 kN 150 kN 99 / 154 kN (tier 1) 99 kN X /
Lifting force 1 239 kN 250 kN 339 kN 187 kN X /
Post load 1 846 kN 848 kN 847 kN 852 kN / X
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Calculation examples
Additional wind force6.0
6.0
12.0 12.0
.
13.0
.
13.0
16.0 16.0
120 t
.
30.5
120 t
.
30.5
Tier Approved
stowage
Permissible
value
Improper deviating
stowage
overload
Racking force 4 99 kN 150 kN 151 kN X
Lifting force 1 239 kN 250 kN 508 kN X
Post load 1 846 kN 848 kN 1148 kN X
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Calculation examples
Empty container 3.5 3.5
3.5 3.5
.
4.0
.
3.5
10.0 3.5
85.5 t
.
30.5
24.5 t
.
3.5
Tier Approved
stowage
Permissible
value
Improper deviating
stowage
overload
Racking force 1 134 kN 150 kN 63 kN
Lifting force 1 250 kN 250 kN 340 kN X
Post load 1 714 kN 848 kN 638 kN
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Calculation examples
Additional Bridge Fittings
3.5
3.5
6.5
6.5
3.5
3.5
6.5
6.5
5.0
12.0
15.0
24.0
5.0
12.0
15.0
24.0
30.5 24.0 30.5 24.0
85.0 t
30.5 24.0
100.0 t 85.0 t
30.5 24.0
100.0 t
er pprove s owage w ou
Bridge Fittings
erm ss e
Value
mproper ev a ng s owage
with Bridge Fittings
over oa
Outmost stack Inner stack Outmost stack Inner stack
Lifting force 1 250 kN 250 kN 250 kN 224 kN 263 kN X
Post load 1 832 kN 840 kN 848 kN 812 kN 850 kN X
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Inspection & maintenance
Visual inspection of complete container securing equipment at fixed
. .
Inspection and maintenance actions should be documented in the Cargo
Securin Manual record-book.
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Contact
,
German Lashing Robert Bck GmbH
Markus Theuerholz
Marcusallee 9 D-28359 Bremen Germany
on: - - - ax: - - -
E-Mail: [email protected]
Internet: www.germanlashing.de
