38-WCN-Feb09:Layout 1 25/2/09 17:08 Page 1
WorldCargo
CARGO HANDLING
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normal 28mm hoist wires, while powerpack/tank and electro-mo- cover must be lifted by one spreader Productivity of the tandem lift
the power requirement of the tor because there was insufficient with the other empty without ex- is such that to keep pace with the
headblock and spreaders should be installed hydraulic power on the ceeding the maximum rope rating, crane, five straddle carriers are re-
25 kW. There are no hydraulic dummy. However, the spreaders despite being lifted by only two quired instead of the normal three.
power systems on the spreaders as are interchangeable throughout sheaves, while the other two sheaves This can place pressure on traffic
the power pack is mounted on the the terminal, as they can also be rotate but are not carrying any flow under the crane.
headblock and feeds each spreader supplied by the auto-connectors. weight except that of the spreader. The use of a tandem spreader
through two hydraulic lines by To switch to tandem opera- at the two Antwerp terminals has
auto connectors. tions when market conditions re- Auto-switching increased crane productivity by
The auto connection box also quire it, all that is necessary is to Additionally, it should be possible around 20%, somewhat less than
houses 20 x 30A electrical con- fit the SSH main body in place of to switch between tandem and theoretically possible. However,
nections and two mating pins are the frame. The hydraulic power single spreader operations auto- the terminal has not been de-
fitted to ensure correct alignment will be supplied from the SSH and matically with no manual inter- signed for this type of operation,
when switching the spreaders the SSH control system will be in- vention in the shortest possible and their use is seen very much as
from a single to tandem lift mode. tegrated into the crane’s main time. Stinis cites a figure of 135 a testing ground for other DPW
PLC. Additionally, it will be nec- secs to demount/attach the sec- and PSA operations as well. Ant-
Be prepared
Stinis Split Headblock (SSH) undergoing tests in Antwerp.
essary to fit more controls in the ond spreader, based on more than werp is a convenient test site as
By employing a standard hoist cabin and a touch screen monitor. six months operation of both pre- the workforce is highly skilled and it would be better to incorporate
reverts to normal operation. The
configuration, it is possible to pre- production models in Antwerp. communications between the ter- a system where the rotation of the
crane driver is also able to pre-se-
pare a crane for tandem lifts, as- One-sided The ability to undertake the minals and the Rotterdam-based sheaves generated hydraulic power
lect which flipper combination he
suming it meets the minimum The basic premise for tandem op- changeover fully automatically manufacturer are relatively easy. that could be stored in accumula-
considers suitable for the lift, while
hoist capacity, in stages. For a cus- erations taken by Stinis was that and controlled only by the crane The Kalmar cranes in Antwerp tors and backed up by a small elec-
the 150deg and 30deg positions
tomer in Germany, Stinis has pre- the crane should be capable of driver allows this process to be were also not intended for tandem tric power pack. However, this
can be set automatically.
pared a ZPMC crane for tandem handling not only two 40ft or four carried out on a platform, for in- operations, although it is thought subject is another debate in itself.
hoist where the SSH pulley block 20ft containers but a mixture of stance incorporated into the that the cranes at DPW Antwerp
Blocked vision
mountings and sheaves are fitted both as well as being to pick up a backreach of the crane. This frees Gateway could have been de- Free float
Operation of a tandem spreader
to a “dummy” frame that replaces 40ft or 2 x 20ft loaded containers up landside storage area below the signed with a view to be able to One problem faced by Stinis in
will always be more difficult for
the main SSH assembly. on one spreader with the other crane, or obviates the need for a test the Bromma tandem lift adhering to its flipper “spotting”
the crane driver. He is unable to
The Stinis Long-Twin spread- empty. This is a useful feature han- dedicated trailer on which to stow spreader design. philosophy is that in a twin
see all eight corner castings when
ers supplied meet the SSH speci- dling containers, but it is essential the spreader. spreader operation, with a fixed
lowering the container onto the
fication. They have a 45t SWL at for removing and replacing pon- While the SSH is able to lift 4 Flip the coin link between the two through the
deck or into the holds of a ship as
40ft, 41t at 45ft and 65t for 2 x toon hatch covers without hav- x 20ft containers (as can the dif- One feature of all Stinis spreaders SSH arms, the actions of one
his downward view is offset and
20ft operation. ing to dismount one spreader. ferent ZPMC, Bromma and RAM is a strong flipper action, which spreader will affect the position of
he is looking directly down to the
They were supplied with The full weight of the 40t approaches, assuming there is suf- the company believes can increase the other and the flippers of the
landside spreader.
ficient hoisting power), safety con- performance as much as, and two spreaders could effectively
To assist spotting and entering
siderations in some terminals can much less expensively, than higher work against each other.
a ship’s cells, the landside container
prevent it due to access consid- hoist speeds. The flippers on the To overcome this, during the
can be lowered some 20cm be-
The power to innovate
erations when deconing the in- SSH tandem spreader, for instance, final descent onto the container
low the waterside unit. This allows
ner corner castings. Accordingly, have 25 kW available and can each when the underside of the
the driver to guide the landside
it may be necessary to limit the generate a force of 7000 kN. spreader is around 1000mm above
container accurately. The water-
lift to 3 x 20ft containers, which Stinis explains that this is why the roof of the containers, the SSH
side container, which during the
imposes high eccentric loads on is it is not pursuing the market for system is allowed to “float” with
lift cycle has been shifted from
the spreader frames. all-electric ship-to-shore crane the hydraulic cylinders open and
1.5m apart to 2cm, can follow.
spreaders. It considers that elec- the flippers lowered to the 30deg
Stinis argues the case that the
Two into one trically-powered flipper actuators position. The flippers can there- cab should be repositioned, mov-
The split headblock, as the name are not sufficiently powerful, given fore spot the container and posi-
ing back landside some 1.5m to
suggests, comprises two 20ft the space limitations in which they tion the spreader above the cor-
2m, for better visibility during tan-
frames with a sheave at each end have to be mounted, or robust ner castings independently with
dem operations. This could require
and connected by two hydrauli- enough to accept high overload movements up to
a simple movement mounting sys-
± 500mm.
cally-actuated hinged arms that ratings caused by collisions, com- When the twistlocks are en-
tem under the trolley, for single
can also accommodate lateral pared to hydraulic actuators. gaged, the SSH hydraulic system
spreader operations. boxshadowdwn
moves. These allow the two frames, Both RAM and Bromma, on
in the open tandem position, to the other hand, argue not only that
Split headblock design in open position, made by ZPMC
act as one unit. At the same time their electric flippers have suffi-
it provides a flexible individual so- cient force, but also that all-elec-
lution to each spreader, opening tric spreaders bring other eco-
up to provide a 1.7m spacing be- nomic and environmental advan-
tween the containers. tages, due to the absence of hy-
The SSH, for instance, can ac- draulics and the lower tare weight.
commodate a 5deg “toe-out” an- Bromma reports that remov-
gle between the containers, and a ing the hydraulic system reduces
500mm length difference, as well spreader energy consumption by
as a 1.5m height difference. The around 90% as there is power on
NEW: Smart Safety System
latter feature is to be tested in demand rather than the power
Antwerp. One container will be pack idling, which consumes
for Long Travel Applications
grounded, to be picked up by a around 3 kWh. Over a 50,000h
straddle carrier, while the other spreader life cycle, this will amount
will be placed on a rolltrailer for to a saving of around 50,000 kWh.
KABELSCHLEPP Quality and Innovation:
immediate removal to reduce con- It could perhaps be argued that if
s� %LIMINATES�DAMAGES�TO�THE�CABLE�CARRIER�IF�BLOCKED�OR�
gestion under the crane. energy efficiency were paramount,
� IN�CONTACT�WITH�OBSTRUCTIONS�
s� $E�COUPLING�CARRIER�TOW�SYSTEM�PROVIDES�MAXIMUM�
� OPERATIONAL�SAFETY�
s� +EEP�REPAIR�COSTS�AT�A�MINIMUM
s� -INIMISED�DOWN�TIME�n�REDUCED�MAINTENANCE�COST�
s� %ASY�RE
COUPLING�AFTER�EMERGENCY�STOPS
s� #OVERING�TRAVEL�MOMENTUM�ON�EMERGENCY�
� SHUTDOWN�AND�BRAKING�
s� %MERGENCY�SYSTEM�INDEPENDENT�OF�TRAVEL�DIRECTION
TOC
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AL
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38 February 2009
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