CARGO HANDLING
WorldCargo
news
New cable for high speed cranes
Tratos Cavi SpA, the Arezzo, Italy-
Today’s ASCs and other high speed RMGs demand a
based cables manufacturer, has
come up with a new cable design
new type of cable, says one cable specialist.
for high-speed long travel appli-
cations on RMGs.
Otherwise crane operators are running a big risk
Experience tells us, says the
company, that the most com- commodate the demands of high compounds, Tratos has added canising phases (ie the insulated
mon problem is twisting. The speed applications. some chemical components to core vulcanisation and the sheath-
faster the reeling speed, the a71 Every component should be increase their insulating charac- ing vulcanisation) are carried out
greater the risk, as higher speeds tested, in all aspects, by modern teristics and improve the vulcan- in very long vulcanising pipes,
Results of tensile tests on the new Tratosflex cable and other cables
result in increased tension and instruments, to guarantee suitabil- ising properties. with much higher than normal
torsion and forces all the ele- ity for the new cable construction. a71 Sheathing compounds: In this temperature and pressure. high performance materials, very norms, but Tratos has added more
ments that make up the cable - a71 Factories should have better test- case, too, Tratos has added specific As a result, says Tratos, it has accurate workmanship and care- tests in order to verify the addi-
power/earth cores, inner sheath, ing equipment in order to simu- products to achieve its desired re- obtained a compact cable that has ful production,” says Tratos. tional measures decided on dur-
outer sheath and anti-torsional late the expected working condi- sults in the sheathing process. been proven in the various differ- “The control is continuous ing production.
protection - to move against tions of a complete cable. a71 Cable reinforcement: A consid- ent conditions of the cable reels from when we first draw the cop- The new EDSB cable is suit-
one another. erable amount of Kevlar has been on the high speed automated per wires until we hand the fin- able for speeds of up to 300 m/
The relative motion makes the
Tightening up used in different cable locations in stacking cranes at the Euromax ished cable to the test engineers.” min with a one way monospiral
cores elongate unevenly duing Tratos’ solution is to tighten the order to have the maximum pos- terminal in Rotterdam. All the cable characteristics are reel and 200 m/min in a two way
bending and conductors on the structure against relative internal sible support during cable pulling. tested according to the VDE “turnover” application. a74
outer layer of a strand can easily movement so that, in operation,
Good performersa71 Conductors and optical fibres
be broken. all the cable elements work as a lay-up: This phase of the cable is This application has now been
Maximum tensile load (N)
solid whole. the result of years of experiments going for a year and, according to
Sharp damage
Cross section Tratosflex FO Tratosflex FO ES3
This type of cable, designated in the factory and in the field. The Tratos, improvements made in the ESDB, 6/10kV(common design) 6/10kV
As the conductors are sharp, they Tratosflex FO ESDB, is character- cable pitch now being used in lay- cable reels have not affected or
permanent/dynamic permanent/dynamic
can damage the original inner ised by a higher maximum tensile ing up the conductors is state-of- changed the good performance of
3x25+2x25/2+6FO 3000/4125 1500/2250
structure. The semi-conductor and load than more common cables, the-art, to arrive at a very com- the cables.
3x35+2x25/2+6FO 3000/4125 2100/3150
insulation layers are produced to but with similar weight and outer pact, but still very flexible cable “We consider that the success-
3x50+2x25/2+6FO 3600/5250 3000/4500
VDE standards and any change in diameter. The table compares suitable for reeling applications. ful cable operations are the result
3x70+2x35/2+6FO 5000/7500 4200/5250
3x95+2x50/2+6FO 6500/8900 5700/7000
them may cause a short circuit or Tratosflex FO ESDB with a com- a71 Vulcanising: The successive vul- of a combination of our use of
even an explosion. mon reeling cable, Tratosflex FO
In addition, once conductors ES3, while the diagram shows ten-
are broken, the cable is carrying sile load against elongation for
the same electrical power with a ESDB and other cables.
shorter cross-section. For exam- Tratos points out that interna-
ple, a cable of 3x25+3x10 with tional standards (in its case VDE)
broken conductors may function give indications concerning the
as a cable of 3x20+3x8. basic requirements, and leave am-
In this case electric power ple margins for cable makers.
Increase life with
overloads can cause explosion at Specifically, Tratos has made
any position along the cable at improvements to the following ca-
random. People can never predict ble details.
that an accident will occur at a a71 Copper conductors: The com-
given position on the cable. pany is using small diameter wires
In order to eliminate the prob- and the same wires are used for
lems, continues Tratos, three things both phase and earth conductors.
must be achieved. Tinned phase conductors are used
for added flexibility.a71 Engineers, using their experi-
ence and expertise, should modify a71 Insulating compounds: As well
the cable’s internal design to ac- as producing VDE-compliant
MOL adopts “Hawkeye”
Mitsui OSK Lines Ltd (MOL) has comparisons are offered with la-
adopted the “Hawkeye” crane ser-based anti-collision systems.
anti-collision system on RTGs at License application for a radio
its Tokyo International Container frequency is not needed when
Terminal (TICT) located at Ohi installing Hawkeye, says MOL,
Pier in the Port of Tokyo. becuase it conforms to the 24GHz
The system was first tested by band specified low power radio
TICT together with other MOL certification.
affiliates, International Container MOL plans to roll out
Terminal Co Ltd and Terminal Hawkeye at all its container ter-
Engineering Co Ltd. minals worldwide as part of on-
E-ChainSystems.
®
Hawkeye is a microwave-based going group-wide efforts to en-
sensor system developed by a hance the safety and reliability of
MOL subsidiary, Nihon Engi- container handling operations.
neering Co Ltd, in collaboration Microwaves are radio waves
Lower cost and longer life have been achieved with igus
®
E-ChainSystems
®
for all kinds of Ship-to-
with New Japan Radio Co Ltd categorised by specific wave-
shore cranes. Over 350 times worldwide. What's next? New generations of polymer E-Chains
®
,
and Palgiken Co Ltd. (Up to now lengths. They tend to travel in a
Nihon Engineering has specialised straight line in open areas, because
Chainflex
®
cables – from fibre optical to 6/10 kV cables – and accessories for faster, longer, yet more
in providing inspection and main- of their short wavelength, and will
reliable cranes. Plus a standard Condition Monitoring System. Reduce your costs, increase service life.
tenance and repair services for reflect off of any metal obstacle in
reefer containers). their path.
The developers have applied The job of the sensor array set
for patents. MOL claims that mi- in the upper gantry parts of the
crowave sensors are less suscepti- RTG/RMG is to prevent colli-
ble to ambient conditions than sions between the crane and the
radar or ultrasonic sensors and can stacks or truck in the truck lane.
measure distance more reliably, The sensors in the lower part of
without regard to shapes of ob- the crane, on the portal beams and
jects, because the microwaves on the outside and end of the
cover a larger area than radar and bogies prevent collisions between
can measure longer distances than cranes and between cranes and
... with lattice girder ... with double trolleys ... with rope driven trolley ... with double girder
radar and ultrasonic sensors. No vehicles or other objects. a74
MOL says it will fit Hawkeye to yard cranes at all its terminals worldwide
plastics for longer life
®
®
-cranes.com
igus
®
GmbH Spicher Str. 1a D-51147 Cologne phone +49-2203-9649-0 fax +49-2203-9649-222 cranes@igus.com
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March 2009 27
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