[WRE ADVISOR | BUSINESS] Kalmar’s ship to shore cranes
“In general, cable development has kept pace with
overall crane development, although in some areas - ‘intelligent cables’ for example - we are still very much at the beginning. Also, in ground material, we are still looking at rubber/copper, polyurethane/copper or those with fibre optic solutions. However, very little at the moment is new in terms of groundbreaking news for compounds or transmitting material,” she says. Handling heavier loads is certainly a challenge for
the future. Increasing the number of containers on one lift is already a reality with tandem and twin-lift solutions and the extra load that puts on cables. In respect of dual-hoist or double-trolley spreaders,
Tratos export director Maurizio Bragagni says there are no real problems in producing good quality cable to handle these, because the number of the conductors is the same
and, consequently, the weight and self-supporting forces don’t change significantly. “However, you do get a problem when, instead of
a group of conductors, an optical cable is inserted, for example, which becomes an effective weak point. You must take extra measures to reinforce such cable,” he says. Ms Schliessmann says, at least mechanically,
preparing cable to handle heavier loads means only that the sheath materials, support element materials must be of higher quality, although some cable concepts possibly need to be reconsidered. Nevertheless, in her opinion, none of this represents “drastic” change. Te tendency in flexible copper cable, she maintains, is for it to get lighter, although this presents manufacturers with the challenge of finding “smaller” cables capable of transmitting higher currents and/or data rates, whilst not increasing the weight/strains on the crane. y
Reprinted with permission:
www.portstrategy.com http://www.portstrategy.com/features101/port-operations/cargo-handling/cables-and-reels/cables
74 NOVEMBER-DECEMBER 2011 WIRE ROPE EXCHANGE
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