High berth productivity - what’s the point?
How can shipping lines reconcile slow speed steaming with demands for fast ship turnaround at the berth?
The question was asked by UK-based port consultant Budha
Majumdar, speaking at this week’s Portcentric Logistics conference in
Manchester, organised by Navigate Events.
Majumdar takes the
view that the most wasteful activities in container terminals are truck
waiting times (queues, unproductive box shuffling, “lost” boxes) and -
signalling a sea change in conventional thinking about terminal
efficiency - “overproductive” berths.
“I am not saying it is
wrong to have an average of five cranes each averaging 30 moves an hour
over an 8000 TEU ship," said Majumdar, "but we need to be sure it is
really needed when the ship is operating on a super slow speed
schedule.
“A shipping line might say that it needs fast
turnaround in order to maintain the integrity of the slow speed
schedule, but let’s at least discuss it with them.”
Apart from
the energy cost on the quay, the quicker the ship’s moves are exchanged
the more likely are errors in the buffer stocks and that aggravates the
problems of unproductive shuffling and “lost” boxes in the yard,
leading to excess use of handling equipment, wasteful truck queues,
etc.
Majumdar suggested that it may be appropriate for a
terminal to have, say, a three crane availability standard guaranteed
at 25 moves/crane hour.
If the customer wants more, he pays for
it. If, on the other hand, the terminal operator needs to hurry the
ship through, he pays for it.
Analysts estimate that slow speed
scheduling, aimed at fuel savings and reducing overcapacity, has added
5-7 days to east-west supply chains.
The fuel savings are huge.
Lloyd’s Register (LR) has estimated that for a large container ship at
70,000 kW main engine power, reducing speed from 25 to 20 knots (20%
slower) would require just 50% power. Allowing for the longer voyage
time, the fuel saving would be around 40%.
From a technical
standpoint, LR also warned that operating ships for long periods
outside their “design envelope” could be piling up problems for the
machinery.
All the same, slow steaming looks set to stay for
some time, even though container trades are recovering. Speaking last
December Jesper Kjaedegaard, a former Maersk CEO and the current
president of the International Chamber of Shipping, forecast that
overcapacity would last until 2013, despite all the vessel lay-ups and
slow speed regimes.
In this context, Majumdar’s case could be
very important, particularly in the overall supply chain context: what
counts is the speed the box moves through the terminal, not how fast it
comes off the ship.
Source :World Cargo News