MARITIME

Cimolai Technology SpA is an Italian-based company that specializes in the design, fabrication
and installation of special lifting and transporting equipment for marinas, ports
and shipyards.
Its fl agships are:
- The biggest boat hoist in the world, lifting capacity 1100 ton., at work in Qatar
- Ten boat hoists capacity 820 ton., with an additional two units due for delivery by
end of 2015
- Two shipyard cranes on tyres, capacity 1000 ton. each
ECO Retrofit Service
Contact information
E-mail: info@cimolaitechnology.com
Website: www.cimolaitechnology.com
Telephone: +39 049 9404539
Making Bulbous Bow Optimizations Future-proof
Ship owners and operators are turning
to bulbous bow retrofits to
increase their vessels’ energy efficiency.
DNV GL has developed a tool
as part of the ECO Retrofit service to
support the industry in tailoring retrofit
projects to the future needs of their fleet.
While the service identifies new bow
shapes based on computational fluid
dynamics (CFD) calculations, the new
tool explores the effect of alternative operational
options. Overall, this approach
can help customers help save 5-10% on
their annual fuel bill. The biggest issue
in many retrofit projects is the definition
of the individual operational profile. In
the past two years the ECO Retrofit service
has already helped to upgrade some
200 vessels. Aside from analyzing their
fleet’s past performance, ship owners
and operators frequently have questions
concerning the future, such as: What if
I operate at other conditions some day?
Can we change the operational profile
again? “Even though our new ECO Retrofit
tool cannot change the volatility of
the market, it quantifies performance for
a bandwidth of scenarios from worstcase
to best-case scenarios, supporting
more informed business decisions,” said
Carsten Hahn, Senior Project Engineer
ECO Lines at DNV GL – Maritime.
DNV GL’s new ECO Retrofit service
creates 5,000 to 10,000 vessel-specific
bow designs and assesses them for a
broad range of operational conditions using
CFD. An interactive excel-based tool
allows easy and immediate exploration
of “what-if” scenarios for changing operational
conditions. The input is drawn
from the target operational profile and is
typically displayed in a matrix of four
speeds and three drafts. Optional constraints,
such as reaching design speed at
85 percent engine power, are also considered
before the best bow shape for
the operational profile is chosen. The
tool can then assess the performance of
this bow for alternative operational profiles.
It displays estimated savings (in $
per year and amount of power in %) and
payback time of the best bulbous bow
option for all specified operational profiles.
The payback time calculation takes
aspects like fleet size, conversion costs
and fuel price into account. Should customers
want to change any elements of
the analysis the tool simply recalibrates
the new input to create more what-ifscenarios.
LNG Bunker Barge Concepts
Jensen Maritime Consultants debuted a pair of LNG bunker barge concepts. The
first concept involves outfitting an existing barge with an above-deck LNG tank. The
concept can be further modified to accommodate more than one type of product, if
a customer has a need for multiple liquid transfers. Design advantages include a
fast turnaround and a reduced need to invest in specialized assets if a customer has
short-term LNG requirements. The second concept is for a purpose-built, new bunker
barge. Offering greater carrying capacity and improved visibility, the design features
a larger LNG tank that is nestled inside of the barge. This new barge will also feature
the latest safety features and efficiencies. As the maritime industry continues to
evaluate the pros and cons of switching to LNG or dual fuel options, bunker barges
offer a solution for the maritime industry, which is currently struggling with the decision
over which to develop first – LNG infrastructure or vessels. These barges are a
resource for those who have LNG needs at ports not located near an LNG terminal or
as an alternative to over-the-road transportation.
www.jensenmaritime.com
Jensen
www.marinelink.com 63