CHINA NAVIGATION0 pages

COMMERCIAL MARINE SMART TECHNOLOGY CM-1000 CASE STUDY

China Navigation

New cargo vessels carry added green advantage – sea water cooling
systems designed to save energy.

PROBLEM
A commitment to building green, sustainable vessels that
save energy and perform efficiently was at the forefront of
China Navigation Company’s plans for eight new 31,000
deadweight “S” Class multipurpose vessels scheduled
to launch in 2013. China Navigation is the deep sea ship
owning arm of the multinational Swire group.
The Zhejiang Ouhua Shipyard, Zhoushan, China, is
building all of the vessels. Designed for containers,
breakbulk and bulk cargo, the first of the vessels, the MV
Shansi, launched in mid-April. The innovative vessels
will be part of Swire Shipping’s multipurpose liner trade
that link north, east and southeast Asia to key markets in
Australia, New Zealand and island nations of the South
Pacific. The new “S” Class vessels are designed for high
speed cargo handling and the versatility to carry a wide
range of cargo types.
China Navigation has codified its vision for a sustainable
future, with operational excellence as the guiding
principle. The vision is to be the leading provider of
sustainable shipping solutions and to be the customer
partner of choice. China Navigation adheres to the
industry’s 2001 Sustainable Shipping Initiative, a shared
vision for the industry to contribute to and thrive in a
sustainable future.
New building is a part of that commitment to
sustainability. The new “S” Class vessels are designed
for best-in-class environmental initiatives, including fuel
efficiency and emission reduction to deliver the lowest
carbon footprint possible from operations. All areas of the
ships have been designed to achieve energy savings and
reliability. A long list of examples includes:
R
eusing exhaust gases from the main engine and
generators to make steam to heat the fuel

SOLUTION
SEA WATER COOLING SYSTEM – CRITICAL COMPONENT
WITH HUGE ENERGY SAVINGS POTENTIAL
One specific area identified for energy savings as well as
operational and maintenance savings was the sea water cooling
system. Controlled by centrifugal pumps and AC motors, the sea
water cooling system is a key component on vessels. The system
pumps ambient sea water into a circulating loop. This loop
provides a heat exchange with the vessel’s freshwater cooling
system, which works to cool shipboard energy consumers that
include the main engines, generators and auxiliary equipment.
Once the sea water has taken on heat from the fresh water, it
is pumped back into the ocean as cooler ambient sea water is
drawn in and introduced to the system.
The sea water cooling pumps on the new “S” Class vessels are
arranged in a 2 x 100% configuration, which means that one
pump is always active and, in a traditional system, would operate
at 100% flow. The second pump is redundant.

H
ull form that combines high cargo
capacity and low fuel consumption
W
ake ducts to improve fuel efficiency cargo cranes that
utilize 40 to 50 percent power of traditional cranes

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REDEFINING WHAT’S POSSIBLE

4/30/13 10:19 AM