Home' Work Boat World : November 2015 Contents Recently delivered to NYK by Keihin
Dock Co. from their Oppama Plant close
to the mouth of Tokyo Bay, is the
‘Sakigake’, the first LNG fueled small
ship built in Japan.
Although Japan has been building LNG
carriers that utilise boil off of their cargo for
fuel for many years, this is the first
Japanese built, non-LNG carrier to be
installed with engines capable of using
natural gas as a fuel.
She is the second “environmentally
friendly” tug that NYK has commissioned,
the first being the 2013 built ‘Tsubasa’
which was a combined diesel and battery
powered hybrid, capable of operating with
20 percent lower CO2 emissions than
comparable purely diesel powered tugs.
Like the ‘Tsubasa’ before her, ‘Sakigake’ will
be operated by Wing Maritime Service
Corporation at Yokohama Port.
As permanent LNG bunkering services
aren’t yet common place, ‘Sakigake’ is
presently being fueled from tanker truck,
identical to those that deliver LNG to end
users world-wide. The LNG is stored in
liquid form in a pair of tanks just forward of
mid-ship and undergoes heating and
vapourisation to convert the fuel from liquid
to gas so it can be used in the engines.
The pair of Niigata 6L28AHX-DF
engines that provide power are the first of
the model to be installed and are host to a
number of improveme nts in the duel-fuel
engine market. Gas engines have
historically being underpowered
compared to their diesel or HFO siblings
and have struggled with rapid power
changes and low acceleration.
Niigata claims that the 28AHX-DF
family has the same load increase rate
whether on gas or diesel and that, in
another first, fuel type can be changed
even at full engine load. The engine has
been designed to be started with gas and
operated throughout the entire power
r ange without needing to change fuel.
Uncontained boil-off of LNG when the
engines aren’t in use is planned for with a
pair of buffer tanks and in the event of
seals not holding, numerous gas detection
systems are fitted throughout the vessel.
For the ‘Sakigake’ installation, the
designers have selected a moderate de-rating
of the Niigata engines from 1,920kW per
engine to 1,618kW each and an rpm drop
fro m 800min-1 to 750min-1 compared to
the factory standard. Still sufficient power to
reach a maximum speed of 14 knots and
also capable of generating towing forces of
55 tonnes ahead and 50 tonnes astern.
A pair of Niigata shrouded Z-Peller
azimuthing propellers provide the full 360̊
manoeuvrability that a harbour tug
requires. Coming with CP props as
standard, the ZP-31’s will give the
‘Sakigake’ traction in all conditions. A
single fire monitor rounds out the
equipment installed on the ‘Sakigake’
enabling her to assist should disaster strike
an unfortunate vessel.
Although construction was subsidised
by Japan’s Ministry of Economy, Trade
and Industry and Japan’s Ministry of
Land, Infrastructure, Transport and
Tourism, NYK should be commended for
investing in new ideas that will have
benefits that are not only environmental,
but undoubtedly also financial.
An interesting experiment nonetheless
that will undoubtedly be watched closely.
Perhaps we’ll see a few more of ‘Sakigake’s’
sisters out on the water in the future.
Type of Vessel:
Port of registry:
NYK Line, Japan
Wing Maritime Service
Keihin Dock Co., Japan
2 x Niigata 6L28AHX-DF,
2 x Niigata ZP-31
40 November 2015 WORK BOAT WORLD
FOCUS ON TUGS
JAPAN’S FIRST LNG-FUELLED WORK BOAT
40 VR KEIHN:Layout 1 14/10/15 2:27 PM Page 40
Links Archive October 2015 December 2015 Navigation Previous Page Next Page