In a rare case of a Japanese shipbuilding
contract being placed overseas Japanese telecom group KDDI has placed an order for
the Colombo Dockyard to build a one-hundred-and-eleven-meter cable layer.
Japanese telecom group KDDI is anticipating the
development of offshore wind farms with the order of a vessel equipped not only
for fibre optic cable installation and repair but also for laying subsea power
lines, according to Sri Lankan Media reports. This is seen as part of Tokyo’s
move to retrieve Colombo from the clutches of China.
In terms of contract value and vessel length, the
project is the largest ever undertaken by the Colombo Dockyard, which has had a
Japanese Operational connection by way of the tactical collaboration maintained
with Onomichi Dockyard since 1993.
The completion of the vessel is due by the end of
March 2019; it will be deployed by KDDI’s wholly-owned subsidiary Kokusai Cable
Ship Co (KCS). The new build scheme draws on specialized areas of foreign
expertise, engaging Vard Design of Norway for ship design, Vienna Model Basin
of Austria for tank tests, and the UK Company MAATS Tech for the 2,000t under deck
cable carousel and spooling system.
Since its establishment in 1966, KCS has deployed
cable layers for use in building and maintaining the optical submarine cable
network across the Asia Pacific region. Two vessels are currently in service,
the 133m KDDI Ocean Link and 109m KDDI Pacific Link, dating from 1992 and 1993,
The new ship will be the first in the Japanese
fleet capable of power transmission cable installation in addition to the
primary task of supporting work with telecoms cables. Furthermore, improvements
in endurance and speed relative to the previous ships will confer a global,
rather than simply a regional, operational capability. The nature of the hull
form, thruster propulsion system and use of passive roll reduction tanks are
intended to enhance sea keeping performance, directional stability and position
holding in all conditions, extending the operating window for precision work.
The heart of the diesel-electric power and
propulsion plant will be four generator sets of 2,250kW apiece, and a DP2
standard of dynamic positioning will apply. Anticipated bollard pull is 80
tons. Three of the aggregates will be sufficient to cope with maximum energy
requirements, conferring redundancy in the interests of ship reliability and
safety, while transits between work locations will usually be made at economic
speed with just two sets running, bringing fuel consumption down.
Hampshire-headquartered MAATS Tech, a leading
designer and supplier of cable lay and flex lay vessel carousels and deck
spread equipment, is providing the 2,000t carousel and associated gear. The
company worked closely with Vard, Colombo Dockyard and the Japanese client to
achieve the requisite design optimization and integration of mission equipment,
so that KCS can respond to the anticipated growth in Asian demand for subsea
power cable installation.
The vessel’s cable tanks will afford a total
5,000t cable carrying capacity. Her outfit will include a dual cable lay
system, A-frame, hydro plough and trenching ROV (remote-operated vehicle). All
work is conducted from the stern, as is the mode in modern cable layers,
eschewing the bow sheaves that characterized older, conventional cable ships.