With 62 tonnes of bollard pull, this harbour vessel is the first of a new series of tractor tugs designed by Robert Allan and built by Sanmar
Port Taranaki has introduced a new type of tug to its fleet in response to growing requirements for ship support in one of New Zealand’s largest and busiest harbours. Kinaki has become one of the most powerful and advanced tugs operating in the nation’s harbours.
Its arrival heralded the start of a new chapter in New Zealand’s towage history. Kinaki initially arrived in Lyttelton, New Zealand in June this year after a 73-day journey on a heavy-lift transport ship from Istanbul, Turkey, where it was constructed.
This 25-m, 336-gt harbour tractor tug then sailed to its new home in New Plymouth, on New Zealand’s west coast, where it replaced the oldest of Port Taranaki’s three tugs – 47-year-old Kupe.
Kinaki was built by Sanmar Shipyards to an adapted Robert Allan design. It is the first to be completed in Sanmar’s TRAktor 2500-SX series and can be operated by a crew of just three seafarers, although it has accommodation for six people.
During sea trials, Kinaki achieved a free running ahead speed of 12.5 knots and bollard pull of 62 tonnes. It has a moulded beam of 12 m, a moulded hull depth of 4.5 m and maximum draught of 5.7 m.
Kinaki was designed and constructed to satisfy all applicable rules and regulations of ABS class. During its design, Robert Allan and Sanmar used computational fluid dynamics to streamline the hull and ensure an optimal balance between controllability, manoeuvrability, fuel efficiency and roll dampening. The TRAktor 2500-SX design was then tested at the Vienna Model Basin.
Its hull stern includes effective StRAke stabilisers developed by Robert Allan and Voith which improve a tractor tug’s directional stability and enable architects to reduce the skeg size to improve manoeuvrability and fuel efficiency, said Robert Allan.
These features were of particular importance to Port Taranaki’s operation in the tough conditions experienced on New Zealand’s west coast. So is the raised forecastle and elevated wheelhouse that provide good all-round visibility of the working decks. This is particularly useful when performing ship-assist operations off the stern, said Robert Allan.
Naval architects included a higher bow freeboard to enhance seakeeping when working in exposed waters and minimise the volume of seawater on board.
Kinaki’s accommodation includes a double cabin on the main deck and two double cabins on the lower deck. There is also a galley, mess room and wet gear room located on the main deck.
Propulsion and machinery
Kinaki’s main propulsion consists of a pair of Caterpillar 3512C diesel engines, each rated 1,902 kW at 1,800 rpm. These drive two Rolls-Royce US 205 P20 Z-drive units, each with a 2.5 m diameter controllable pitch propeller. Caterpillar also supplied two CAT C4.4 diesel generator sets, with each capable of generating 99 kW of electrical power at 1,500 rpm.
Its deck machinery includes a DMT-manufactured TW-021-E double drum towing winch on the aft deck, with a force of 250 kN spooled with 165 m of hawser towline on each drum.
There are shiphandling fenders at the stern that consist of one tier of 800 mm and 400-mm cylindrical fenders at the main deck level. Tires provide protection at the main and forecastle sides and sheer lines, and a single row of 300-mm hollow D-shaped fender protects the bilge.
Owner: Port Taranaki
Delivered: June 2018
Designer: Robert Allan
Type: tractor tug
Design: TRAktor 2500-SX
Length, oa: 25.30 m
Beam, moulded: 12.00 m
Hull depth, moulded: 4.55 m
Draught: 5.74 m
Bollard pull: 62 tonnes
Ahead speed: 12.5 knots
Main engines: 2 x CAT 3512C diesel
Thrusters: 2 x US 205 P20 Z-drive
Gensets: 2 x CAT C4.4
Accommodation: 6 crew
Fuel oil: 84 m3
Potable water: 12 m3
Fifi foam: 3.9 m3
Used oil tank: 3.0 m3
Sewage tank: 6.7 m3
Kinaki is the name of one of two mouri (life principal) stones that are situated within the breakwater of Port Taranaki.