The Trailing Suction Hopper Dredger (TSHD) 650 ordered by Gippsland Ports of Victoria, Australia, in December 2015 was recently been launched at Damen Yichang Shipyard in China.
The vessel, named Tommy Norton, was taken alongside the yard’s new quay undergoing final commissioning, after which she will sail for Shanghai to undertake sea trials. Once those are completed she will sail for Australia on her own keel for dredging trials and delivery. The official handover will take place in August 2017.
Among its various marine infrastructure responsibilities for the state of Victoria, Gippsland Ports is the designated waterway manager of 1,431 km2 of some of the largest and most beautiful waterways in Australia, stretching from Anderson Inlet to Mallacoota over 720km of the south-eastern coastline of Victoria.
The new dredger will be used to maintain entry to the port of Lakes Entrance and the Gippsland Lakes system, which is used by recreational, fishing and supply vessels.
To achieve this mission effectively the TSHD 650 has been modified to increase the installed propulsion power, allowing her to manage the strong currents encountered in the harbour’s entrance.
To minimise disruption to the local ecosystem, an anti-turbidity valve has been fitted on the overflow to reduce air bubbles and visible plumage in the water. Additional features include an indication package to measure soil density. This allows the suction pipe to be angled precisely for accurate operations.
The dredging process will be made even more efficient by the installation of the navigational dredging aid, NavGuard, indicating the area and quantity of substrate dredged.
Capable of dredging to depths of 15 metres, the dredger has been built with self-emptying capabilities with bottom doors for dumping and the choice of either a bow connection or rainbow expulsion for beach reclamation work. In order to increase the vessel’s payload capacity when dredging sand with a high specific density, Damen has reduced the freeboard of the vessel and applied a dredge mark.