PORT ENGINEERING MANAGEMENT REPAIRS
R E PA I R S
D R E D G E R R E PA I R S AT R E M O N TOWA
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During October this year, Van Oord’s 18,893 m3 TSHD Vox Amalia was drydocked at Poland’s Remontowa, Gdansk. The shipyard carried out, among others, modifications to her pipelines and dredging systems. During the drydock work, the sea chest was enlarged and the suction pipes for the jet pumps has been modified (the system for flushing the hopper and pipes used for dredging). Due to this modification in the jet pump room several pipelines have been rerouted and modified (de-aeration of sea chest, LT pipes). Several connections were made between a new jet-water line to the selfemptying lines to liquefy the clog issues when starting-up the self-emptying process of the hopper – the systems have been connected using GRE pipes. A new installation of a degassing system for underwater pumps on the dredging pipe system was also added, including foundations, pumps, ejectors, valves and flowmeters. In addition, the sieve installation was dismantled and original dredge pipes have been installed to their original state. Maintenance work on dragheads was carried out, including replacement of UXO grids and nozzle bushes as well as modification of the Jet system pipes at the draghead connection. As the first task of the Vox Amalia following her departure from Remontowa was to dredge the fairway leading to one of the Polish seaports, she has been fitted with explosion-proof screens to protect the crew in the event of hazardous material (unexploded ordnances) being sucked into the system. One of the
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tasks was also electrical work, involving the connection of the aforementioned systems. Earlier this year Remontowa repaired two vessels belonging to Holland’s Royal Boskalis Westminster - the 2,000 kW backhoe dredger Nordic Giant dredger and the 5,551 gt cable-layer Spirit. The Nordic Giant is equipped with a powerful Liebherr P995 excavator, which enables dredging up to 23 m depth. During operation, the unit is supported on three anchor posts (spuds), i.e. tall steel structures that provide stability during dredging. During the repairs, maintenance and painting work on-board the dredger’s hull, fresh water tank, deck and superstructure. Deep cracks were repaired in the lower part of the side spuds, and the bow leg had part of its lower, heavily worn structure replaced. A time-consuming task was to dismantle more than 60 fenders, perform maintenance works on the hull, where they were installed, and reinstall them. In Boskalis’ Spirit in Remontowa
