Jumboising of tshd Queen of The Netherlands

In 1999, the Dutch dredging contractor Royal Boskalis Westminster N.V. took delivery of the trailing suction hopper dredger ’Queen of The Netherlands’. Built by Verolme Shipyard Heusden, she belongs to world’s largest trailing suction dredgers. The vessel underwent an extensive modification which resulted in an enlargement of the dredger’s hopper capacity with more than 50 percent and improved deep-water dredging capabilities.

 Principal dimensions    
   Before lengthening After lengthening
Length o.a.
173.15  230.71
 Length b.p.p.  154.12  211.58
 Breadth, moulded  32.00  32.00
 Depth, moulded  13.10  15.90
 Draught at international loadline  9.80  10.39
 Draught at dredging loadline  11.49  13.68
 Gross tonnage   22 689  33 423
     
 Capacity    
 Deadweight
 31 326
 59 168 ton
 Hopper capacity  23 347 35 500 m3
 Service speed  16.7  16.0 kn
     
 Dredging equipment    
 Two trailing suction pipes, diameter
 1 200
 1 200 mm
 Dredging depth  33, 55, 85 & 112  67 & 83 m
 Total installed power  27 634  27 634 kW
 Dredge pump output  12 000

SB : 7 000 kW
PS : 6 000 kW

 Jet pump output  3 000  3 000 kW
 Pump ashore output  12 000  12 000 kW
 Propulsion power sailing  20 000  23 000 kW
 Bowthruster  1 400  2 650 kW
 Bow discharge  1 000  1 000 mm
 Bottom doors  2x 10  2x 12

 

Modifications

To achieve the new dimensions and capacities, the dredger was rebuilt as follows:

  • • inserting midship section of about 54 metres
  • • increase of main deck depth with approx. 4 metres
  • • addition of bulbous bow
  • • addition of a ducktail of about 5 metres
  • • replacement of bow thruster
  • • modification of hopper loading and discharge system
  • • removal and replacement of trailing suction suction pipes, complete with
    gantries and winches

The lengthening section was prefabricated and fully equipped with bottom doors, hydraulic cylinders and piping in Thailand. On completion the section was towed to a shipyard in Singapore. Before arrival of the original ’Queen of The Netherlands’, all prefabrication and preparations were finalized. The vessel was then brought into dry-dock and was cut
into two pieces. Next the fore ship was floated out and the aft ship remained in the dry-dock. Then the lenghtening section and the fore ship were floated back sequentially. After the dock was dry again and dock blocks were settled, both sections were skidded to the right position, aligned and welded to the aft ship. In the meantime deck sections, other steel sections and additional equipment were fitted. The vessel was put back into service after a series of extensive tests.

Vuyk scope of work

In close cooperations with the owners, Vuyk Engineering Rotterdam carried out a major part of the total engineering package required for the works in Thailand and Singapore.

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