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Queen of the Netherlands (ship)
The ''Queen of the Netherlands'' is a Dutch trailing suction hopper dredging ship constructed in 1998. After lengthening in 2009, it was the largest and most powerful dredger in the world. The vessel has been used in high-profile salvage and dredging operations including the investigation into the Swissair Flight 111 crash and in the Port Phillip Channel Deepening Project. It has been called "the world's largest floating vacuum cleaner".〔
== Capability ==
The ship's dragheads are wide and can dredge between and deep. The ship has three hopper discharge options of pumping ashore by pipeline, dumping through bottom doors or rainbowing.〔(【引用サイトリンク】 publisher =Royal Boskalis Westminster )〕 The ship has equipment to dredge almost any material; such as clay, silt, sand and rock. During the Swissair Flight 111 salvage operation, a mixture of sea water, silt and aircraft pieces was pumped out of the Atlantic Ocean. The ship assisted in the recovery of nearly 98% of the aircraft, with over of aircraft and cargo pieces salvaged.〔(【引用サイトリンク】 publisher =Transportation Safety Board of Canada )〕 The pump room onboard has two dredge engines that can be used in series or in parallel with the vessels two suction pipes or combined with a submerged outboard pump. The vessel also has three jet water pumps that are used to agitate subsea material whilst trailing, collapse & liquify hopper cargo for pumping or degassing natural air pockets in the seabed using the venturi effect.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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