发明名称 METHOD AND DEVICE FOR HOISTING AN ITEM BY MEANS OF A CRANE
摘要 A method and a device for hoisting an item at sea with a hoisting device comprises moving the item between a plurality of different height levels. In addition, the method comprises alternately supporting the load of the item with a first hoisting rope and a second hoisting rope while moving the item between the plurality of different height levels. Further, the method comprises arranging the first hoisting rope and the second hoisting rope to extend in parallel along at least part of the distance between the item and the hoisting device. Still further, the method comprises releasably connecting the first hoisting rope to the second hoisting rope. Moreover, the method comprises suspending the second hoisting rope from a hanger when the second hoisting rope is supporting the load of the item. The method also comprises connecting the hanger to an arm of the hoisting device.
申请公布号 US2012034061(A1) 申请公布日期 2012.02.09
申请号 US201013201672 申请日期 2010.02.08
申请人 BOROY YNGVAR;NATIONAL OILWELL VARCO NORWAY AS 发明人 BOROY YNGVAR
分类号 B66C23/52;B66C23/62 主分类号 B66C23/52
代理机构 代理人
主权项
地址