| NATIONAL OILWELL VARCO NORWAY AS Patent applications |
| Patent application number | Title | Published |
|---|
| 20120034061 | METHOD AND DEVICE FOR HOISTING AN ITEM BY MEANS OF A CRANE - 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. | 02-09-2012 |
| 20110233017 | MOUSE HOLE DAMPER DEVICE - A mouse hole damper device positioned at the bottom portion of a mouse hole pipe, the mouse hole damper being arranged to dampen an impact from an object falling in the mouse hole pipe, and the mouse hole damper including a material which has been worked into forming walls around elongated openings, and the material being arranged in such a way that the openings are substantially parallel to the longitudinal axis of the mouse hole pipe. | 09-29-2011 |
| 20110084636 | METHOD FOR REDUCING COGGING TORQUE EFFECTS OF AN ELECTRICAL PERMANENT MAGNET MACHINE - A method for reducing cogging torque effects of an electrical permanent magnet machine includes running an “a” test and a “b” test with different cogging compensation signals. A first value is calculated by multiplying a complex cogging amplitude of the compensation signal applied for the “a” test with a complex amplitude of a vibration signal resulting from cogging torque of the “b” test. A second value is calculated by multiplying a complex cogging amplitude of the compensation signal applied for the “b” test with a complex amplitude of the vibration signal resulting from cogging torque of the “a” test. A desired complex cogging compensation amplitude is calculated by dividing the difference between the first and second values by a difference between the complex amplitudes of the vibration signals resulting from the “b” test and the “a” test. A cogging compensation torque is applied to the machine based on the desired complex cogging compensation amplitude. | 04-14-2011 |
| 20110047773 | Method and Device for Chain Wheel Change - A method for changing a chain wheel, a first chain wheel being on an axle, the method comprising (a) positioning a hydraulic cylinder at least partially within the axle. In addition, the method comprises (b) moving the first chain wheel off the axle with the hydraulic cylinder. Further, the method comprises (c) connecting the first chain wheel to a conveying device while the first chain wheel is held in position by the hydraulic cylinder. Still further, the method comprises (d) connecting a second chain wheel to the hydraulic cylinder while the second chain wheel is held in position by the conveying device. Moreover, the method comprises (e) moving the second chain wheel onto the axle with the hydraulic cylinder. | 03-03-2011 |
