55.9)- ANTI-SWING SYSTEM: PC1530. For handling Riser and drill pipe on a Rolling Drillship with a gantry overhead crane ,the pipes hanging underneath the crane start.
acc.the roll ( 15 degrees in 30 sec.) and the operator is facing some problems to catch the transport Cart running on the Catwalk. When you have a Clock with a Pendule ,ie the clock is fixed and Pendule moves from Right and Left ,when you fixed the pendule the Clock moves. By building in at the hoist wires absolute encoders + PC program,the SWING of the pipe will steady and overhead crane moves a few times,all demonstrated to Reading and Bates on Deepwater Discovery. Patended and show on sketch 55.9.