For platform rigs operating in deep water, which two systems accommodate movement caused by water and wind?

For platform rigs operating in deep water, which two systems accommodate movement caused by water and wind?

• A. Dynamic Positioning and anchor mooring
• B. Buoyancy control and tethering
• C. Guyed-tower rigs and tension-leg rigs
• D. Free-spinning mooring and heave compensation

Answer: (C)

Deepwater rigs must handle strong environmental loads while staying in a defined position. Some platforms achieve stability by designed flexibility, allowing movement rather than forcing the structure into a rigid, fixed stance. A tension-leg platform uses vertical tendons in constant tension attached to seabed anchors; the tendons provide vertical stability and restraint, but the hull can move horizontally with waves and wind within the limits set by the tendon geometry. A guyed-tower rig uses external guy wires stretched from the tower to anchors on the seafloor; these wires stabilize the tall structure against lateral sway while still permitting controlled movement with the sea. Together, these systems accommodate movement caused by water and wind by offering stability through tensioned support rather than full rigidity.

Deepwater rigs must handle strong environmental loads while staying in a defined position. Some platforms achieve stability by designed flexibility, allowing movement rather than forcing the structure into a rigid, fixed stance. A tension-leg platform uses vertical tendons in constant tension attached to seabed anchors; the tendons provide vertical stability and restraint, but the hull can move horizontally with waves and wind within the limits set by the tendon geometry. A guyed-tower rig uses external guy wires stretched from the tower to anchors on the seafloor; these wires stabilize the tall structure against lateral sway while still permitting controlled movement with the sea. Together, these systems accommodate movement caused by water and wind by offering stability through tensioned support rather than full rigidity.