What DP class is typically required for a drillship or semi-submersible MODU operating directly over a well?

A. DP2 is the minimum class required for drilling over a subsea wellhead — single failure must not result in loss of position that could cause riser damage or a well control incident; DP3 may be required by some operators or for specific well types

B. No minimum DP class is specified for drilling operations — it is at the operator's discretion

C. DP1 is sufficient for all drilling operations

D. The DP class requirement depends solely on water depth, not on whether the vessel is over a well

A. An LMRP disconnect occurs automatically whenever the DP system goes to joystick mode

B. The LMRP is only disconnected when drilling operations are completed for the well

C. An LMRP (Lower Marine Riser Package) disconnect is an emergency separation of the riser/BOP stack at the connector below the BOP, triggered when the vessel cannot hold position adequately to prevent riser overstress or when a drive-off/drift-off puts the riser beyond its angular tolerance — it disconnects the vessel from the wellhead before the riser is damaged or pulls the BOP off the wellhead

D. An LMRP disconnect is a planned daily procedure carried out to inspect the BOP

A. The colour zones represent thruster availability: green = all thrusters online, yellow = one thruster offline, red = two or more offline

B. Green = normal operating range (riser within safe angular limits); Yellow = advisory — riser angle approaching limits, increased monitoring required; Red = riser angle at or beyond limits — LMRP disconnect must be initiated; these limits are defined in the WSOG for the specific well and riser configuration

C. Red means the riser is fully vertical; green means it is at its maximum angle

D. The colours indicate weather severity, not riser angle