On a drillship, who has the authority to order an emergency LMRP disconnect?

A. The DPO has independent authority to initiate a disconnect when riser angle approaches the red limit, without waiting for OIM or driller authority — the Master, OIM, and driller can also initiate one; this is one of the few DP operations where immediate DPO action without prior authorisation is specifically sanctioned because the time window may not permit seeking permission

B. The classification society surveyor must be consulted before any LMRP disconnect

C. Only the OIM can order a disconnect — the DPO must always seek OIM authority first

D. Only the driller can order a disconnect since the well is under their control

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