Drilling Riser Disconnect Watch Circle Calculator

Determine dynamic positioning (DP) drift-off velocities, Green/Yellow/Red watch circles, and emergency disconnect sequencing (EDS) margins before flex joint mechanical binding.

Vessel & Water Depth Parameters

Water Depth (ft):

Surface Current Velocity (knots):

Wind Speed (knots):

Drift Acceleration Time Const (s):

Subsea Disconnect Limits & EDS Timing

Max Allowable LFJ Angle at EDS (°): Mechanical binding limit typically 10°

BOP Emergency Disconnect Time T_eds (s): Shear drill pipe + unlatch LMRP

Watch Circle Radii & Disconnect Timelines

Terminal Drift Velocity:

—

— ft/s

Point of Physical Disconnect (POD):

—

— % water depth

GREEN (Normal)

—

YELLOW (Advisory)

—

RED (Execute EDS)

—

Available Decision Time:

—

EDS Operational Viability:

—

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Drilling Riser Disconnect Watch Circle Calculator

Vessel & Water Depth Parameters

Subsea Disconnect Limits & EDS Timing

Watch Circle Radii & Disconnect Timelines

Frequently Asked Questions