Subsea Wellhead Fatigue & Bending Moment Calculator

Model cyclic bending moments transferred to conductor casing and wellhead datum from BOP stack dynamics, LFJ angles, and wave-induced Palmgren-Miner fatigue.

BOP Stack & Lower Flex Joint (LFJ) Dynamics

Subsea BOP Stack Mass (kips):

BOP Stack Height to LFJ (ft):

Mean Cyclic LFJ Angle (degrees):

LFJ Rotational Stiffness (ft-kips/deg):

Conductor Casing & Sea-Bed Fatigue Exposure

Conductor Casing OD (in):

Operating Drilling Days in Sea-State:

Dominant Wave Cycle Period Tz (seconds):

Wellhead Datum Moment & Cumulative Fatigue

Cyclic Bending Moment at Wellhead:

—

— kN·m

Hot-Spot Stress Range (Casing Weld):

—

— MPa

Total Accumulated Wave Cycles:

—

Palmgren-Miner Fatigue Damage (D):

—

Wellhead Structural Integrity Status:

—

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Subsea Wellhead Fatigue & Bending Moment Calculator

BOP Stack & Lower Flex Joint (LFJ) Dynamics

Conductor Casing & Sea-Bed Fatigue Exposure

Wellhead Datum Moment & Cumulative Fatigue

Frequently Asked Questions