Steel Catenary Riser (SCR) Hang-Off & TDP Calculator
Calculate deepwater steel catenary riser hang-off top tension, platform reaction loads, touchdown point location, and API RP 2RD structural stress utilization.
SCR Geometry & Water Depth
Fluids & Insulation Properties
SCR Top Tension & TDP Geometry
| Suspended Arc Length to TDP (S_tdp): | -- m |
| Horizontal Distance to TDP (X_tdp): | -- m |
| Submerged Line Weight (w_sub): | -- N/m (-- kg/m) |
| Horizontal Tension Component (H): | -- kN |
| Vertical Platform Reaction (V): | -- kN (-- t) |
| Top Axial Tensile Stress (σ_axial): | -- MPa |
| API RP 2RD Allowable Stress Utilization: | -- |
Recommended Tools & Equipment
Tested hardware and components for high reliability
Frequently Asked Questions
What is a Steel Catenary Riser (SCR) and where is it used?
A Steel Catenary Riser (SCR) is a cost-effective, heavy-wall rigid steel pipe that hangs freely in a natural catenary shape from a floating production facility (FPSO, Semi-Submersible, TLP, or SPAR) directly to the seabed. It conveys high-pressure, high-temperature hydrocarbons from subsea wells and export manifolds in water depths typically exceeding 1000 meters (3300 ft).
Why is the Touchdown Point (TDP) the most fatigue-critical area of an SCR?
As the floating platform heaves, rolls, and surges in ocean storm waves, the SCR touchdown point moves continuously back and forth across the seabed. This cyclic trenching motion subjects the pipe at the TDP to high cyclic bending moments, severe soil suction/gouging, and alternating compressive buckling loads, making TDP girth welds the dominant fatigue failure location.
What role does a flexjoint or titanium stress joint play at the SCR hang-off?
At the top hang-off porch on the platform hull, the riser is subject to rotational angular misalignment as the vessel rolls and pitches. A flexible elastomeric ball joint (flexjoint) or a tapered titanium stress joint (TSJ) is installed to accommodate dynamic angular rotations up to ±15° without generating catastrophic bending stress concentrations in the steel pipe.