Offshore Structural Engineering Tools

Disclaimer: These tools are for preliminary estimation only. Always verify results with qualified engineers and applicable design codes (API RP 2A-WSD, ISO 19902, DNVGL-ST-0126, API RP 2GEO). Do not use for final design without independent verification.

🌊

Morison Wave Force

Drag + inertia forces on cylindrical members (API RP 2A)

Env. Loads

Diameter D (m)

Water Depth d (m)

Wave Height H (m)

Wave Period T (s)

Drag Coeff Cd

Inertia Coeff Cm

Enter wave conditions and click Calculate

💨

Wind Load — Topsides & Decks

Wind force on offshore structures (API RP 2A-WSD §2.3)

Env. Loads

Design Wind Speed V (m/s, 1-hr mean)

Projected Area A (m²)

Shape / Drag Factor Cs

Height Factor Ch (elevation above MSL)

Enter wind parameters and click Calculate

🌀

Current & Wind Drag — Members

Drag force on cylindrical members (Moody / DNVGL)

Env. Loads

Load Type

Velocity (m/s)

Diameter (m)

Member Length (m)

Drag Coefficient Cd

Enter flow parameters and click Calculate

🔌

Pile Axial Capacity

Skin friction + tip resistance (API RP 2A-WSD §6.4)

Foundation

Pile Diameter (m)

Embedment Depth (m)

Soil Type

Unit Weight γ (kN/m³)

Friction Angle ϕ (°)

Enter pile geometry and soil parameters

🏗

Jacket Pile Size Estimator

Preliminary pile OD & wall thickness (empirical)

Foundation

Water Depth (m)

Total Deck Load (tonnes)

Environmental Zone

Number of Piles

Enter platform parameters and click Estimate

🌍

Scour Depth Estimation

Equilibrium scour around monopile (DNVGL-ST-0126)

Foundation

Pile / Structure Diameter (m)

Near-bed Current Velocity (m/s)

Median Grain Size D50 (mm)

Enter pile size and seabed parameters

📅

Hydrostatic Collapse Pressure

External pressure resistance for subsea pipes & risers (API 1111 / DNVGL-ST-F101)

Structural

Outer Diameter OD (mm)

Wall Thickness WT (mm)

Water Depth (m)

SMYS Fy (MPa)

Young's Modulus E (GPa)

Code & Design Factor fd

Enter pipe geometry and water depth

⚒

Tubular Joint Classification

K, T, Y, X joint type per API RP 2A geometry

Structural

Chord OD Dc (mm)

Chord WT Tc (mm)

Brace OD Dm (mm)

Brace WT Tm (mm)

Brace Angle θ (degrees)

Joint Configuration

Enter chord and brace dimensions

📈

SCF Calculator — Efthymiou

Stress Concentration Factors for tubular joints (T/Y/K/X)

Structural

Chord OD Dc (mm)

Chord WT Tc (mm)

Brace OD Dm (mm)

Brace WT Tm (mm)

Chord Length Lc (mm)

Brace Angle θ (°)

Enter joint geometry to compute SCF

⚡

API RP 2A Unity Check

Combined axial + bending UC for tubular members (WSD)

Structural

Axial Stress fa (MPa)

Bending Stress fb (MPa)

Shear Stress fv (MPa)

Yield Strength Fy (MPa)

Outer Diameter OD (mm)

Wall Thickness WT (mm)

Member Length L (m)

Enter member stresses and dimensions

🚢

Pipeline / Spool Buoyancy

Net buoyancy and submerged weight check

Pipeline

Outer Diameter OD (mm)

Wall Thickness WT (mm)

Spool / Pipe Length (m)

Content

Enter pipe dimensions and content type

🌧

Pipeline Free Span VIV

Vortex-induced vibration check (DNVGL-RP-F105)

Pipeline

Pipe Outer Diameter (m)

Free Span Length (m)

Current Velocity (m/s)

Effective Tension (kN)

Submerged Mass (kg/m)

Enter span geometry and flow conditions

⚓

Mooring Line Tension

Catenary mooring — horizontal restoring force

Marine

Submerged Line Weight w (kN/m)

Water Depth d (m)

Total Line Length L (m)

Horizontal Tension H (kN, at fairlead)

Enter catenary mooring parameters

🛡

Cathodic Protection Sizing

Sacrificial anode weight & quantity (DNV-RP-B401)

Marine

Surface Area (m²)

Design Life (years)

Current Density (mA/m²)

Coating Efficiency (%)

Anode Material

Standard Anode Net Weight (kg)

Enter structure area and life requirements

📈

Fatigue Life Estimation

S-N curve analysis per DNV-GL RP-C203 / API RP 2A

Fatigue

Stress Range ΔS (MPa)

SCF (default 1.0)

S-N Curve (DNV-GL RP-C203)

Annual Loading Cycles (default 5×10⁶)

Enter stress range and S-N curve parameters

🔧

Rigging & Sling Load

Sling tension for multi-leg lifts (DNVGL-ST-N001)

Integrity

Lifted Weight W (tonnes)

Number of Sling Legs

Sling Angle from Vertical θ (°)

Design Factor (DNVGL, default 1.3)

Enter lift weight and rigging geometry

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