HomeCalculatorsVoluntary Structural Enhancement (fᵥˢᵉ)

Voluntary Structural Enhancement (fᵥˢᵉ)

Look up the fᵥˢᵉ EEDI correction factor for tankers and bulkers with voluntary CSR-H structural enhancement beyond class-rule minimums.

IMODesignMEPC.1/Circ.816

Length between perpendicularsmExtra steel weighttMass of structural steel added above CSR-H minimums.

Correction factor fᵥˢᵉ

1.0123

Formula - MEPC.1/Circ.816

fᵥˢᵉ = DWT_baseline / (DWT_baseline − extra_steel)

The correction compensates DWT loss from voluntary structural reinforcement that improves safety/longevity but reduces carrying capacity. Numerator uses a "baseline" DWT estimated from hull parameters; a common simplification for the v1 calculator is DWT_baseline ≈ 0.85 × (LBP)² (indicative only; actual figure comes from hydrostatic tables). Verify with class society before use in filings.