Tug Bollard Pull Required

Estimate tug bollard pull needed for a given displacement based on Henn & Dunlop empirical rule used in major ports.

MooringTug

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

BP \approx 60 \cdot \tfrac{\Delta}{60000} + 0.2, \quad BP_\text{wind} = 1.5 \cdot \tfrac{F_\text{wind}}{g}

Symbol	Meaning	Unit
$Δ$	Ship displacement	t
$A$	Exposed side area above water	m²
$V$	Design wind speed	m/s
$BP$	Bollard pull required per tug	t

Source: PIANC WG30 - Tugs and Marine Operations; Port of Rotterdam Tug Assistance Guidelines

Estimate tug bollard pull needed for a given displacement based on Henn & Dunlop empirical rule used in major ports.