IS Code - Severe-Wind & Rolling Criterion

Intact stability weather criterion (IS Code §2.3) - the dead-ship side-wind + roll assessment that governs many passenger and offshore vessels.

IS CodeStabilityWeather

Lateral wind aream²Centroid height above WL/2mDisplacementtRoll-back angledegWind pressure (504 N/m² default)N/m²

Steady wind heeling arm: 0.030m

Gust heeling arm: 0.045m

Screening: Likely compliant - verify area b ≥ area a

Changing the inputs requires JavaScript. The calculator above shows its default inputs and result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

l_{w1} = \frac{P \cdot A \cdot Z}{1000\,g\,\Delta}, \quad l_{w2} = 1.5 \cdot l_{w1}

Symbol	Meaning	Unit
$P$	Wind pressure	N/m²
$A$	Lateral wind area	m²
$Z$	Centroid above WL/2	m
$\Delta$	Displacement	t

Source: IMO 2008 IS Code §2.3

In short

Intact stability weather criterion (IS Code \u00a72.

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