Hatch Cover Deflection Limit (UR S21)

Maximum permissible mid-span deflection of a weather-deck hatch cover: L/200 per IACS UR S21.

StructuralIACS S21

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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

\delta_\text{mid} \leq \frac{L}{200}

Symbol	Meaning	Unit
$L$	Unsupported span	m
$δ$	Mid-span deflection	mm

Source: IACS UR S21 and S21A

Maximum permissible mid-span deflection of a weather-deck hatch cover: L/200 per IACS UR S21.