Crankcase Explosion-Relief Area (UR M9)

Minimum total vent area of explosion-relief valves for a crankcase, per IACS UR M9.

StructuralIACS M9

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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

A_\text{relief} = \max(45, 115 \cdot V_\text{crank})

Symbol	Meaning	Unit
$V_\text{crank}$	Crankcase gross volume	m³
$A_\text{relief}$	Relief-valve area total	cm²

Source: IACS UR M9

Minimum total vent area of explosion-relief valves for a crankcase, per IACS UR M9.