Safety Valve Area (ASME I)

Approximate required safety-valve throat area from steam capacity and set pressure using the ASME Section I formula.

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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 = \frac{W}{51.5 \cdot P \cdot K_d \cdot K_b \cdot K_{sh}}

Symbol	Meaning	Unit
$W$	Steam capacity	kg/h
$P$	Set pressure absolute	bar
$K_d$	Valve coefficient of discharge
$K_b$	Back-pressure correction
$K_{sh}$	Superheat correction
$A$	Required throat area	mm²

Source: ASME BPVC Section I

Approximate required safety-valve throat area from steam capacity and set pressure using the ASME Section I formula.