Safety Valve Area (ASME I)
Approximate required safety-valve throat area from steam capacity and set pressure using the ASME Section I formula.
Required throat area
3,206mm²
Formula, assumptions, and limits
ASME Section I steam discharge formula (W in lb/h, P in psia, A in in²). We convert units inline so inputs can be kg/h and bar. Always size to the ASME-certified flow rate on the valve nameplate, not the calculated throat area alone.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Steam capacity | kg/h | boiler rating | |
| Set pressure absolute | bar | boiler design | |
| Valve coefficient of discharge | - | valve data sheet | |
| Back-pressure correction | - | ASME I | |
| Superheat correction | - | ASME I | |
| Required throat area | mm² | result |