Gas & vapor share the compressible-flow equation per API 520 §5.6. For two-phase flow or vapor near saturation, use API 520 Part II Omega method (not implemented here).
Burst / Set Pressure
Back Pressure
Burst Temperature
🧪 Fluid Properties
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Gas / Fluid
Mol. Wt M
Heat Ratio k?
Quick presets:
Sp. Gravity G
Compressibility Z
Use 1.0 for ideal gas. Get from NIST / HYSYS for real gas.
♨️ Steam Correction Factors
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Ksh (Superheat)
1.0 = saturated
Kn (Napier)
1.0 if P₁≤1500 psia
Kb (Back-press.)
💧 Liquid Sizing Factors
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Kw (Back-pressure)
Kc (Combination)
0.9 if disc upstream of SRV
Kv (Viscosity)
Liquid SG
Relative to water
📐 Capacity & Device
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Discharge Coeff. Kd
Confirm with manufacturer
Required Capacity W
Device MNFA
Disc Size (nominal)
Disc Model
🔍 Service Conditions (Disc Recommendation)
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Normal Operating Pressure
Vacuum Service
Upstream SRV?
Cyclic Service?
Graphite?
📊 Output Preferences
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Area Unit
Capacity Unit
Notes (printed on report)
⚗
Ready to Calculate
Fill in the parameters and click CALCULATE to see sizing results.
Use RECOMMEND DISC to get Flammer series recommendations based on your service conditions.