Calculate api 520 esaslı gaz, steam and sıvı emniyet valfi Ön boyutlandırması using engineering units and the defined formula.
API 520 Gas, Steam and Liquid Safety Valve Preliminary Sizing
Calculate api 520 gas, steam and liquid safety valve preliminary sizing using engineering units and the defined formula.
Result chart
Formula and calculation steps
Note: Results are for preliminary engineering evaluation. Verify assumptions, material data, safety factors, applicable standards, and manufacturer limits before final design. Tool version 2.7.1
How to use this calculator
- Enter the measurements and operating values.
- Select the correct engineering unit for each value.
- Press Calculate to view the result and intermediate values.
- Review the equation steps and download a PDF report if needed.
Equation used
Gaz: A=ṁ/G; sıvı: A=Q/[Kd·Kb·Kc·Kv√(2ΔP/ρ)]
How to evaluate the result
Results are for preliminary engineering evaluation. Verify assumptions, material data, safety factors, applicable standards, and manufacturer limits before final design.
Technical references
Input guide for API 520 Gas, Steam and Liquid Safety Valve Preliminary Sizing
Calculate api 520 gas, steam and liquid safety valve preliminary sizing using engineering units and the defined formula. The table below summarises the inputs and example starting values.
| Parameter | Example value | Units and description |
|---|---|---|
| Fluid modeli | gas | Gas / buhar, Fluid |
| Required tahliye debisi | 10000 | kg/h |
| Set basıncı | 10 | bar(g) — Enter the value required by the equation. |
| Allowable aşırı basınç | 10 | % |
| Arka basınç | 1 | bar(g) — Enter the value required by the equation. |
| Tahliye sıcaklığı | 150 | °C |
| Molekül ağırlığı | 28.97 | kg/kmol — Enter the value required by the equation. |
| Specific ısı oranı k | 1.4 | Enter the value required by the equation. |
| Compressiblelik Z | 1.0 | Enter the value required by the equation. |
| Fluid yoğunluğu | 850 | kg/m³ — Enter the value required by the equation. |
| Boşaltma katsayısı Kd | 0.975 | Dimensionless or selection value |
| Arka basınç faktörü Kb | 1.0 | Dimensionless or selection value |
| Kombinasyon faktörü Kc | 1.0 | Dimensionless or selection value |
| Viscosity faktörü Kv | 1.0 | Dimensionless or selection value |
Example calculation scenario
For an initial check, enter the example values from the table, select the required units, and choose Calculate. Review the main result and equation, then replace the examples with measured or design data from your system.
Common mistakes when using API 520 Gas, Steam and Liquid Safety Valve Preliminary Sizing
- Ignoring transmission efficiency, service factor, or transient operating conditions.
- Mixing unit systems without checking the selected units.
- Using example values instead of measured or design data from the actual system.
- Accepting the result without checking safety factors, duty cycle, and manufacturer limits.
Fundamental equation: Gaz: A=ṁ/G; sıvı: A=Q/[Kd·Kb·Kc·Kv√(2ΔP/ρ)]
Frequently asked questions
What is API 520 Gas, Steam and Liquid Safety Valve Preliminary Sizing used for?
Calculate api 520 gas, steam and liquid safety valve preliminary sizing using engineering units and the defined formula. Use it for preliminary engineering sizing and independent result checks.
Which equation does this calculator use?
The calculation is based on Gaz: A=ṁ/G; sıvı: A=Q/[Kd·Kb·Kc·Kv√(2ΔP/ρ)]. Inputs are converted according to the selected units.
Can the result be used as a final design value?
Results are for preliminary engineering evaluation. Verify assumptions, material data, safety factors, applicable standards, and manufacturer limits before final design. Confirm the result against the current standard, project specification, and manufacturer data.
