Relief Valve Sizing Calculator (API 520/521)
Service Type
psig
psig
°F
Required Orifice Area110.8829 in²
Selected OrificeT (26.000 in²)
Rated Capacity11,724.1
Kd (Discharge)0.975
Kb (Back Pressure)1.000
Kc (Combination)1.000
Overpressure10%
API 526 Standard Orifices
| Orifice | Area (in²)↕ |
|---|---|
| D | 0.110 |
| E | 0.196 |
| F | 0.307 |
| G | 0.503 |
| H | 0.785 |
| J | 1.287 |
| K | 1.838 |
| L | 2.853 |
| M | 3.600 |
| N | 4.340 |
| P | 6.380 |
| Q | 11.050 |
| R | 16.000 |
| T | 26.000 |