Vapor Recovery Unit Sizing
Calculate VRU requirements for tank batteries and loading operations
Vapor Generation Sources
Enter production and operational parameters
VRU Sizing Results
Enter parameters and click Calculate
Formula Reference
Flash Gas Calculation (Vasquez-Beggs)
Flash Ratio = (P1/P2)^(1/n) - 1
Simplified Flash Gas Rate:
Qflash (MCFD) = Oil_Rate * GOR * Flash_Factor / 1000
Flash Factor = 1 - (Ptank/Psep)^0.5
Where:
Ptank = Tank pressure (psia)
Psep = Separator pressure (psia)
Working Losses (EPA AP-42)
Working Loss:
Lw = 0.0010 * Mv * Pva * D * H * N * Kn * Kp
Where:
Mv = Molecular weight of vapor
Pva = Vapor pressure at temperature
D = Tank diameter (ft)
H = Outage height (ft)
N = Number of turnovers per year
Kn = Turnover factor
Kp = Product factor
Compressor Sizing
Compression Ratio:
r = (P_discharge + 14.7) / (P_suction + 14.7)
Adiabatic HP (per stage):
HP = (Q * P1 * k) / (229.17 * (k-1)) * [(r^((k-1)/k)) - 1]
Where:
Q = Flow rate (MCFD)
P1 = Suction pressure (psia)
k = Specific heat ratio (~1.26 for hydrocarbon gas)
r = Compression ratio