Calculate volume stock tank vapors to size Vapor Recovery Unit 1

[elquesifilma]

I need to calculate volume stock tank vapors (scfd) to size Vapor Recovery Unit. The total volume needs to account for flash losses, working and breathing losses.

The facility currently has a 3-phase production separator which operates at normal operation pressure 50 psi ( min 35 psi, max 70 psi). The separator dumps the oil into 2-500 bbl oil tanks. The water is dumped into 2-500 bbl water tanks and gas is sold through a meter run. The gas needs to be pressurized to a range of 35-70 psig to be able to be transferred to the main compressor.

Production separator normal operation pressure: 50 psi.
Temperature: 90 F

Oil production rate: 250 bbl/day
Water production rate: 3500 bbls/day
Gas production rate:250,000 scfd.

API gravity: 39
SG of water: 1.135

Gas analysis:
Mole %
N2 1.8938
CO2 0.2237
H2S 0.0047
C1 80.7232
C2 8.0648
C3 4.2067
iC4 0.8600
nC4 1.6946
iC5 0.7648
nC5 0.3976
C6+ 1.1661
Totals 100

Could someone please provide me some help, guidelines, publications, or excel calculations to get me started on this exercise. I appreciate any help.

Thanks in advance!!

 

[dcasto]

here is the vb flash that use to be valid in most states for predicting vapour losses. If you want better estimates, you'll have to use a simulation program

 

[MortenA]

Maybe you should contact coolsorption - they specialises in this type of units:

http://www.coolsorption.dk/

Best regards
Morten