Depressuring - Dynamics:

DESIGN

Connections

Inlet ,1,,

Vessel Volume (ft3),4.832e+004,,

Flat End Vessel Volume (ft3),4.832e+004,Cylindrical

Diameter (in),30,

Heat Loss Model : Simple ,

Overall U (Btu/hr-ft2-F),2.642,Overall Heat Transfer Area (ft2),5604

Ambient Temperature (F),77.00, ,

Valve Parameters

Vapour Flow Equation ,Fisher,Liquid Flow Equation ,(No Flow)

Cv (USGPM),30.00, ,

% Opening ,100.0, ,

Vapour Back Pressure (psia),14.70,Liquid Back Pressure (psia),14.70

Options

PV Work Term Contribution (%),0.00,,

Operating Conditions

Operating Pressure (psia),584.7,Depressuring Time (seconds),900.0

Time Step Size ,, ,

Vapour Outlet Solving Option ,Calculate P ,Final Pressure (psia),544.2

Cv or Av (USGPM),30.00, ,

WORKSHEET

Properties

Name ,1,,,,

Vapour Fraction ,1.0000,,,,

Temperature (F),90.00,,,,

Pressure (psia),584.7,,,,

Actual Vol. Flow (barrel/day),4.768e+005,,,,

Mass Enthalpy (Btu/lb),-2141,,,,

Mass Entropy (Btu/lb-F),1.823,,,,

Molecular Weight ,20.55,,,,

Molar Density (lbmole/ft3),0.1090,,,,

Mass Density (lb/ft3),2.241,,,,

Std Ideal Liq Mass Density (lb/ft3),22.33,,,,

Liq Mass Density @Std Cond (lb/ft3),,,,,

Molar Heat Capacity (Btu/lbmole-F),10.92,,,,

Mass Heat Capacity (Btu/lb-F),0.5315,,,,

Thermal Conductivity (Btu/hr-ft-F),1.999e-002,,,,

Viscosity (cP),1.261e-002,,,,

Surface Tension (dyne/cm),,,,,

Specific Heat (Btu/lbmole-F),10.92,,,,

Z Factor ,0.9090,,,,

Vap. Frac. (molar basis) ,1.0000,,,,

Vap. Frac. (mass basis) ,1.0000,,,,

Vap. Frac. (Volume Basis) ,1.0000,,,,

Molar Volume (ft3/lbmole),9.170,,,,

Act.Gas Flow (ACFM),1859,,,,

Act.Liq.Flow (USGPM),,,,,

Std.Liq.Vol.Flow (barrel/day),,,,,

Std.Gas Flow (MMSCFD),110.8,,,,

Watson K ,17.18,,,,

Kinematic Viscosity (cSt),0.3513,,,,

Cp/Cv ,1.425,,,,

Lower Heating Value (Btu/lbmole),3.633e+005,,,,

Mass Lower Heating Value (Btu/lb),1.768e+004,,,,

Liquid Fraction ,0.0000,,,,

Partial Pressure of CO2 (psia),45.09,,,,

Avg.Liq.Density (lbmole/ft3),1.087,,,,

Heat Of Vap. (Btu/lbmole),4127,,,,

Mass Heat Of Vap. (Btu/lb),200.8,,,,

COMPOSITIONS

,1 ,,,

Methane ,0.8085,,,

Ethane ,0.0795,,,

Propane ,0.0225,,,

i-Butane ,0.0038,,,

n-Butane ,0.0048,,,

i-Pentane ,0.0014,,,

n-Pentane ,0.0011,,,

n-Hexane ,0.0009,,,

n-Heptane ,0.0003,,,

n-Octane ,0.0001,,,

n-Nonane ,0.0000,,,

n-Decane ,0.0000,,,

n-C11 ,0.0000,,,

CO2 ,0.0771,,,

PERFORMANCE

Results

Initial Pressure (psia),584.7,Vessel Fluid Final Temperature - Liquid Phase (F),86.66

Final Pressure (psia),544.2,Vessel Fluid Minimum Temperature - Liquid Phase (F),86.66

Depressuring Time (seconds),900.0,Valve Outlet Initial Temperature - Liquid Phase (F),49.51

Vapour Cv (USGPM),30.00,Valve Outlet Final Temperature - Liquid Phase (F),49.51

Liquid Cv ,,Valve Outlet Minimum Temperature - Liquid Phase (F),49.51

Vessel Fluid Initial Temperature - Vapour Phase (F),90.00,Inner Wall Initial Temperature - Liquid Phase (F),

Vesssel Fluid Final Temperature - Vapour Phase (F),86.66,Inner Wall Final Temperature - Liquid Phase (F),

Vessel Fluid Minimum Temperature - Vapour Phase (F),86.66,Inner Wall Minimum Temperature - Liquid Phase (F),

Valve Outlet Initial Temperature - Vapour Phase (F),49.51,Initial Mass of Vapour (lb),1.082e+005

Valve Outlet Final Temperature - Vapour Phase (F),48.62,Final Mass of Vapour (lb),1.010e+005

Valve Outlet Minimum Temperature - Vapour Phase (F),48.62,Peak Vapour Flow Through Valve (lb/hr),2.279e+005

Inner Wall Initial Temperature - Vapour Phase (F),,Initial Mass of Liquid (lb),0.0000

Inner Wall Final Temperature - Vapour Phase (F),,Final Mass of Liquid (lb),0.0000

Inner Wall Minimum Temperature - Vapour Phase (F),,Peak Liquid Flow Through Valve (lb/hr),0.0000

Vessel Fluid Initial Temperature - Liquid Phase (F),90.00, ,

Total Depressuring – Flow (lb/hr): 236416.8