*These are recommended flow rates and are going to vary depending on the particular conditions on each application. Job site surroundings and several other factors can limit these rates. These rates are based on products being in a vapor state at the time of flaring. Exit Velocities are calculated according to API recommended practice, and will vary depending on the flare operator and job site conditions. Destruction efficiencies are those that are achieved when flare is operated correctly.
Product |
Recommended Max |
Exit Velocity (ft/sec) |
Destruction Efficiency (%) |
Ethane | 8 ; 4100 | 148 | 98 |
Propane | 6.7 ; 3888 | 124 | 98 |
Butane | 7.5 ; 3989 | 94 | 98 |
Ethylene | 9 ; 4078 | 148 | 98 |
Propylene | 7.7 ; 3933 | 124 | 98 |