Definition(s)
Velocity Seal
Dry vapor seal based on a flow restriction that minimizes the required purge gas needed to protect against air infiltration into the flare burner exit.
Source: API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global Standards
Velocity Seal
Dry vapour seal that minimizes the required purge gas needed to protect against air infiltration into the flare burner exit.
Source: API STD 521, Pressure-relieving and Depressuring Systems, Fifth Edition, January 2007 (Addendum May 2008). Global Standards