Water Seals (Liquid Seals) provide a positive means of flash-back prevention in addition to enabling the upstream flare system header to operate at a slight positive pressure at all times. This is especially of use when an elevated flare is used in combination with another flare or with a flare gas recovery system.
The Water Seal (Liquid Seal) vessel is fitted with a special saw-tooth dip leg and anti-pulsation baffle to minimise pulsing. Within the Water Seal, the water level is preferably maintained by a constant overflow weir in combination with a suitable 'S' bend drainpipe. Filling rates will be sufficient to re-establish the seal within 5 minutes if the liquid seal is broken.
he Water Seal vessel may be equipped with an internal steam coil / sparger for winterisation purposes as required.