Fluids containing wet hydrocarbons, such as disposal from offshore receiving facility, acid gas removal, dehydration/mercury removal, debutanizer and condensate stabilizer is disposed to wet flare.
While dry flare system will handle liquid and vapour discharges from sources that contain no water or CO2 to avoid freezing in the flare system. Usually this stream comes from refrigeration unit, fractionation unit, gas liquefaction.
This link can be useful
http://www.hydrocarb...se-history.html
A wet flare header is used to handle flare gases that contain moisture but are not “cold” gases.
• An intermediate flare header, which could contain some moisture and normally handles some cold vapors (up to –45°C).
• A dry flare header designed to handle dry flare gases. These will also be cold, with normal temperatures below –45°C.