Purging operations are usually realised on industrial units (tank, reactor, etc.) in order to maintain product quality (e.g., by using a dry sweep gas to minimise water vapour in system), to reduce concentrations of flammable vapours or also to purge all residual vapour from an installation.
Purge/gas sweep operations are realised:
Following picture present reactors with forced extractions (used for purging the headspace in order to maintain vapour concentration below the inferior explosive limit):
In order to evaluate atmospheric emissions during purging operations, Envmodels propose two calculation tools: