• LPG - If too much LPG is allowed to leave overhead, it may condense in the gas processing unit and returned to the stabiliser column, creating a recycle (Fig. 1). Even if allowed for in the design through the presence of a fractionation unit in
the downstream line-up, it is an inefficient process to retain the condensate and
LPG product and it may therefore be preferred to install a refluxed column.