Years ago I have seen a flooded evaporator (brine chiller) on a ship with an oil recovery system using an oil lift.
That came from the Stall or Sabroe stable and it was used to recover oil from the R22 (?) separator.
I think to remember that it was a communicating pipe with the separator
The oil leg was heated (a pipe in pipe heat exchanger with the liquid line?) and at an angle of about 30-45 degree.
Oil supost spilling over in the suction line by force of gravity.
Who knows about them and what design criteria and controls were used (if any).