In modern refrigeration process plants the liquefaction of gases is achieved at high pressure to improve the overall efficiency of the cryogenic process. After the condensation of the refrigerated gas the pressurized liquefied gas is expanded across a liquid-vapor two-phase expander to a lower pressure suitable for storage and transportation of the liquefied gas. The expansion process generates a certain amount of vapor and the remaining liquid is cooled down. By employing a two-phase draft tube at the exit of the two-phase expander, an increase in the amount of liquid is accomplished. A discussion covers the fluid dynamic operation and the thermodynamic performance of two-phase draft tubes; expansion of saturated liquefied gas; and the amount of vapor at the outlet of the draft tube. This is an abstract of a paper presented at the 42nd Loss Prevention Symposium (New Orleans, LA 4/6-10/2008).