NOVELTY - Vapor is removed from a ullage of a storage vessel. The temperature of the vapor is reduced such that the liquids in the vapor condense by passing the vapor through a heat exchanger (78) cooled by an inert expandable gas. The condensed liquids are separated from the cold stream of vapor which is utilized to reduce the temperature of vapor between vapor removal process and temperature reduction process.    USE - For recovering volatile organic and inorganic compounds including hazardous air pollutants, from vessels such as barges that need vapor depressurizing for changing products or for human entry for servicing and/or inspection, liquid filling or liquid unloading.    ADVANTAGE - The recovery process recovers the vapors in sufficient purity to have value as fuel and/or for subsequent reuse, and recovers the inert gas in sufficient purity for recycling. The process utilizes the chilling effect of the nitrogen to reduce the temperature of the gases from separator while raising the temperature of the nitrogen. The process recovers very low vapor pressure products such as glycol vapor as well as very high vapor pressure products like propane and propene at up to 250 psig. Refrigeration loads and costs are reduced by additional compression which increases vapor pressure and lowers condensing pressure. The two stage heat exchangers are designed with sufficient surface area to process either high pressure or low pressure vapor economically. No special lubrication system is needed for third stage system and the air cooler has a design capacity to function as a higher duty condenser. The addition of pad gas prevents pulling a vacuum on the vessel and increases the efficiency of the pump used for removing liquid from the vessel.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for the apparatus for recovering vapor from ullage of a vessel during depressurizing, loading or unloading operations utilizing an inert gas.    DESCRIPTION OF DRAWING(S) - The figure shows the piping connections of the barge vapor flaring system.    Heat exchanger (78)