A method for storage and transport of liquefied petroleum gases on LPG carriers, comprising compressing boil off gas emitted from one or more LPG cargo tanks, said LPG having a boiling point temperature of -110°C or higher at 1 atmosphere in a cargo compressor with minimum two stages of compression (100, 110, 120), providing at least one intermediate pressure stream (2, 4), at least one further cooled, compressed stream (3, 5), and a final compressed stream; cooling and condensing said final compressed stream in a cargo condenser to provide a high pressure condensate stream which enters a liquid receiver for separation of any non-condensable gases and mixing of gas and liquid; characterized in comprising the steps of: - cooling a warm and mixed two-phase stream leaving the receiver in at least one condensate sub-cooler (150, 240), in which the warm and mixed two-phase stream is heat exchanged with at least one glide refrigerant (9, 19) thereby producing at least one further cooled condensate stream (8, 10); - separating any gas from the at least one further cooled condensate stream (8, 10) in a liquid drum separator; - dividing the further cooled condensate stream (8, 10) into a stream, which is sent to one or more liquid tight tanks, and at least one stream (18, 22), which is expanded to at least one mixed phase refrigerant stream (9, 19), which is introduced into the at least one condensate sub-cooler (150, 240) countercurrently heat exchanged with the warm and mixed two-phase stream; - passing the at least one mixed phase refrigerant stream (9, 19) leaving the condensate sub-cooler (150, 240) as at least one stream (11, 24) to at least one droplet separator (160, 260) for removal of any droplets, if present; - passing and mixing at least one stream (13, 14) leaving the at least one droplet separator (160, 260) with the at least one intermediate pressure stream (2, 4) from the cargo compressor with at least two stages of compression (100,110, 120) thus forming the at least one further cooled, compressed stream (3, 5). - cooling a warm and mixed two-phase stream leaving the receiver in at least one condensate sub-cooler (150, 240), in which the warm and mixed two-phase stream is heat exchanged with at least one glide refrigerant (9, 19) thereby producing at least one further cooled condensate stream (8, 10); - separating any gas from the at least one further cooled condensate stream (8, 10) in a liquid drum separator; - dividing the further cooled condensate stream (8, 10) into a stream, which is sent to one or more liquid tight tanks, and at least one stream (18, 22), which is expanded to at least one mixed phase refrigerant stream (9, 19), which is introduced into the at least one condensate sub-cooler (150, 240) countercurrently heat exchanged with the warm and mixed two-phase stream; - passing the at least one mixed phase refrigerant stream (9, 19) leaving the condensate sub-cooler (150, 240) as at least one stream (11, 24) to at least one droplet separator (160, 260) for removal of any droplets, if present; - passing and mixing at least one stream (13, 14) leaving the at least one droplet separator (160, 260) with the at least one intermediate pressure stream (2, 4) from the cargo compressor with at least two stages of compression (100,110, 120) thus forming the at least one further cooled, compressed stream (3, 5).