A method of fractionating a hydrocarbon stream comprising at least a first hydrocarbon component to provide at least a first hydrocarbon component reservoir stream, said method comprising at least the steps of: - providing a hydrocarbon stream comprising at least a first hydrocarbon component; - separating the hydrocarbon stream in a first fractionation device to provide an overhead first hydrocarbon component stream and a first hydrocarbon component depleted bottoms stream; - cooling the overhead first hydrocarbon component stream to provide a liquefied first hydrocarbon component stream; - drawing a part of the liquefied first hydrocarbon component stream to provide a liquefied first hydrocarbon component reservoir stream; - cooling the liquefied first hydrocarbon component reservoir stream against a refrigerant stream to provide a cooled liquefied first hydrocarbon component reservoir stream and a warmed refrigerant stream; characterized in that the method further comprises: - reducing the pressure of the cooled liquefied first hydrocarbon component reservoir stream to provide a reduced pressure liquid first hydrocarbon component reservoir stream; - storing the reduced pressure liquid first hydrocarbon component reservoir stream in a liquid first hydrocarbon component reservoir at a first hydrocarbon component storage pressure of at most just above atmospheric pressure for use as a first refrigerant component make-up constituent for in at least one refrigerant circuit (1000,2000); - passing a first hydrocarbon component supply stream from the liquid first hydrocarbon component reservoir to the at least one refrigerant circuit (1000,2000), wherein the step of passing the first hydrocarbon component supply stream from the first liquid hydrocarbon component reservoir to the at least one refrigerant circuit (1000,2000) comprises: - heating the first hydrocarbon component supply stream to provide a warmed first hydrocarbon component stream; - passing the warmed first hydrocarbon component stream to the at least one refrigerant circuit (1000, 2000). - providing a hydrocarbon stream comprising at least a first hydrocarbon component; - separating the hydrocarbon stream in a first fractionation device to provide an overhead first hydrocarbon component stream and a first hydrocarbon component depleted bottoms stream; - cooling the overhead first hydrocarbon component stream to provide a liquefied first hydrocarbon component stream; - drawing a part of the liquefied first hydrocarbon component stream to provide a liquefied first hydrocarbon component reservoir stream; - cooling the liquefied first hydrocarbon component reservoir stream against a refrigerant stream to provide a cooled liquefied first hydrocarbon component reservoir stream and a warmed refrigerant stream; - reducing the pressure of the cooled liquefied first hydrocarbon component reservoir stream to provide a reduced pressure liquid first hydrocarbon component reservoir stream; - storing the reduced pressure liquid first hydrocarbon component reservoir stream in a liquid first hydrocarbon component reservoir at a first hydrocarbon component storage pressure of at most just above atmospheric pressure for use as a first refrigerant component make-up constituent for in at least one refrigerant circuit (1000,2000); - passing a first hydrocarbon component supply stream from the liquid first hydrocarbon component reservoir to the at least one refrigerant circuit (1000,2000), - heating the first hydrocarbon component supply stream to provide a warmed first hydrocarbon component stream; - passing the warmed first hydrocarbon component stream to the at least one refrigerant circuit (1000, 2000).