Abstract: A system is provided for loading one or more transport tank, the system including one or more load lines for connecting between on-site storage tanks or vessels and the transport tanks; one or more vapour return lines for connecting between the transport tanks and an on-site flare or downstream units; an oxygen deficient medium source; one or more oxygen deficient medium blend supply lines connectable to each of the vapour return lines; a HMI/PLC for automation and control of the operations of the system; and a control panel in communication with the HMI/PLC for starting and stopping operation of the system. Gases displaced from the transport tanks during loading can be sent directly to flare or downstream units. A method is also provided for loading a fluid from one or more on-site storage tanks or vessels to one or more transportation tanks.