The present invention relates to an auxiliary system for starting or restarting the flow of gelled fluid contained in a pipeline (12) wherein the system comprises: at least one relief tank (13) fluidly connected (11) to the pipeline (12), wherein at least one relief tank (13) is suitable for receiving fluid from the pipeline (12); and at least one pressurising element upstream of at least one tank, suitable for pressurising the fluid in the pipeline (12), Additionally, the invention also provides an auxiliary method for starting or restarting the flow of gelled fluid in a pipeline (12) comprising at least one tank fluidly connected (11) to the pipeline (12) and at least one pressurising element upstream of at least one tank, wherein the method comprises the step of, at the start of the process, the pressurising element increasing the pressure in the pipeline (12) and filling at least one tank at least partially with fluid coming from the pipeline (12).