Abstract: Procedure for pumping liquid at high temperature through a pipe, characterized in that the liquid at high temperature is pressed, by means of a fluid at low temperature that is inert in relation to the liquid at high temperature, away out of a first reservoir that is mounted on an extremity of the pipe. The liquid at high temperature which is pressed out is taken up in a second reservoir that is mounted on the other extremity of the pipe, while the aforementioned fluid that is in the second reservoir, is let out, after a time the liquid at high temperature is now pressed out of this second reservoir and is taken up again in the first reservoir, and this by means of the aforementioned fluid that is now let out of the first reservoir and is pumped into the second reservoir. The pumping procedure including means to calculate a flow rate through the pipe via temperature and level indicators, taking into account expansion or contraction of the high temperature liquid.