a production amount of 1500 admt day in this case an input of 0 68 tonne tonne of wood moisture is obtained that is 0 68 tonnes of wood moisture per tonne of chips accompanies the chips the arrangement can be adjusted such that the temperature of the impregnation fluid rec that is withdrawn lies around 30 u00b0 c the following standard amounts and temperatures apply in these operational conditions bl 1 105 u00b0 c and a flow of 2 85 tonne hour bl 2 125 u00b0 c and a flow of 1 5 tonne hour bl 3 132 u00b0 c and a flow of 1 5 tonne hour rec 30 u00b0 c and a flow of 0 96 tonne tonne i e 0 96 tonne fluid per tonne of chips a temperature of the mixture of approximately 117 u00b0 c is obtained under these conditions which together with the exothermic reaction with the black liquor which corresponds to a temperature rise of approximately 5 u00b0 c ensures a final temperature of approximately 122 u00b0 c of the chips when fed out from the impregnation vessel at this level of the flow in the counterflow zone z 1 which preferably lies within the interval 50 150 of the flow of chips calculated as a weight percentage i e that 0 50 1 50 tonnes of.