Old vacuum systems had 10 liquid ring pumps and 2 blowers. Total power consumption of the vacuum system was 3900 kW and SEC was 76 kWh/t. Now after short optimization period total energy consumption is 1800 kW / SEC 35 kWh/t. Total energy saving is over 17 GWh/year or 1,7 MEUR/a.
Europac Viana do Castelo mill is located in North parts of Portugal. Viana PM4 is one of the bigger virgin fiber krafliner machines in Europe. Machine is 6,4-meter-wide and produces almost 400 000 t kraft paper a year.