Outotec Finland Oyj ordered for Boliden in Kokkola, steel frames to six reactors, which when filled weighed 650 tons. The circular stands consists of 500 mm high custom made H-beams, each weighing over 11 tons. The tolerance with regard to the precision of the construction was very small. Here the timetable was extremely tight as well. The process needed to be started up at a given date and the loadbearing frames needed to be in place at that time.