Abstract: In an outer casing of a low-pressure part of a steam turbine, the casing lower part (2) consists of a foundation (5) shuttering, the split plane between the casing upper part (1) and the casing lower part (2) is arranged parallel to and below the horizontal plane through the turbine center line and this split plane and the condenser connection (4) are component parts of the foundation (5). The lower part (2) of the outer casing is not a load-bearing element. The force from the condenser (3) is introduced directly into the foundation (5). The efficiency of the part of the turbine is increased.