Abstract: The embodiments relate to a steam turbine with modular inserts that are removably insertable into an inner case. The modular inserts include a seal carrier modular insert located towards a first end of the steam turbine, for carrier seals located between the inner casing the rotor, that is cylindrically shaped and removably insertable into the inner casing, an inlet spiral insert, adjacent the seal carrier modular insert and removably insertable into the inner casing, for introducing steam into the steam expansion flow path so as to circumferentially distribute steam feed into the steam turbine; and a blade carrier modular insert, adjacent the inlet spiral insert, that is also cylindrically shaped and removably insertable into the inner casing, for retaining stationary blades.

Abstract: The disclosure relates to a steam turbine outer casing that can be at least partially cast out of a first material and has a plurality of support regions adapted to support an inner casing. The outer casing can be at least one support region that has a metal insert, made of a second material, with a flaring portion for retaining the metal insert in the casting of the outer casing. The second material has a greater hot strength than the first material. The support region can include a guide for limiting the movement of the inner casing in the outer casing.

Abstract: A diffuser is described with an entry section close to the last stage of a turbine having an outer wall including several subsequent straight wall parts at an angle to each other followed by a curved wall part with the curved wall part connecting the straight wall parts to a diffuser lip or exit and having as vertical cross-section a non-circular 2nd order curve, preferably part of an elliptic curve.

Abstract: The disclosure relates to a steam turbine outer casing that can be at least partially cast out of a first material and has a plurality of support regions adapted to support an inner casing. The outer casing can be at least one support region that has a metal insert, made of a second material, with a flaring portion for retaining the metal insert in the casting of the outer casing. The second material has a greater hot strength than the first material. The support region can include a guide for limiting the movement of the inner casing in the outer casing.