Steam turbine

A steam turbine comprising:

• an outer casing;
• an annular member which is a single member provided on a radial inner side of the outer casing, and which is formed with a seal region in which a sealing device for sealing a gap between the member and an outer peripheral surface of a rotor is disposed, a rear-stage stator vane holding region that holds a rear-stage stator vane, and an inner casing region that connects the seal region and the rear-stage stator vane holding region;
• and
• a front-stage vane ring that is mounted on the annular member and that holds a front-stage stator vane,
• wherein a central axis of a pipe stand for supplying first steam to a first stator vane that is located on a most upstream side in an axial direction is located on an axial downstream side with respect to the first stator vane.

A steam turbine comprising:

• an outer casing;
• an annular member which is a single member provided on a radial inner side of the outer casing, and which is formed with a seal region in which a sealing device for sealing a gap between the member and an outer peripheral surface of a rotor is disposed, a rear-stage stator vane holding region that holds a rear-stage stator vane, and an inner casing region that connects the seal region and the rear-stage stator vane holding region;
• and
• a front-stage vane ring that is mounted on the annular member and that holds a front-stage stator vane,
• wherein the steam turbine is a medium-high pressure integrated type steam turbine which includes a high-pressure section and a medium-pressure section, and
• the high-pressure section includes the annular member and the front-stage vane ring.