| 摘要 |
PURPOSE:To allow such a manufacturing as having less remained stress at a welding part by a method wherein the central part of a turbine casing is divided into upper and lower parts, both of them are make integral with a welding operation to form a shell body and a separate flange is assembled to the shell body. CONSTITUTION:A cylindrical part 1 formed as a conical shape is divided into upper and lower parts and semi-circular support rings 4 and 5 for supporting an inner casing are fixed to their inner surfaces by a welding operation. To both ends of the upper and lower semi-cylindrical parts of the cylinder part 1 are fixed the divided parts of end plates 2 and 3. Each of the divided upper and lower parts is integrated by a welding operation to form a shell part of the turbine casing. To the shell part are welded the discharging pipes 11, 12, main steam pipe 6, extraction pipe 13 and regenerative pipe 14 to complete an entire shell part. A flange part 7 is composed of flange pieces 7a to 7d and packing rings 8 and 9. The flange part 7 is assembled to said shell part, integrated by a welding operation to complete the turbine casing. |
