A typical single-stage turbine can contain up to 21 castings of different variations for the base design, while a typical multi-stage turbine can contain 30 castings or more.
The vibration amplitudes due to the critical speed of 2FW @ 147.1Hz reached 117.6 [micro]m over the axial compressor region and 58.1 [micro]m at the single-stage turbine disc.