Compressor system and bundle movement method

A bundle movement method for a compressor system, the compressor system comprising:

• a drive shaft that rotates around an axis;
• a high-pressure compressor that is driven by transmission of rotation of the drive shaft and configured to compress a fluid;
• and
• a low-pressure compressor disposed on an opposite side of the driving machine with the high-pressure compressor interposed therebetween in an axial direction in which the axis extends and driven by transmission of rotation of the drive shaft, wherein
• the high-pressure compressor includes
• a high-pressure bundle including a high-pressure rotor shaft that rotates around the axis together with the drive shaft and a plurality of high-pressure impellers, and
• a high-pressure casing configured to accommodate the high-pressure bundle and is formed in a tubular shape centered on the axis, and
• the low-pressure compressor includes
• a low-pressure bundle including a low-pressure rotor shaft that rotates around the axis together with the drive shaft and the high-pressure rotor shaft and a plurality of low-pressure impellers, and
• a low-pressure casing configured to accommodate the low-pressure bundle and is formed in a tubular shape centered on the axis, and
• when viewed from the axial direction, a minimum inside diameter of the low-pressure casing is larger than a maximum outside diameter of the high-pressure bundle, the bundle movement method comprising:
• moving the high-pressure bundle in the inside of the low-pressure casing and a position of the high-pressure bundle in the axial direction overlaps a position of the low-pressure casing in the axial direction in a state in which the low-pressure casing is fixed on a base plate.