Patent ID: 7513735

Claim:
Multistage centrifugal compressor having a tank which can be opened horizontally, comprising a lower semi-tank and an upper semi-tank, a shaft having a series of rotors and a series of stages each of which comprising, in turn, a series of lower semi-diaphragms and a series of upper semi-diaphragms, a lower half-ring and an upper half-ring which can be coupled to form a bearing ring, said lower half-ring being fixed internally to the lower semi-tank, and said corresponding upper half-ring being fixed to the upper semi-tank, wherein in each stage of the multistage centrifugal compressor, the lower semi-diaphragms are tightly constrained to one another by blocking means, to form a first pile of lower semi-diaphragms and, the corresponding upper semi-diaphragms are tightly constrained to one another by blocking means, to form a second pile of lower semi-diaphragms, and in that said first pile can be constrained to said lower half-ring and said second pile can be constrained to said upper half-ring.