Method for producing a system for the realization of an air separation process, Method for producing an air separation unit and air separation plant by cryogenic distillation

In a method for producing a system for conducting a process for separating air by cryogenic distillation, at least one gas of the air is obtained as product by air separation in a cold box (BF) comprising at least one column, the cold box is supplied with air at a first pressure in N air compressors (C1, C2, C3) compressing air from ambient pressure to the first pressure, the first pressure being greater 12 abs and less than 35 bar abs bars, N being equal to or greater than 3 and the total power of N compressors being greater than 10MW, a group of n compressor models being preset, n being equal to 2 or 3 or 4 or 5, each model having predefined characteristics and the N compressors being selected so that every N compressors are of a type selected from the group of n models.