NOVELTY - The compressor (58) has a removable cartridge (62) detachably attached to a casing (60) and including a shaft rotated about a horizontal axis (74), which is perpendicular to a vertical axis (72), where the casing is vertically splitted along the vertical axis. A bearing system is attached to the cartridge and rotationally supports an end of the shaft. A set of blades placed towards another end of the shaft such that the latter end is overhung inside the casing. A guide vane mechanism (66) is connected to the cartridge and adjusts a flow of fluid to the blades.    USE - Overhung axial compressor for use in a chemical reactor that is utilized for handling a chemical substance e.g. ethylene oxide, ethylene glycol, natural gas, Propane/Propylene splitter, polyethylene and polypropylene (all claimed), in a chemical and petrochemical industry i.e. polyethylene/polypropylene industry, plastics industry and multiphase pipelines industry.    ADVANTAGE - The casing achieves smaller weight and size for a desired high flow coefficient that is greater than approximately 0.2, low polytropic head applications and improved performance. The cartridge is provided with a dry gas seal to prevent the fluid entering at inlet to escape to the atmosphere, so as to easily service the moving parts of the compressor in a timely and cost-effective manner. The compressor allows buffer gas to provide higher pressure in various cavities and to prevent the process gas with its particles from entering and building up inside the cavity or space. The compressor provides a radial inlet/axial discharge for simplified reactor piping connection, and a modular assembly of the cartridge to the casing for eliminating a need for pipe removal.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a chemical reactor for handling a chemical substance    (2) a method for making an overhung axial compressor.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of an overhung axial compressor.    Overhung axial compressor (58)    Casing (60)    Removable cartridge (62)    Guide vane mechanism (66)    Vertical axis (72)    Horizontal axis (74)