Ethylene Compressor segmentation by type delineates four principal architectures: reciprocating, rotary, screw, and centrifugal units. Reciprocating compressors dominate the high‑pressure niche, offering superior volumetric efficiency for feed‑stock compression up to 30 MPa; they account for roughly 35 % of total installed capacity, driven by their reliability in petrochemical complexes. Rotary compressors, encompassing both lobe and vane designs, provide continuous flow at moderate pressures (5–15 MPa) and represent about 25 % of the market, favored for their compact footprint and lower maintenance intervals. Screw compressors, characterized by twin‑screw rotors, deliver steady mid‑range pressure with high gas‑oil compatibility, contributing approximately 20 % of the market value, particularly in integrated ethylene chains where oil‑free operation is critical. Centrifugal compressors, optimized for large‑scale, low‑to‑medium pressure applications, capture the remaining 20 % and are increasingly adopted in new greenfield projects because of their energy‑efficiency and reduced acoustic emissions. Collectively, these type categories define the structural foundation of the Ethylene Compressor market.