Dedicated Compression for Air Separation Plant Output
The 4ZW and 4MW series are reciprocating compressors designed specifically to integrate with the output of large-scale cryogenic air separation units (ASU). They pressurise the oxygen and nitrogen streams produced by the ASU to the working pressure required by downstream distribution pipelines or process systems.
These machines are not selected from a fixed catalogue. Each unit is specified and supplied against the process data sheet issued by the ASU licensor or engineering contractor — which determines inlet and outlet conditions, flow rate, motor power, cooling configuration and documentation requirements. Parameters published on this page are confirmed from factory product documentation only; all remaining specification is provided on enquiry.
For standard industrial oxygen pipeline boosting where fixed catalogue parameters apply, see our high-pressure oxygen booster compressors (30 bar). For primary-stage low-pressure output from PSA generators or small ASUs, see our low-pressure oxygen compressors (2–8 bar).
The following ranges apply to the complete 4ZW/4MW product line, not only to the two confirmed models on this page. Projects outside the confirmed models are handled on enquiry.
Two Models Confirmed from Factory Documentation
Parameters shown are confirmed from factory product documentation. Motor power, weight, dimensions and compression stages are process-dependent and provided on enquiry. We do not publish estimated values.
Where Large-Scale ASU Compressors Are Installed
Cryogenic air separation is the dominant production method for large-volume industrial oxygen and nitrogen. The 4ZW and 4MW series serve the three main deployment contexts for large-scale ASU installations.
Large chemical complexes — including coal-to-chemicals, methanol, ammonia synthesis and partial oxidation (POX) plants — operate dedicated ASUs producing oxygen at volumes that make cryogenic separation the only viable supply method. EPC contractors specify these compressors to API 618 against formal process data sheets, requiring full documentation packages. The 4MW-93/35 at 3.5 MPa is representative of the outlet pressures encountered in these applications.
Dedicated industrial gas production facilities operate large cryogenic ASUs as their core production asset, selling oxygen and nitrogen to industrial customers via pipeline or cylinder distribution. Both oxygen and nitrogen streams require separate compression trains — the 4ZW and 4MW series are compatible with either gas. The 4ZW-84/30 at 3.0 MPa is a representative configuration for oxygen compression in a mid-to-large gas production plant.
What We Need — and What We Return
Because both the 4ZW-84/30 and 4MW-93/35 are supplied against process conditions, a complete technical proposal requires process data. The ASU compressor data sheet from your licensor or engineering contractor is the standard starting document.
Send your ASU compressor data sheet and we will return a complete technical proposal. If you are at early project stage without a formal data sheet, send us your known process parameters and we will advise on what additional information is needed.
Send Process Data Sheet [email protected]40 Years Dedicated to Air Separation Compressor Engineering
Jiangxi Gas Compressor Co., Ltd. has been dedicated to cryogenic distillation air separation, PSA and VPSA compressor systems since the 1980s. The company is one of the primary Chinese manufacturers of reciprocating oxygen, nitrogen and hydrogen compressors, with long-term supply relationships with domestic and international air separation plant manufacturers, engineering contractors and industrial gas companies.
Products are designed to API 618 and applicable Chinese national standards. The company holds ISO 9001 certification and serves as Deputy Chairman unit of the China Compressor Industry Association. All units are factory performance-tested before shipment.
Common Questions
Other Oxygen Compression Products
ZW/LW/DW/4MW catalogue machines with fixed parameters. 4–100 m³/min. 55–1,200 kW. 380V or 6/10kV.
Low-pressure oxygen compressors for ASU primary output and PSA distribution. 0.7–150 m³/min. models in this range.
ZW oil-free cylinder filling compressors. 60–300 Nm³/h. Medical and industrial service.