EP-ZW-9.5/3 Oxygen Air Compressor — Outdoor Explosion Proof Model

Certified Outdoor Explosion-Proof Design

The EP-ZW-9.5/3 oxygen air compressor is specifically engineered and certified for outdoor installation in hazardous classified zones where oxygen-enriched atmospheres can accumulate. With an ATEX/IECEx Group IIA/IIB Zone 1-rated motor and explosion-proof electrical components throughout, this oxygen air compressor can be installed in open-air filling yards, rooftop plant areas, and outdoor oxygen generation facilities without the capital cost of a separately ventilated compressor room — a meaningful advantage for gas distributors and hospital oxygen supply projects in France and globally.

Three-Stage Compression to 3.0 MPa

Achieving 3.0 MPa from atmospheric pressure in a single stage would generate cylinder temperatures that make oxygen compression hazardous. The three-stage design of the EP-ZW-9.5/3 oxygen air compressor limits the temperature rise per stage through intercooling, keeping compression temperatures within the safe operating envelope for oxygen service at each point in the cycle. This staged approach is the international standard for industrial oxygen air compressor designs at pressures above 1.5 MPa, and the EP-ZW-9.5/3 implements it with dedicated oxygen-compatible intercoolers between every stage.

Zero Hydrocarbon Oil in the Gas Path

The oil free oxygen air compressor design ensures no hydrocarbon lubricant contacts the compressed oxygen at any point. PTFE-composite rings and rider rings provide all necessary gas sealing in each cylinder stage, and a sealed, vented distance piece prevents crankcase oil migration. This hydrocarbon-free guarantee is not just a product feature — it is a fundamental safety requirement for oxygen compression, eliminating the primary ignition mechanism that causes oxygen compressor fires and explosions in improperly specified oil-lubricated machines.

Compact ZW-Frame for Space-Constrained Sites

At just 1845 mm × 1660 mm × 2360 mm and 3.50 tonnes, the EP-ZW-9.5/3 delivers 9.5 m³/min at 3.0 MPa from a footprint that fits in spaces where larger D-type or M-type frames would be impractical. The vertical-cylinder ZW configuration also simplifies overhead crane access to cylinder heads for piston ring maintenance, reducing planned downtime at facilities where oxygen supply continuity is critical. For oxygen plant air compressor installations in urban hospital environments or compact industrial gas distribution yards, this compact profile is a practical specification advantage.

◆ Medical Oxygen Cylinder Filling Stations

Hospitals, medical gas distributors, and home-care oxygen suppliers fill high-pressure oxygen cylinders (typically 150–200 bar) for patient use. The EP-ZW-9.5/3 oxygen air compressor functions as the high-pressure booster in an oxygen filling station, receiving cryogenic oxygen or PSA-generated oxygen at low inlet pressure and boosting it to the manifold pressure required for cylinder filling. The outdoor explosion-proof rating allows the filling station to be sited in a yard adjacent to the cylinder storage bay — the most practical layout for a medical gas facility — without requiring a separately ventilated compressor building. In France, medical oxygen air compressor filling is regulated under ANSM guidelines and EN ISO 7396-1; the EP-ZW-9.5/3 is designed to meet these requirements.

◆ Industrial Oxygen Production Plants

Air separation units (ASU), pressure swing adsorption (PSA) plants, and vacuum pressure swing adsorption (VPSA) systems produce oxygen at low pressure — typically 0.05–0.15 MPa above atmospheric. An industrial oxygen air compressor is required to boost this output to distribution or process pressures. The EP-ZW-9.5/3 compresses PSA or VPSA-generated oxygen to 3.0 MPa for pipeline distribution, cylinder filling, or direct process injection. Its oil-free oxygen compressor design protects the purity of the oxygen product from the generation unit, ensuring the output meets the specification of the downstream customer or process requirement throughout the booster compression step.

◆ Oxygenation in Wastewater & Aquaculture

Large wastewater treatment plants and intensive aquaculture facilities inject oxygen directly into biological reactors or fish tanks to accelerate biological oxygen demand (BOD) reduction or maintain dissolved oxygen levels for fish growth. At the pressures required for deep injection systems (1.5–3.0 MPa), a dedicated o2 compressor is needed. The EP-ZW-9.5/3 oxygen air compressor provides the volume and pressure for these environmental and agricultural oxygen injection systems, and its outdoor rating suits the typical open-air installation environment of a wastewater plant or aquaculture facility in France, the Netherlands, or Southeast Asia.

◆ Steel & Metal Cutting (Oxygen-Enhanced Combustion)

Steel manufacturers and metal fabrication facilities use high-purity oxygen to enhance combustion in blast furnaces, electric arc furnaces, and oxy-fuel cutting systems. The EP-ZW-9.5/3 supplies compressed oxygen to cutting manifolds and process injection points at the 3.0 MPa pressure level required by high-capacity oxy-fuel cutting equipment. For steelworks and metal processing sites in France's industrial heartland — Lorraine, Dunkirk, and Fos-sur-Mer — where oxygen supply reliability directly determines production continuity, this outdoor-rated compressor provides a dependable, field-serviceable supply point.

◆ Petrochemical & Chemical Oxidation Processes

Chemical production processes including partial oxidation, epoxidation, and oxidative dehydrogenation require compressed oxygen at controlled pressure as a process reactant. The oil free oxygen air compressor design of the EP-ZW-9.5/3 ensures that no hydrocarbon contamination from the compression stage enters the sensitive chemical process stream, where hydrocarbon traces could affect catalyst performance or product quality. In French petrochemical clusters such as the Étang de Berre and Seine-et-Marne chemical parks, the ATEX-certified outdoor explosion-proof rating of this machine is a prerequisite for hazardous-area installation.

◆ Glass Manufacturing & Oxy-Fuel Furnaces

Modern float glass and container glass furnaces increasingly use oxy-fuel firing to replace air-fuel combustion, reducing NOx emissions and improving thermal efficiency. High-purity oxygen at 2.5–3.5 MPa is required for the oxygen lances and injectors in these furnaces. The EP-ZW-9.5/3 oxygen compressor machine serves this application by boosting oxygen from the plant's supply header to the pressure required by the furnace combustion system, helping glass manufacturers in France and Europe meet the NOx emission limits set by the Industrial Emissions Directive (IED) 2010/75/EU without capital-intensive stack treatment systems.

ISBM Machine — One-Step Injection Stretch Blow Moulding

For PET packaging operations that rely on compressed air from our compressor range, an ISBM machine from our portfolio provides the bottle-forming equipment side of the system. In facilities where both oxygen and air compressors are installed — such as glass or food-processing sites with oxygen-enhanced combustion and packaging air supply — being able to source the blow-moulding system and compressor equipment from a single organisation with unified technical documentation is a meaningful operational simplification.

Three Phase Asynchronous Motor

The 110 kW explosion-proof motor driving the EP-ZW-9.5/3 is sourced from our own three-phase asynchronous motor production range, available in standard and explosion-proof (ATEX/IECEx) configurations. Matching the motor to the compressor at the manufacturing level eliminates shaft and flange compatibility concerns, simplifies the explosion-proof zone documentation package for ATEX classification purposes, and provides a single warranty and technical support contact for the entire drive train. Our explosion-proof motor range covers 380 V, 6 kV, and 10 kV versions across all compressor power classes in the oxygen and air compressor product families.