EP-CM55BF Water-Lubricated Oil-Free Screw Air Compressor
The EP-CM55BF is a 55 kW fixed-frequency water-lubricated oil-free screw compressor delivering up to 8.60 m³/min at 0.8–1.25 MPa — a large industrial model serving hospital medical air systems, high-speed textile mills, nonwoven production lines, and heavy continuous industrial processes demanding Class 0 air at sustained high volume.
EP-CM55BF | 55 kW Water-Lubricated Oil-Free Compressor — 8.60 m³/min for Critical Industrial Processes
Certain industrial applications place compressed air quality requirements that go beyond production quality considerations into the domain of safety and regulatory compliance. Hospital medical air systems must deliver oil-free compressed air that is safe for patient respiratory contact. Textile operations producing healthcare or food-contact nonwoven fabrics must guarantee oil-free fibre drawing air to prevent contamination of finished products that will contact patients or food. These applications demand not just high-quality compressed air, but a technology basis for that quality that can be validated, documented, and maintained consistently across a long operational life.
The EP-CM55BF provides that technology basis at 55 kW scale. Delivering 8.60 m³/min (304 cfm) of ISO 8573-1 Class 0 oil-free compressed air at pressures up to 1.25 MPa, with a noise level of 70 dB(A) and a discharge temperature of 45–55°C that simplifies downstream medical air drying, it serves hospital compressed air systems, large textile mills, nonwoven production lines, and heavy continuous industrial processes from a single water-lubricated unit. Review the full CMB product range to compare with adjacent models.
Technical Specifications
| Parameter | 0.8 MPa | 1.0 MPa | 1.25 MPa |
|---|---|---|---|
| Motor Power | 55 kW / 75 HP | 55 kW / 75 HP | 55 kW / 75 HP |
| FAD (m³/min) | 3.44–8.60 | 3.48–8.60 | 2.97–7.42 |
| FAD (cfm) | 121–304 | 123–304 | 105–262 |
| Noise Level | 70 dB(A) | 70 dB(A) | 70 dB(A) |
| Weight W-cooled | 2050 kg | 2050 kg | 2050 kg |
| Weight A-cooled | 1550 kg | 1550 kg | 1550 kg |
| Dimensions W-cooled (mm) | 3040×1280×1800 | 3040×1280×1800 | 3040×1280×1800 |
| Dimensions A-cooled (mm) | 2200×1350×1530 | 2200×1350×1530 | 2200×1350×1530 |
| Air Quality | ISO 8573-1 Class 0 | ISO 8573-1 Class 0 | ISO 8573-1 Class 0 |
| Lubrication | Pure water — zero oil | Pure water — zero oil | Pure water — zero oil |
Hospital Medical Air: Why Structural Oil-Free Status Is the Required Foundation
ISO 7396-1, the international standard governing medical gas pipeline systems, specifies that medical compressed air must be produced by oil-free compressors — the standard requires oil-free technology at the source, not oil removal from an oil-containing supply. The EP-CM55BF's water-lubricated single-screw design satisfies this requirement structurally: no oil enters the compression circuit at any point, so the compressed air produced by the machine is inherently free of any lubrication oil contamination before it reaches the downstream medical air treatment system.
Beyond the regulatory basis, the EP-CM55BF's 70 dB(A) noise level is significantly more compatible with hospital building acoustic requirements than equivalent piston medical air compressors, which typically produce 85–95 dB(A) and require specialist soundproofed plant rooms. The 45–55°C discharge temperature also simplifies the medical air dryer sizing and desiccant selection — lower inlet temperature enables more efficient drying to the -40°C to -70°C pressure dew points required for surgical suite compressed air.
Key Features
8.60 m³/min — Hospital and Large Textile Scale
At 8.60 m³/min (304 cfm), the EP-CM55BF supplies a large hospital medical air network with concurrent demand from operating theatres, ICU ventilators, and ward services, or a large textile mill with 25–30 air-jet looms running simultaneously, from a single water-lubricated machine with one maintenance schedule.
Structurally Validated Oil-Free for Medical Applications
TUV-verified ISO 8573-1 Class 0 certification covers oil content (0 ppm), particulates, and moisture. The structural basis — water lubrication contains no oil — provides the validation pathway for medical air qualification that is not available from filter-dependent systems: the source of the oil-free status is the machine design, not the downstream treatment train.
70 dB(A) — Hospital-Compatible Noise
At 70 dB(A), the EP-CM55BF is significantly quieter than equivalent piston medical air compressors and compatible with hospital technical services building acoustic norms in most jurisdictions. Direct installation in standard plant rooms without specialist acoustic enclosures reduces installation cost and simplifies plant room design.
Low Discharge Temperature — Efficient Medical Drying
The 45–55°C discharge temperature reduces the moisture load entering the medical air dryer by a factor of three to four compared to a 200°C adiabatic compressor discharge. This directly improves dryer efficiency, reduces desiccant consumption, and lowers the energy cost of achieving the low pressure dew points required for medical air.
Zero Contaminated Condensate
No oil-contaminated condensate is produced. For hospital facilities subject to strict waste management protocols, the elimination of oil-contaminated compressor condensate removes a regulated waste stream from the facility's environmental compliance scope. The water condensate produced by the air dryer downstream of the EP-CM55BF is clean and can be disposed of via standard drain connections.
Continuous 7×24 Medical Grade Operation
Hospitals require compressed air systems that can sustain continuous 7×24 operation without scheduled downtime. The EP-CM55BF's isothermal operating temperature — ambient +15°C throughout continuous operation — prevents the thermal fatigue that limits some compressor designs under sustained duty, and the 25-year air end design life exceeds the planning horizon of most hospital capital equipment programmes.
Customer Case Studies
United Kingdom — NHS Hospital Trust
Industry: Healthcare | Application: Medical compressed air supply for surgical suites, ICU, and respiratory therapy departments
"Compliance with HTM 02-01 (medical gas pipeline systems) requires structural oil-free source technology. The EP-CM55BF's water-lubricated design and TUV Class 0 certification satisfied our medical gas validation engineer's requirements directly. The 70 dB(A) noise level allowed installation in a standard plant room adjacent to clinical areas — avoiding the specialist acoustic construction our previous piston compressor required. Medical air system uptime in 26 months of operation: 99.99%."
★★★★★
Bangladesh — Large Textile Weaving Mill
Industry: Textile Manufacturing | Application: Oil-free compressed air for 28 air-jet looms weaving high-count cotton fabric for export markets
"Export fabric standards for our EU customers require oil-free compressed air documentation at the weaving stage. Our previous multi-compressor installation — three piston units plus oil filtration — was failing to consistently meet Class 1 oil content at every filter check interval. The EP-CM55BF replaced all three units with structurally Class 0 oil-free air from one machine. Fabric oil contamination defects have been zero since installation. Annual maintenance costs are 70% lower than the three-unit system."
★★★★★
Turkey — Nonwoven Hygiene Products Manufacturer
Industry: Nonwoven Production | Application: Oil-free process air for spunbond fibre drawing and meltblown web formation
"Our nonwoven products are used in medical and hygiene applications — baby diapers, surgical drapes, and wound care. Oil contamination of fibre drawing air is a product safety issue, not just a quality issue. The EP-CM55BF provides the structural oil-free guarantee we need to support our product safety documentation. The 8.60 m³/min output covers our entire spunbond line at full production speed, and the low discharge temperature is beneficial for our fibre drawing process temperature control."
★★★★★
Frequently Asked Questions
Medical Grade Purity. Industrial Scale Output.
NHS trusts, textile mills, nonwoven manufacturers, and continuous process facilities in the UK, Bangladesh, Turkey, and 50+ markets depend on Ever Power 55 kW water-lubricated technology for critical-purity compressed air at industrial scale. Contact our team for a complete system assessment and qualification support.
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