EP-CM110G Water-Lubricated Oil-Free Screw Air Compressor for PET Bottle Blowing

Ultra-High Volumetric Efficiency

Water injected into the compression chamber fills and seals the micro-clearances between the screw and housing that in dry compressors represent leakage losses. This sealing effect raises the volumetric efficiency of the EP-CM110G's single air end to levels that would require a larger displacement air end in a dry design — allowing more actual usable air from the same physical compression geometry.

Single-Stage to 40 Bar — No Intercooler Loss

Multi-stage compression systems lose usable pressure at every stage boundary through intercooling and re-expansion. The EP-CM110G compresses air from atmospheric pressure to the target working pressure — up to 40 bar — in a single continuous stage. There are no intercooler pressure drops, no re-compression energy penalties, and no intercooler maintenance requirements.

110 kW Permanent Magnet Motor Efficiency

The 110 kW permanent magnet motor operates at 3–5% higher efficiency than equivalent asynchronous motors, converting a higher fraction of electrical input into shaft rotation. This motor efficiency advantage, combined with the direct coupling between motor and air end — no gearbox, no belt, no coupling losses — means the maximum available shaft power reaches the compression element with minimal transmission loss.

① Reliability — Low Speed, Low Bearing Load

Operating at ~3,000 rpm — half or less of twin-screw equivalents — the EP-CM110G's air end accumulates far fewer bearing cycles per operating hour. Combined with the balanced force geometry of the single-screw design, bearing fatigue failure is structurally minimized, contributing to the 25-year design service life.

② Energy — Isothermal Compression Advantage

Water lubrication maintains compression at near-ambient temperature, reducing the specific energy required to reach 40 bar by more than 10% versus adiabatic dry compression. Over a 25-year service life at 8,000 annual operating hours, this efficiency advantage translates to a substantial cumulative electricity cost reduction.

③ Low Noise — 72 dB(A) at 110 kW

Achieving 72 dB(A) at 110 kW output is a direct result of direct-drive motor connection (no belt or gear noise), low rotational speed (no high-frequency noise generation), and the CMN-patented air intake structure and soundproofing enclosure design. Equivalent reciprocating piston compressors at this output level typically exceed 90 dB(A).

④ Purity — Structural Class 0 Guarantee

The compression chamber contains no oil at any point in the operating cycle. Oil-free status is not dependent on filter performance, separator condition, or maintenance compliance — it is a structural property of the water lubrication design. TUV-verified ISO 8573-1 Class 0 certification covers oil content (0 ppm), particulates, and moisture.

⑤ Simplicity — One Air End, One Motor

A single air end driven by a single 110 kW motor means one set of compression bearings, one set of air intake filters, one water treatment circuit, and one control loop to manage. This simplicity reduces the number of potential failure points compared to multi-motor or multi-stage configurations and makes fault diagnosis faster and maintenance scheduling more straightforward.

⑥ Maintenance — Only Two Consumables

Daily maintenance of the EP-CM110G involves only air filter and water filter element replacement on the prescribed schedule. Star wheel blades manufactured from aviation-grade composite materials require service only at multi-year intervals. There are no oil changes, no oil-separator cartridges, no valve assemblies, and no piston rings anywhere in the system.

France — High-Speed CSD Bottle Producer

Industry: Carbonated Soft Drinks  |  Application: 40 bar continuous air supply for 16-cavity rotary blowing line at 42,000 BPH

"Our CSD line runs 20 hours per day at near-constant full speed — the demand profile is as stable as it gets in PET blowing. A fixed-frequency machine is the right choice for our operation, and the EP-CM110G's 10.2 m³/min gives us the headroom we need at 40 bar without over-specifying the installation. After 22 months, the compressor has not required any unplanned maintenance. The TUV Class 0 certification also satisfies our retailer compliance requirements without additional testing."

★★★★★

South Africa — Bottled Water Plant Expansion

Industry: Bottled Water  |  Application: 35 bar oil-free air for expanded 20-cavity rotary production line

"When we expanded our rotary blowing line from 12 to 20 cavities, our existing compressor system was undersized. The EP-CM110G was the first single-unit water-lubricated compressor with sufficient FAD to supply the expanded line without parallel units. The air-cooled configuration was essential for our facility, which lacks a cooling tower. Stable performance in our 35°C climate has been confirmed across two full summer seasons."

★★★★★

Vietnam — Edible Oil & Sauce Packaging Group

Industry: Food Packaging  |  Application: 38 bar oil-free air supplying three linear blowing lines producing edible oil and condiment bottles

"We evaluated whether to use one EP-CM110G or two smaller units. The single-unit option won on total cost of ownership — one control system, one water treatment circuit, one service contract. The 10.2 m³/min output comfortably covers all three of our linear lines simultaneously with margin. Food safety certification for our export markets required Class 0 oil-free documentation, which the TUV certificate from Ever Power provided immediately."

★★★★★