EP-CM250B Water-Lubricated Oil-Free Screw Air Compressor
The EP-CM250B is a 250 kW water-lubricated oil-free screw compressor delivering up to 42.88 m³/min at 0.8–1.25 MPa — an extra-large industrial model for major shipyards, large chemical processing complexes, data centre infrastructure, and high-volume continuous industrial utilities where Class 0 oil-free air is required at the 40+ m³/min scale.
EP-CM250B | 250 kW Water-Lubricated Oil-Free Compressor — 42.88 m³/min for Extra-Large Industrial Utilities
The largest single-machine compressed air demands in industrial infrastructure arise in contexts where scale, geographic spread, and simultaneous multi-user operation combine to create aggregate air consumption figures that challenge even large compressor units. Major shipyards supplying tools across multiple vessel berths, large chemical complexes with instrument air networks extending across hundreds of process nodes, data centres with extensive pneumatic infrastructure for cooling system actuation, and food production campuses with dozens of simultaneous process lines — these facilities sit in the operational territory where individual compressor capacity becomes a limiting factor for how efficiently the compressed air infrastructure can be designed and managed.
The EP-CM250B extends the CMB water-lubricated series into this territory. At 250 kW (340 HP) with a peak free air delivery of 42.88 m³/min (1,514 cfm) at 0.8 MPa, it provides the output to supply major industrial utilities as one or two central units rather than the larger banks of smaller compressors that would otherwise be required. The structural ISO 8573-1 Class 0 oil-free guarantee, isothermal energy efficiency, and 25-year design service life apply at the same standard as every other CMB series model — scale increases the importance of each of these advantages without diminishing any of them. Visit the complete CMB series for the full output range.
Technical Specifications
| Parameter | 0.8 MPa | 1.0 MPa | 1.25 MPa |
|---|---|---|---|
| Motor Power | 250 kW / 340 HP | 250 kW / 340 HP | 250 kW / 340 HP |
| FAD (m³/min) | 17.15–42.88 | 15.60–39.00 | 13.87–34.64 |
| FAD (cfm) | 606–1514 | 551–1377 | 490–1223 |
| Noise Level | 78 dB(A) | 78 dB(A) | 78 dB(A) |
| Weight | 3900 kg | 3900 kg | 3900 kg |
| Dimensions (mm) | 3100×1700×2090 | 3100×1700×2090 | 3100×1700×2090 |
| 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 |
Shipyard Operations: 42 m³/min Across a Major Vessel Construction Facility
A major shipyard during vessel outfitting operations is among the most demanding compressed air environments in manufacturing. Multiple trades — pipefitters, painters, electricians, and structural workers — work simultaneously across different decks of the same vessel, each using pneumatic tools that draw from a shared distribution network supplied by the central compressor station. Peak demand during intensive outfitting periods can exceed 35–40 m³/min from a single berth.
The EP-CM250B's 42.88 m³/min output provides single-unit coverage for this demand level, including capacity margin for peaks and simultaneous tool use across multiple decks. The oil-free air quality matters specifically in shipyard painting applications — where oil contamination of spray air causes coating adhesion failures and corrosion protection deficiencies that can affect vessel classification survey outcomes. The structural Class 0 guarantee ensures that painting air quality is consistent regardless of which part of the working day or week the painting operation occurs.
Key Features
42.88 m³/min — Extra-Large Industrial Coverage
At 42.88 m³/min (1,514 cfm), the EP-CM250B serves as the central supply for major shipyard berths during outfitting, large integrated chemical complex instrument air networks, data centre mechanical system infrastructure, and large food production campuses with many simultaneous process air users — providing this volume from a single machine in a 3100×1700×2090 mm footprint.
Same Footprint as EP-CM200B — 27% More Output
The EP-CM250B shares the same 3100×1700×2090 mm dimensions and approximately the same weight (3900 kg vs 3750 kg) as the EP-CM200B, while delivering 27% more free air delivery at 0.8 MPa (42.88 vs 36.63 m³/min). For facilities where equipment room space is constrained, this output density is a significant practical advantage — more air from the same floor space.
200,000 kWh Annual Isothermal Energy Saving
At 250 kW and 8,000 annual operating hours, the 10%+ specific power advantage of isothermal compression represents approximately 200,000 kWh of annual electricity saving versus dry adiabatic alternatives — a very large absolute saving that makes the water-lubricated technology premium recoverable within the first one to two years of operation at typical industrial electricity rates.
Structural Class 0 for Large-Scale Process Safety
In large chemical complexes where instrument air serves safety-critical shutdown systems across hundreds of control loops, and in shipyards where coating air quality determines long-term corrosion protection performance, the structural Class 0 guarantee — no oil in the compression circuit — provides a quality assurance basis that scales with the consequences of contamination. One compressor, one structural guarantee, covering every user on the system.
AI-Optimised Multi-Unit Station Capability
Multiple EP-CM250B units can be integrated into an AI-optimised central compressed air station providing full-capacity redundancy and demand-tracking efficiency across the entire compressed air plant. For very large facilities where a single 250 kW unit covers part of the demand and a second unit provides redundancy and peak coverage, the station management system coordinates both units automatically without operator intervention.
No Mid-Life Capital Events
The water-lubricated single-screw design has no rotor coatings to degrade, no timing gears to wear, and no intercooler tubes to clean or replace. At 250 kW, the capital cost of any mid-life replacement component in a dry oil-free alternative is substantial. The EP-CM250B's design eliminates these components — and therefore eliminates the mid-life capital events they generate — across the full 25-year service life.
Customer Case Studies
South Korea — Major Commercial Shipyard
Industry: Shipbuilding | Application: Central compressed air for LNG carrier outfitting — tools, painting, and testing across a major vessel during simultaneous multi-trade operations
"LNG carrier outfitting requires Class 0 oil-free painting air for the insulated tank coating systems — any oil contamination of the cryogenic insulation coating compromises thermal performance and risks classification survey failure. The EP-CM250B at 42.88 m³/min covers our entire berth during peak outfitting with stable pressure. Single-unit operation has eliminated the compressor coordination failures we previously experienced with our three-unit station."
★★★★★
Saudi Arabia — Large Integrated Chemical Complex
Industry: Chemical Manufacturing | Application: Central instrument air for a major methanol and ammonia production complex with 2,500+ pneumatic control devices
"Our instrument air specification requires both high volume and structural oil-free status — safety system air supplies cannot use filter-dependent oil removal in our safety case documentation. Two EP-CM250B units in load-sharing configuration provide 85.76 m³/min total capacity with full redundancy. In 30 months of continuous operation at our site ambient of 38–48°C, performance has been consistent with our commissioning baseline — the isothermal water lubrication maintains stable output in our extreme climate."
★★★★★
Singapore — Hyperscale Data Centre Campus
Industry: Data Centre Infrastructure | Application: Compressed air for cooling system pneumatic actuators, UPS room ventilation dampers, and facility maintenance across a multi-building hyperscale data centre campus
"Data centre facilities require compressed air that meets food-grade equivalent cleanliness for pneumatic components in cooling systems that must never fail. The EP-CM250B's structural Class 0 oil-free air satisfies our infrastructure quality management requirements. The 42.88 m³/min output from a single unit in our central plant room serves the entire campus compressed air demand. Zero unplanned failures attributable to the compressed air supply in 20 months of operation."
★★★★★
Frequently Asked Questions
Extra-Large Industrial Capacity. Structural Class 0. Single Machine.
Major shipyards, large chemical complexes, data centres, and industrial campuses in South Korea, Saudi Arabia, Singapore, and 50+ markets rely on Ever Power 250 kW water-lubricated technology for their most demanding compressed air infrastructure. Contact our engineering team for a complete central station design.
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