EP-CM250PV Variable Frequency Water-Lubricated Oil-Free Screw Air Compressor
The EP-CM250PV is a 250 kW permanent magnet VSD water-lubricated oil-free screw compressor delivering 17.15–42.88 m³/min at 0.8–1.25 MPa — an extra-large VSD model for major shipyards where outfitting air demand varies dramatically between vessel construction phases, large integrated chemical complexes serving as VSD trim control in central air stations, and major industrial facilities requiring energy-optimised Class 0 oil-free air at the 42+ m³/min VSD scale.
EP-CM250PV | 250 kW VSD Water-Lubricated Oil-Free Compressor — 42.88 m³/min for Variable Outfitting and Chemical Station VSD
Major shipyards and large integrated chemical complexes operate at a scale where the compressed air system serves entire production facilities — not individual processes or lines — and where the demand variation between operating states can span a 2:1 to 3:1 ratio. A shipyard in intensive hull outfitting consumes dramatically more compressed air than the same berth during steel fabrication. A chemical complex with a process unit offline for planned maintenance consumes significantly less instrument air than when all units run simultaneously. Fixed-frequency compressors serve both states at the same electricity cost. The EP-CM250PV serves each state at a proportional cost.
At 250 kW (340 HP) with a variable output range of 17.15–42.88 m³/min (606–1,514 cfm) at 0.8 MPa, the EP-CM250PV's permanent magnet VSD delivers extra-large industrial VSD capability — tracking shipyard outfitting phase transitions, chemical complex throughput variation, and large industrial facility demand cycles with ±0.1 MPa pressure precision. Structural ISO 8573-1 Class 0 oil-free air is maintained throughout the VSD range, protecting shipyard coating quality and chemical plant instrument air purity at every operating speed. Visit our products page for the complete CMPV series specification comparison.
Technical Specifications
| Parameter | 0.8 MPa | 1.0 MPa | 1.25 MPa |
|---|---|---|---|
| Motor Power | 250 kW / 340 HP (PM VSD) | 250 kW / 340 HP (PM VSD) | 250 kW / 340 HP (PM VSD) |
| FAD range (m³/min) | 17.15–42.88 | 15.60–39.00 | 13.87–34.64 |
| FAD range (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 |
| Drive Type | Permanent magnet VSD | Permanent magnet VSD | Permanent magnet VSD |
| Motor Efficiency | ≥94% (IE4 class) | ≥94% (IE4 class) | ≥94% (IE4 class) |
| Pressure Band | ±0.1 MPa | ±0.1 MPa | ±0.1 MPa |
| 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 Outfitting Phase Demand: Where 250 kW VSD Delivers Maximum Return
Vessel construction in a major shipyard is divided into phases that have radically different compressed air consumption profiles. During intensive block assembly and outfitting — when structural welders, pipefitters, electricians, and painters work simultaneously across a vessel's decks — air tool density is at maximum and compressed air demand approaches 40+ m³/min. During design freeze periods, procurement holds, or commissioning phases with minimal air tool activity, demand may fall to 18–22 m³/min. The EP-CM250PV's 17.15–42.88 m³/min VSD range covers this entire shipyard demand profile from a single machine, consuming energy proportional to the current outfitting activity level.
| Cost Dimension | Fixed-Frequency | Variable Frequency (VSD) |
|---|---|---|
| Energy over 10 years | ~80% of total ownership cost | ~45–50% — up to 35% electricity saving |
| Startup current | High inrush — 6–8× running current | Soft-start — zero inrush |
| Partial-load efficiency | Full power at 40% demand | Speed proportional to demand |
| Pressure band | ±2–3 bar (on/off cycling) | ±0.1 MPa continuous VSD control |
| Idle period waste | Continues at full speed | Reduces to minimum stable speed |
| VSD premium payback | — | Typically 6–18 months at large scale |
Key Features
Vessel Phase Demand Tracking
The EP-CM250PV tracks shipyard demand variation across vessel construction phases — intensive outfitting at 42.88 m³/min, steel fabrication at reduced demand, commissioning at minimum. Energy consumption follows the vessel construction programme rather than the peak intensive outfitting cost throughout all phases.
500,000–625,000 kWh Annual Saving Potential
At 250 kW and 65% average demand: annual VSD saving versus fixed-frequency amounts to approximately 500,000–625,000 kWh — one of the very highest absolute annual electricity savings available from a single VSD water-lubricated compressor unit. VSD premium payback is typically within 4–8 months at this scale.
Chemical Complex VSD Trim — Highest Range
As the VSD trim unit in a large chemical complex station, the EP-CM250PV's 17.15–42.88 m³/min range absorbs the full demand variation of a major chemical complex — from planned unit maintenance minimum to full-throughput maximum — while fixed-frequency base units serve constant demand at maximum efficiency.
Highest Output in 3100×1700×2090 mm Footprint
At 3900 kg and 3100×1700×2090 mm, the EP-CM250PV delivers 42.88 m³/min — the highest VSD output available in this compact footprint. For shipyard and chemical complex compressor rooms where floor space is constrained, this output density provides maximum compressed air capacity per square metre of installation area.
Structural Class 0 for Shipyard Coating Quality
Oil contamination in shipyard spray air compromises corrosion protection coating adhesion — particularly critical for LNG carrier insulation coatings and naval vessel anti-corrosion systems. The EP-CM250PV's structural Class 0 oil-free guarantee protects coating quality at every vessel construction phase and every VSD speed setting.
250 kW VSD Inrush Elimination
VSD soft-start at 250 kW eliminates inrush currents of 1,500–2,000 A. For shipyard power distribution systems that serve large welding generators, crane drives, and other heavy electrical loads simultaneously, eliminating 250 kW compressor inrush events significantly reduces peak demand charges and switchgear stress.
Customer Case Studies
South Korea — Major Commercial Shipyard
Industry: Shipbuilding | Application: VSD central compressed air for a major container ship and LNG carrier construction berth with strongly phase-variable outfitting demand
"Container ship outfitting requires 38–42 m³/min at peak multi-trade activity; structural fabrication phases require 18–22 m³/min. The EP-CM250PV tracks every construction phase automatically. Annual energy saving versus the fixed-frequency unit it replaced: 29%. For LNG carrier outfitting, the structural Class 0 oil-free guarantee also satisfied our cryogenic insulation coating contractor's air quality specification without any additional filtration equipment."
★★★★★
Germany — Large Integrated Chemical Complex
Industry: Chemical Manufacturing | Application: VSD trim control in a central instrument air station serving variable-throughput specialty chemical production units
"Our central air station serves instrument air demand ranging from 18 m³/min during maintenance periods to 42 m³/min at full multi-unit throughput. The EP-CM250PV as VSD trim unit absorbs all this variation while our two fixed-frequency base units run at constant efficient load. Station pressure has maintained ±0.1 MPa continuously since installation. Annual station energy saving versus previous all-fixed-frequency configuration: 22%. The structural Class 0 instrument air quality also satisfied our insurance underwriter's requirement for documented oil-free source technology at safety-critical valve actuators."
★★★★★
China (export market reference) — Large Container Port and Logistics Hub
Industry: Port Operations | Application: VSD central compressed air for container crane hydraulic backup systems, quay equipment, and logistics facility maintenance across a major port with variable operational scheduling
"Port operations have extreme daily demand variation — peak during vessel berthing and cargo operations, minimum during overnight reduced activity. The EP-CM250PV tracks our operational schedule. During minimum overnight demand, our compressor electricity drops to 38% of peak-operations consumption. Annual energy saving: 31%. The zero oil condensate output also satisfied our port environmental management system's discharge requirements — no oil-contaminated condensate, no hazardous waste disposal."
★★★★★
Frequently Asked Questions
Shipyard Phases. Chemical Station VSD. 250 kW Extra-Large.
Major shipyards, integrated chemical complexes, and large port operations in South Korea, Germany, China, and 50+ markets choose the EP-CM250PV for VSD energy optimisation at 250 kW extra-large industrial scale. Contact our engineering team for a complete phase demand analysis and station design.
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