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The 11kW (15HP) Oil-Free Scroll Air Compressor is a high-efficiency, compact compressed air solution that utilizes advanced scroll technology to deliver 100% oil-free air. Unlike traditional piston or screw compressors, this unit employs two spiral-shaped scrolls – one fixed and one orbiting – that interlock to compress air through a smooth, continuous motion.
The scroll compression principle works as follows: as the orbiting scroll moves around the fixed scroll, it traps air between the two spiral elements and progressively pushes it toward the center, where it exits at high pressure. This design requires no oil in the compression chamber, making it ideal for applications where air purity is critical.
| Model | RO-11A |
| Air Delivery | 1.0~1.2 m3/min |
| Power | 11/15kW |
| Air-end | 5.5kW*2 |
| Noise | 60dB(A) |
| Outlet diameter | G3/4 |
| Dimension | 852*1274*1330mm |
| Weight | 450kg |
1. 100% Oil-Free – Class 0 Air Quality
The compression chamber is physically separated from all lubrication systems – no oil is ever used in the compression process. This guarantees absolutely oil-free compressed air, meeting the highest purity standards for sensitive industrial applications.
2. Ultra-Quiet Operation – Ideal for Indoor Use
With noise levels as low as 58 dB(A), this compressor is significantly quieter than piston or screw alternatives. Scroll compressors are known for their quiet operation and low vibration, making them perfect for indoor and noise-sensitive environments.
3. Compact & Space-Saving Design
The scroll design features far fewer moving parts than piston compressors – approximately 1/10 of the components. This results in a compact footprint that saves valuable floor space. The unit can be installed close to the point of use, reducing piping costs.
4. High Energy Efficiency
Scroll compressors typically demonstrate high energy efficiency, potentially resulting in long-term cost savings. The direct-drive design eliminates transmission losses, and the multi-head configuration (3 × 3.7kW scroll elements) allows for intelligent load matching.
5. Low Maintenance & High Reliability
With very few wearing parts and no oil filters, separators, or valves to replace, maintenance requirements are minimal. The scroll wraps do not physically contact each other during operation, so wear is extremely low – ensuring a long service life.
6. Smooth, Continuous Airflow
The scroll geometry delivers continuous, pulsation-free airflow – eliminating the need for valves and reducing pressure drops. This results in more stable downstream operations.
7. Multi-Head Modular Design
The 11kW model typically integrates three 3.7kW scroll compression elements. The PLC controller intelligently starts and stops individual elements to match actual air demand, ensuring optimal efficiency at all load conditions.
Oil contamination in compressed air
100% oil-free design – no oil in compression chamber. Eliminates risk of product spoilage, equipment damage, and quality issues.
High noise levels disturbing workplace
Ultra-quiet operation (≤58 dB(A)) – can be installed directly on the workshop floor without noise disruption.
Frequent, costly maintenance:
Minimal moving parts – no oil filters, separators, or valves to replace. Only periodic filter cleaning required.
Limited factory floor space
Compact design – saves valuable floor space. Can be installed close to point of use.
High energy costs
High energy efficiency – direct-drive design and intelligent load matching reduce power consumption.
Unstable or pulsating airflow
Continuous, pulsation-free airflow – ensures stable downstream operations.
Waste oil disposal costs
No oil use = no oil waste – eliminates disposal costs and environmental compliance issues.
Downtime from compressor failure
Multi-head modular design – if one element fails, others continue operating.
The 11kW Oil-Free Scroll Air Compressor is suitable for a wide range of industrial applications where clean, oil-free compressed air is essential:
General Manufacturing: Pneumatic tools, assembly lines, material conveying, packaging machinery
Electronics & Precision Assembly: Clean air for delicate component handling, PCB assembly, and SMT equipment
Spray Painting & Coating: Oil-free air to prevent surface defects in automotive, furniture, and metal finishing
Food & Beverage Processing: Oil-free air for filling, capping, and labeling lines – meets food-grade air standards
CNC Machining & Automation: Powering pneumatic actuators, robotic grippers, and air bearings
R&D Laboratories: For analytical instruments, environmental chambers, and general lab air supply
Textile & Chemical Industries: Contaminant-free air for sensitive processes
Laser Cutting: Clean, dry air for laser cutting machines
| Oil-Free Scroll vs. Oil-Free Screw Compressor | ||
| Comparison Aspect | Oil-Free Scroll (11kW) | Oil-Free Screw |
| Power Range | 0.3 – 37kW | Typically 22kW and above |
| Flow Capacity | Lower (1.08–1.25 m³/min) | Higher (larger volumes) |
| Noise Level | Very low (≤58 dB(A)) | Moderate (typically 63–70 dB(A)) |
| Structure | Simple – few components | Complex – more components |
| Maintenance | Very low – minimal parts | Moderate – more complex |
| Manufacturing Cost | Lower | Higher |
| Single-Stage Pressure | Higher (up to 10 bar) | Lower – may need 2-stage |
| Best For | Small to medium flow, variable load | Large flow, constant load |
Key Insight: If you need large flow, high efficiency and high air quality, an oil-free screw air compressor may be more suitable. However, if you pursue compact structure, low noise, low vibration and low-cost equipment, the oil-free scroll air compressor is a good choice.
Note on 11kW Power Range: At the 11kW power level, scroll compressors are often the preferred choice because:
They offer lower noise and less vibration than screw compressors at this size.
They have simpler maintenance with fewer components.
They are more cost-effective to manufacture and operate.
Q1: What is an oil-free scroll air compressor?
A: It uses two spiral-shaped scrolls (one fixed, one orbiting) to compress air without any oil in the compression chamber. The result is 100% oil-free, clean compressed air.
Q2: How do I know it produces truly oil-free air?
A: The scroll design uses no oil in the compression process – bearings are lubricated separately and sealed off. The unit meets ISO 8573-1 Class 0 standards for oil-free air quality.
Q3: What are the key specifications of the 11kW model?
A: Power: 11kW (15HP); Air delivery: 1.08–1.25 m³/min (38–44 CFM); Pressure: 8–10 bar (116–145 psi); Noise: ≤58 dB(A); Voltage: 380V/50Hz/3Ph.
Q4: Is it really quiet enough for indoor use?
A: Yes. At ≤58 dB(A), it is quieter than a normal conversation and significantly quieter than piston compressors. Perfect for workshops, laboratories, and other indoor environments.
Q5: How much maintenance does it need?
A: Very little. The main task is periodic cleaning or replacement of the inlet air filter. No oil changes, no oil filters, no separators – minimal downtime and costs.
Q6: Can it run continuously?
A: Yes, it is rated for continuous industrial duty. The multi-head design (3×3.7kW elements) allows individual elements to start/stop based on demand, reducing wear.
Q7: What happens if one compression element fails?
A: The multi-head modular design ensures that if one element fails, the others continue to operate, maintaining consistent airflow.
Q8: What is the warranty period?
A: Please contact our sales team for specific warranty terms.
Q9: Do you provide technical drawings or installation manuals?
A: Yes, we supply detailed installation instructions, dimension drawings, and performance curves upon request.
Q10: What is the typical delivery time?
A: Standard lead time is around 15–30 days, depending on order quantity
