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Oil-lubricated Rotary Screw Air Compressor
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What Is An Oil-Lubricated Rotary Screw Air Compressor
An oil-lubricated rotary screw air compressor is a type of industrial air compressor that uses two interlocking rotors to compress air. During operation, lubricating oil is injected into the compression chamber to reduce friction, absorb heat, and create a seal between the rotors.
Oil-lubricated screw compressors are known for their reliable performance, energy efficiency, and ability to provide a continuous supply of compressed air. They are widely used in manufacturing, automotive workshops, construction, and other industrial applications that require a stable compressed air supply.
- Reliable continuous operation — designed for long-running industrial air supply needs.
- High efficiency and stable air output — provides consistent compressed air for production equipment.
- Cost-effective for general industrial use — suitable for many applications where oil-free air is not strictly required.
How Does a Rotary Screw Air Compressor Work?
Two rotating helical rotors trap air and reduce its volume to build pressure. In an oil-injected compressor, the process follows four steps.
Air Intake
Filtered air enters the compression chamber through the inlet valve.
Compression
The rotors compress the air while injected oil cools, seals, and lubricates.
Oil Separation
Most oil is removed from the compressed air and recirculated.
Air Delivery
Compressed air is cooled, then supplied to storage or downstream air treatment and equipment.
VSD vs Fixed Oil-Lubricated Rotary Screw Air Compressor
Compare by air demand & operationFixed Speed
Air Demand
Stable and predictable
Motor
Runs at constant speed
Efficiency
Best near full load
Best For
Steady production lines
VS
VSD
Air Demand
Variable or fluctuating
Motor
Adjusts speed to demand
Efficiency
Better at partial load
Best For
Changing production loads
Quick choice:
Fixed Speed for consistent demand; VSD when air consumption
changes throughout the day.
Single-Stage vs Two-Stage Oil-Lubricated Rotary Screw Air Compressor
Compare by compression & workloadSingle-Stage
Compression
Completed in one stage
Structure
Simpler system design
Investment
Generally lower
Best For
General industrial use
VS
Two-Stage
Compression
Divided into two stages
Efficiency
Better for heavy-duty use
Investment
Generally higher
Best For
Large continuous air demand
Quick choice:
Single-stage suits most standard applications; two-stage is
better suited to large, continuous-duty systems.
How to Choose the compressor for Your Line
Pick your industry for typical power, pressure and air quality, then use the sizing table to confirm the flow you actually need — in m³/min and cfm.
Automotive
Paint shops, pneumatic tools and assembly lines
Typical power
45–160 kW
Working pressure
8 bar (7 bar at the point of use)
Air flow (FAD)
8–27 m³/min (283–953 cfm)
Air quality
ISO 8573-1 Class 1.4.1
Typical configuration
VSD, air-cooled, receiver + ring main
Required treatment
Refrigerated dryer + 0.01 µm coalescing + carbon filter
Tip: size on simultaneous tools, not connected tools. Paint booths drive the peak, and a VSD pays for itself on the swing.
Electronics & SMT
Assembly, conformal coating and clean processes
Typical power
37–110 kW
Working pressure
8 bar
Air flow (FAD)
6–18 m³/min (212–636 cfm)
Air quality
ISO 8573-1 Class 1.4.1
Typical configuration
VSD, air-cooled, oil class 1 filtration
Required treatment
Refrigerated dryer + coalescing + carbon filter
Tip: oil aerosol attacks conformal coating adhesion — specify oil class 1, and change the carbon filter on schedule.
Packaging & Printing
Corrugating, case erecting, flexo and offset
Typical power
22–75 kW
Working pressure
8–10 bar
Air flow (FAD)
4–13 m³/min (141–459 cfm)
Air quality
ISO 8573-1 Class 2.4.2
Typical configuration
VSD or fixed speed, air-cooled
Required treatment
Refrigerated dryer + particulate filter
Tip: corrugators and case erectors peak together — a VSD covers the swing without loading and unloading all day.
Textile
Air-jet looms, winding, spinning and finishing
Typical power
45–132 kW
Working pressure
8 bar
Air flow (FAD)
8–25 m³/min (283–883 cfm)
Air quality
ISO 8573-1 Class 2.5.2
Typical configuration
Fixed speed or two-stage, air-cooled
Required treatment
Refrigerated dryer + line filter + ring main
Tip: air-jet looms run flat out — on constant load a fixed-speed or two-stage machine usually beats a VSD on specific power.
Laser Cutting
Fiber laser assist gas and optics purge
Typical power
22–45 kW
Working pressure
13 bar
Air flow (FAD)
3.8–8 m³/min (134–283 cfm)
Air quality
ISO 8573-1 Class 1.2.1
Typical configuration
High-pressure unit, desiccant dryer
Required treatment
Desiccant dryer + three-stage filtration
Tip: pressure stability cuts dross more than extra volume does — put a receiver next to the machine.
Food & Beverage
Packaging, conveying, filling and cleaning
Typical power
37–110 kW
Working pressure
8 bar
Air flow (FAD)
6.5–18 m³/min (230–636 cfm)
Air quality
Class 1.2.1 — Class 0 needs oil-free
Typical configuration
VSD, air-cooled, sterile filtration
Required treatment
Refrigerated or desiccant dryer + sterile filter
Tip: if air touches the product, go oil-free. Oil-lubricated machines are for utility air only.
Pharma
Clean utilities, blister, coating and packaging
Typical power
30–90 kW
Working pressure
8 bar
Air flow (FAD)
5–15 m³/min (177–530 cfm)
Air quality
Class 1.2.1 minimum
Typical configuration
VSD, water-cooled option, validation package
Required treatment
Desiccant dryer + sterile filtration + validation documents
Tip: validation is the real cost — ask for the ISO 8573-1 test report before you place the PO.
General Machining
CNC, press, blasting and workshop air
Typical power
11–37 kW
Working pressure
8 bar
Air flow (FAD)
1.5–6 m³/min (53–212 cfm)
Air quality
ISO 8573-1 Class 2.4.2
Typical configuration
VSD, air-cooled
Required treatment
Refrigerated dryer + particulate filter
Tip: 15–20% margin is enough. Oversized machines run unloaded and burn power for nothing.
Sizing at a glance
1 m³/min ≈ 7 kW1 m³/min = 35.3 cfm at 8 bar — a first-pass estimate, not a selection
7–8% less FADfor every +1 bar at the same motor power
15–20% marginover measured demand — anything more is wasted money
| Motor power | FAD @ 8 barm³/min / cfm | FAD @ 10 barm³/min / cfm | FAD @ 13 barm³/min / cfm | Typical configuration |
|---|---|---|---|---|
| 7.5 kW | 1.1 / 39 | 1.0 / 35 | 0.83 / 29 | VSD, air-cooled |
| 11 kW | 1.6 / 56 | 1.4 / 49 | 1.2 / 42 | VSD, air-cooled |
| 15 kW | 2.3 / 81 | 2.0 / 71 | 1.7 / 60 | VSD, air-cooled |
| 22 kW | 3.6 / 127 | 3.2 / 113 | 2.7 / 95 | VSD, air-cooled |
| 37 kW | 6.2 / 219 | 5.5 / 194 | 4.7 / 166 | VSD or fixed speed |
| 55 kW | 9.5 / 335 | 8.4 / 297 | 7.2 / 254 | Fixed speed / two-stage |
| 75 kW | 13.0 / 459 | 11.5 / 406 | 9.8 / 346 | Fixed speed / two-stage |
| 110 kW | 19.5 / 689 | 17.3 / 611 | 14.7 / 519 | Two-stage, water-cooled option |
| 160 kW | 28.5 / 1006 | 25.2 / 890 | 21.5 / 759 | Two-stage, water-cooled |
| 250 kW | 45.0 / 1589 | 39.8 / 1405 | 34.0 / 1201 | Two-stage, water-cooled |
FAD at 20 °C, 1 bar(a), tested to ISO 1217 · 1 m³/min = 35.3 cfm. Oversizing by 20 kW costs about $16,000 a year at 8,000 running hours and $0.10/kWh.
Lubrication Guide
What Type of Oil Is Recommended for a Rotary Screw Air Compressor?
For most oil-injected rotary screw air compressors, manufacturer-approved synthetic or mineral compressor oil is recommended. Synthetic oil is preferred for continuous operation. Always follow the compressor manufacturer's specifications.
COMMON VISCOSITY
ISO VG 46
A common viscosity grade for many rotary screw compressors. Confirm with your manufacturer.
Common Compressor Oil Types
Synthetic
High thermal stability; best for demanding or continuous operation.
Mineral
Cost-effective for standard operation; shorter change intervals.
Food-Grade
For food-compatible applications, such as NSF H1 products.
Recommended Oil Viscosity
ISO VG 32
Lower viscosity, for specified models.
ISO VG 46MOST COMMON
Common industrial grade.
ISO VG 68
Higher viscosity, for heavier-oil models.
Selection Tip: Check the manufacturer's viscosity, temperature, and compatibility requirements. Avoid mixing different lubricant types without approval.
Application of Oil-lubricated Rotary Screw Air Compressor
Oil-lubricated rotary screw air compressors for Car
An oil-lubricated rotary screw air compressor is widely used in the automobile industry to provide reliable compressed air for assembly lines, painting, pneumatic tools, tire inflation, and automated production equipment.
Konw More Oil-lubricated Rotary Screw Air Compressor for Textile
An oil-lubricated rotary screw air compressor provides stable compressed air for the textile industry, supporting weaving machines, spinning equipment, air-jet looms, material handling, and cleaning processes.
Oil-lubricated Rotary Screw Air Compressor for Electronics
An oil-lubricated rotary screw air compressor is used in electronics manufacturing to provide stable compressed air for automated assembly, testing equipment, component handling, dust removal, and precision production processes.
Know More Oil-lubricated Rotary Screw Air Compressor for Manufacturing
An oil-lubricated rotary screw air compressor is commonly used in machinery manufacturing to power CNC machines, pneumatic tools, clamping systems, cleaning operations, and general production equipment.
Konw More Oil-lubricated Rotary Screw Air Compressor for Chemical
An oil-lubricated rotary screw air compressor is used in the chemical industry to supply compressed air for pneumatic valves, instrumentation, material transfer, mixing processes, and automated control systems.
Konw More Oil-lubricated Rotary Screw Air Compressor for Mining Industry
An oil-lubricated rotary screw air compressor is commonly used in the mining industry to support drilling equipment, ventilation systems, pneumatic tools, dust collection, and material handling applications.
Know More Features of Our Oil-lubricated Rotary Screw Air Compressor
German Technology(4:6 Rotor Profile)
The 4:6 rotor design, based on advanced German technology, ensures higher main engine efficiency with lower energy consumption.
Main Engine Warranty
Under normal operation, maintenance, and servicing with original EternelComp spare parts, the GHH main airend is covered by a warranty of up to 10 years.
Customized Solutions
The solution includes: Food & Beverage Industry、Power & Energy Industry、Electronics & Semiconductor Industry、Mining & Quarrying Industry.
Reduced Energy Consumption
Equipped with a high-efficiency permanent magnet synchronous motor, the compressor minimizes inherent energy waste during “no-load” and “low-load” operation.
High-Quality Assurance
As a professional air compressor manufacturer, we have ISO 9001:2015, CE, and TUV Class 0 Certification.
Global Reach
Exported to more than 40 countries, serving as a long-term supplier to China National Nuclear Corporation, Coca Cola, and Jiang Tong.
What We Offer
Our Service
As a certificated air compressor manufacturer, we are committed to providing maximized customer service to ensure air compressor systems running at peak efficiency 24 hours a day, 7 days a week — trusted by Fortune 500 companies, central enterprises, and listed enterprises worldwide.
24/7
Service availability
30 yrs
Technical experience
5 yrs
Avg. team experience
<24 h
Response time
Technical Training
30 years of technical expertise enabling comprehensive one-stop training programs for all customers.
Spare Parts Support
Genuine quality spare parts and lubricants supplied to ensure lifetime operation of your compressor.
Installation Guide
On-site installation via local dealers or remote guidance provided online by our technicians.
Trouble Shooting
Technical team delivers troubleshooting solutions for any compressor issue within 24 hours.
Maintenance
Dedicated maintenance support from experienced engineers keeping your system at peak efficiency.
We Compress Your Needs
Customized Air Compressor Solutions!
In addition to providing standardized products, we also provide customized services.
Voltage Customization
Customized solutions for different voltage conditions, including 208V/ 220 v / 230 v / 240 v / 380 v / 400 v / 415 v / 460 v / 575 v/ 50 hz / 60 Hz.
Custom Appearance
Provide various logo and color customization options according to customer needs.
Temperature Adaptation
Customized solutions for special working environment, such as working temperature above 55℃ or below -40℃.
Condition Adaptation
Customized solutions to meet special working pressure and capacity requirements.
Special Function
Provide multi-language control panel, remote control start and stop machine, and other functions as per request.
OEM Services
Manufacture all types of air compressors following your unique designs and specifications.
Our Air Compressor Factory
Air Compressor Certifications & Compliance
Guides On Oil-lubricated Rotary Screw Air Compressor
FAQ
Is an oil-lubricated rotary screw air compressor suitable for continuous operation?
Yes. An oil-lubricated rotary screw air compressor is designed for continuous-duty operation, making it suitable for factories and production lines that require a stable compressed air supply over long working hours.
Can oil-lubricated rotary screw air compressors be used in the food and beverage industry?
Yes, they can be used in food and beverage packaging, conveying, labeling, and general pneumatic automation applications. However, if compressed air comes into direct contact with food or beverages, proper air treatment systems or oil-free compressors are usually recommended.
What can happen if an incorrect oil type is used in a rotary screw compressor?
Incorrect oil can cause overheating, excessive wear, sludge buildup, and poor air–oil separation. Incompatible lubricants may also damage seals and lead to costly repairs. Always use the oil specified or approved by the compressor manufacturer.
Are oil-lubricated air compressors better?
Oil-lubricated compressors are often a cost-effective choice for general industrial use, offering effective cooling and lubrication. However, oil-free compressors are typically preferred when minimizing oil contamination is critical. The better choice depends on your air-quality requirements, operating conditions, and maintenance budget.
How do I calculate the FAD (m³/min or cfm) I need?
Add up the consumption of all tools and processes that run at the same time — not every tool connected to the line — then add 15–20% margin and correct for altitude and ambient temperature. As a first pass: 1 m³/min ≈ 35.3 cfm ≈ 7 kW at 8 bar. Send us your tool list and we will size it for you.
Do I need a refrigerated air dryer?
For general workshop, pneumatic tool and packaging air, yes: a refrigerated dryer holds the pressure dew point at about +3 °C and keeps water out of the line. For laser cutting, optics, instrument air or outdoor piping in cold climates, use a desiccant dryer rated to −40 °C.
How to place order？
When you are ready to order, please contact us to confirm the suitable solution & plan & model. What cannot be ignored is you should provide a copy purchase order to ensure that your order is processed properly.
What is the MOQ？
The MOQ, or minimum order quantity, for sample orders is just 1 set. However, for compressors ranging from 3.7-55kw, the minimum quantity is 3-5 sets. For compressors over 55KW, the MOQ is 1-2 sets. It’s important to note that the MOQ can be adjusted based on your specific situation, so be sure to discuss your needs with our team.
How long will you take to arrange production？
As an experienced air compressor manufacturer, our standard production time is typically between 20-25 days.
How about your after-sales service？
1. Provide customers with installation and commissioning online instructions.
2. Prepare and Well-trained engineers available to overseas service within one year.
3. Worldwide agents and after-slae service available.
Do you support OEM and ODM?
Yes — your brand, color, nameplate, manual and packaging. MOQ is 1 set for our own brand; OEM orders start at 5–10 sets depending on the model. Drawing approval takes 3–5 working days.
