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Our 110kW oil-free screw blower is engineered for mid-to-large scale aeration and material conveying applications. Utilizing advanced twin-screw rotor technology and precision manufacturing, it achieves 32% greater energy efficiency compared to conventional lobe-type blowers. With ISO 8573-1 Class 0 certification, it delivers completely oil-free air – ensuring the purest air quality for your mission-critical operations.
Advantages of Screw Blower Technology
1. 100% Oil-Free Operation – Class 0 Certified
No oil enters the compression chamber – not for lubrication, sealing, or cooling purposes
Fully compliant with ISO 8573-1 Class 0, the strictest international standard for oil-free air
No oil filters, separators, or disposal systems needed – lowering both maintenance effort and cost
2. Excellent Energy Performance – Up to 35% Lower Power Consumption
Built-in compression technology reduces energy use by up to 35% versus traditional Roots-type blowers
Optional Variable Speed Drive (VSD) adjusts output to match demand, cutting energy by up to 40% over fixed-speed units
Lower Specific Energy Requirement (SER) means reduced electricity bills and improved lifecycle cost efficiency
3. Quiet and Smooth Operation
Advanced muffler design and precision rotors significantly reduce operational noise – ideal for indoor or noise-restricted areas
Minimal pulsation and low vibration levels extend equipment life and enhance operator comfort
4. Robust Construction for Round-the-Clock Use
Engineered for continuous 24/7 duty with heavy-duty components that maximize uptime
All-in-one construction includes built-in oil tank, gearbox, pump, and filter for compactness and performance stability
Extended service intervals – up to 16,000 hours between oil changes on selected models
5. Consistent Airflow with Minimal Fluctuation
Provides smooth, stable air delivery with negligible pulsation – essential for pressure-critical operations
Standard pressure range: 0.3 to 1.2 bar, customizable to match specific process needs
6. Space-Saving Package Design
Highly integrated layout reduces floor space requirements
Supplied as fully assembled, pre-tested plug-and-play units
Wastewater Treatment – Biological aeration, dissolved air flotation, and filter backwashing – dependable air supply for around-the-clock operations
Food & Beverage – Conveying, drying, packaging, and fermentation – oil-free air ensures product integrity and regulatory compliance
Pharmaceuticals – Clean air for production lines and material handling – ISO Class 0 certified for maximum purity
Pneumatic Conveying – Transfer of cement, plastics, powders, and resins – stable pressure prevents blockages and contamination
Chemical & Petrochemical – Process aeration, oxidation, and fluidization – oil-free air avoids catalyst contamination
Electronics – Pure air for cleanrooms and PCB assembly – zero oil risk protects sensitive components
Aquaculture – Pond and tank aeration – oil-free air supports healthy aquatic life
Cement & Bulk Materials – Material fluidization and conveying – reliable under harsh conditions
Fermentation & Bio-Processing – Sterile air supply for cultures and bioreactors
Textiles – Air-jet weaving and yarn processing – clean air enhances finished product quality
Customer Case Study: Screw Blower in Wastewater Treatment
Customer: Municipal wastewater treatment plant (medium scale, 50,000 m³/day capacity)
Challenge: The plant's old Roots blowers consumed high energy, produced excessive noise, and required frequent maintenance. Rising electricity costs and stricter environmental regulations demanded a more efficient, reliable aeration solution.
Solution
Replaced three 110kW lobe blowers with two 110kW oil-free screw blowers (Model RKEB70H-220RS) equipped with VSD. The new blowers supply continuous aeration air for biological treatment processes.
Results (6 months after installation)
Energy savings: 32% reduction in power consumption → annual electricity savings of approx. $28,000.
Noise reduction: From 85 dB(A) down to 72 dB(A) – improved working conditions for operators.
Maintenance: Extended oil change intervals (up to 16,000 hours) reduced downtime by 60%.
Reliability: Zero unplanned shutdowns over 6 months of 24/7 operation.
Air quality: ISO 8573-1 Class 0 oil-free air eliminated contamination risks in downstream processes.
Q1: How does a screw blower differ from a traditional Roots blower?
A: Screw blowers use internal compression (air compressed inside the rotor chamber), while Roots blowers use external compression. This makes screw blowers about 30% more energy-efficient.
Q2: Does "oil-free" mean no maintenance?
A: No. Routine maintenance is still required – gearbox/bearing oil changes, air filter replacements, and periodic inspections – but it's simpler and less frequent than oil-lubricated systems.
Q3: Why is ISO 8573-1 Class 0 certification important?
A: It's the highest standard for compressed air purity – zero measurable oil contamination. Essential for food, pharmaceutical, and electronics industries where trace oil can cause defects or regulatory violations.
Q4: What pressure range do these blowers cover?
A: Standard units: 0.3–1.2 bar(g). High-performance models: up to 2.5 bar(g) with flow rates up to 9,300 m³/h. Designed for low-pressure, high-volume applications.
Q5: How much energy can I save vs. a lobe blower?
A: Typically 30–40% energy savings. With VSD, additional savings of up to 40% by matching output to demand. Most users report total reductions of 30–35%.
Q6: What does routine maintenance involve?
A: Daily: check oil level, temperature, pressure, and listen for unusual noise. First service at 500 hours: replace oil filter. Periodic: air filter changes, gear oil replacement, bearing inspections. Some models: oil change intervals up to 16,000 hours.
Q7: Can it run 24/7 continuously?
A: Yes – purpose-built for heavy-duty, round-the-clock operation with rugged components for reliable performance and minimal downtime.
Q8: What are the lead time and warranty?
A: Standard models: 3–5 business days after order confirmation. Extended warranty available. Please contact our sales team for current lead times and warranty terms.
Q9: Do you offer customized solutions?
A: Yes – VSD integration, non-standard voltage/frequency (e.g., 415V/50Hz, 460V/60Hz), protective coatings for corrosive environments, OEM/ODM services, and sound-attenuating enclosures.
Ready to power your production with reliable compressed air?
Contact us today for a customized quote, detailed technical drawing, or site-specific recommendation. Our engineering team is ready to support your project.
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Contact for Screw & Oil Free Compressor Solutions - Rocky (rockycompressor.com)
