Rotary Screw
Compressors
Airpower is an importer and manufacturer of many makes and types of direct and belt rotary screw driven compressors. Driven by: direct on-line, star-delta, inverter / variable speed energy efficient permanent magnet electric motors
Why use a rotary screw compressor?
A screw compressor can operate at high speeds while combining a large flow rate with small exterior dimensions. There are two primary
rotary screw compressor versions; oil-free and oil-injected. For each version, there are options of fixed speed or variable speed drive operation.
Rotary screw compressors operate with optimal energy efficiency.
Other benefits include:
- 100% Duty Cycle
- Continuous operation at temperatures up to 46 degrees
- Low noise output
- Low oil-carry-over in oil lubricated machines
- Zero loss of capacity over time
Our Range of Rotary Screw Compressors
USAir 100
Details
Input power: 380/400 Volt Three phase, 50 Hz, 75 kW, 100 hp.
VSD Drive Protection
Max pressure: 13 bar, 189 psi.
Weight: 2500kg
USAir 50
Details
Input power: 380/400 Volt Three phase, 50 Hz, 37 kW, 50 hp.
VSD Drive Protection
Max pressure: 13 bar, 189 psi.
Weight: 588kg
USAir 30
Details
Input power: 380/400 Volt Three phase, 50 Hz, 22 kW, 30 hp.
VSD Drive Protection
Max pressure: 13 bar, 189 psi.
Weight: 440kg
USAir 20
Details
Input power: 380/400 Volt Three phase, 50 Hz, 15 kW, 20 hp.
VSD Drive Protection
Max pressure: 13 bar, 189 psi.
Weight: 410kg
USAir 10
Details
Input power: 380/400 Volt Three phase, 50 Hz, 7.5 kW, 10 hp.
VSD Drive Protection
Max pressure: 13 bar, 189 psi.
Weight: 392kg
What is a screw compressor and how does it work?
Download our Screw Compressor User Manual Here
FAQs
1. What is a rotary screw compressor and how does it work?
A rotary screw compressor uses two interlocking helical rotors (screws) to compress air efficiently. As air is drawn into the screw chamber, it gets trapped and compressed as the screws rotate. This continuous motion allows for a consistent air supply with minimal vibration and high energy efficiency.
2. What are the benefits of using a rotary screw compressor over a piston compressor?
Rotary screw compressors offer a 100% duty cycle, run at lower noise levels, and have fewer moving parts, which reduces maintenance. They’re ideal for continuous industrial use, unlike piston compressors which are better suited for intermittent tasks.
3. What is the difference between oil-free and oil-injected screw compressors?
Oil-injected screw compressors use oil for cooling and sealing, making them more durable for heavy-duty tasks. Oil-free compressors, on the other hand, avoid oil contamination and are typically used in sensitive industries like food, medical, or pharmaceuticals.
4. Should I choose a fixed speed or variable speed (VSD) screw compressor?
Fixed speed compressors run at a constant RPM, making them ideal for operations with consistent air demand. VSD compressors adjust their motor speed based on air demand, helping reduce energy consumption—ideal for businesses with fluctuating usage.
5. Do you supply and service rotary screw compressors across South Africa?
Yes, Airpower supplies, installs, and services rotary screw compressors nationwide. We stock a range of models from USAir 10 to USAir 100 and provide ongoing support, spare parts, and expert advice to keep your system running optimally.
Refrigerated Dryers
Refrigerated air dryers from 1000 liters/min up to 22000 liter/min ex-stock. Larger ex overseas. Dew point 4°C under pressure. Automatic drain pre and manual drain after filters.
Screw Compressors
Screw compressors have no valves or other mechanical forces to cause imbalances unlike piston compressors.
Compressor Components
Airpower keeps universal spare parts for compressors. Pressure switches, non return valves and safety valves are universal to all compressors. Bottom entry filters/ regulators, electric motors and starters can be used for many makes of compressors.
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