Two-stage compressor range
Explore Okair’s two-stage screw air compressors for your plant’s pressure and airflow requirements. Browse available series, compare a two-stage option with your current single-stage setup, or discuss a new installation.
Three horizontal two-stage PM VSD screw air compressor models from 20 to 50 HP, rated for 8 bar and 2.9 to 7.4 m³/min. Compare capacity, installation size, outlet connection, noise, and motor protection before requesting a quote.
More air per kilowatt
Two-stage screw compression delivers more air per kilowatt by splitting compression across two stages and cooling the air between them. This reduces the work needed to reach the required pressure, lowering specific power. At the same working pressure and under comparable operating conditions, a two-stage design typically produces more air for the same input power, helping your plant meet its air demand with less electricity.
Single-stage or two-stage
Two-stage compression trades a higher initial investment for more efficient air production. Here are the typical differences between oil-lubricated screw designs at the same working pressure and under comparable operating conditions.
| Compare | Single-stage | Two-stage |
|---|---|---|
| Compression process | Single-stageThe full pressure rise takes place in one stage. | Two-stageTwo stages share the pressure rise, with cooling between them. |
| Airflow at the same input power | Single-stageLess air delivered. | Two-stageMore air delivered. |
| Specific power | Single-stageMore electricity needed per unit of air. | Two-stageLess electricity needed per unit of air. |
| Initial investment | Single-stageSimpler compression assembly and generally lower purchase cost. | Two-stageAdditional compression components and generally higher purchase cost. |
| Electricity cost at the same air demand | Single-stageHigher running electricity cost. | Two-stageLower running electricity cost, with savings building over operating hours. |
At similar working pressures and operating hours, higher air demand generally means greater electricity savings with a two-stage screw compressor. With lower air demand, those savings are smaller, so a single-stage screw compressor’s lower purchase price may offer better value.
View All Rotary Screw Air Compressors →Where efficiency matters most
Two-stage compression is a strong choice when compressed air accounts for a substantial share of your plant’s electricity use. Its lower specific power is especially valuable in these situations.
When several production lines draw compressed air throughout the day, even a small reduction in electricity used per unit of air adds up. Two-stage compression helps serve that combined demand with a lower electricity bill.
A two-stage unit is a strong fit for the steady base load in plants running multiple shifts or continuous production. Lower power consumption during those long loaded hours builds into substantial annual electricity savings.
If an existing single-stage compressor has high specific power, a well-matched two-stage replacement can supply the required airflow with less electricity. The opportunity is greatest when the current unit runs heavily for long hours.
Replacement or new installation
Tell us whether you are replacing a single-stage compressor or planning a new installation. Send your required pressure and airflow, operating hours and demand pattern, together with your power supply, quantity and destination. If available, include the current compressor model and operating records.
We can review the available series against your requirements. Model specifications and electrical configuration are confirmed for your order.
Include your project details in the message field.