Screw compressors F-Serie with belt drive, on receiver tank and with refreigerated dryer capacity up to 1,1 m³/min

Screw Compressors: Design and Specifications

Models (FRD)
Receiver-Mounted and complete with refrigeration dryer

Models (FR)
Receiver-Mounted

Models (F)
Standard version on base frame

The Comprag screw compressors are available in different designs that are precisely tailored to the requirements of your operating environment. Whether as a space-saving individual component or as a ready-to-connect complete station - Comprag offers the right solution for your compressed air needs.

Models (FRD)
Complete All-in-One System

The Comprag FRD screw compressors represent the most comprehensive solution. They are built on a horizontal receiver tank and are fully equipped with an integrated refrigerated dryer.
Your advantages in detail:

• Network Stability and Component Protection: The horizontal receiver tank keeps the pressure in the network stable and prevents pulsation in the compressed air lines. This reduces the switching cycles in the operating mode of the Comprag screw compressor, which significantly extends the service life of the air end, electric motor, and drive system, and leads to an increase in energy efficiency.
• Compressed Air Quality: The refrigerated dryer is crucial. It removes the largest part of the air humidity from the compressed air. This prevents water in the compressed air lines, extends the service life of the compressed air lines, and protects the devices operated with the compressed air.
• Simple Installation: Since all components (compressor, receiver tank, dryer) are already connected ex works, you save considerable assembly effort and costs on site. The Comprag FRD system is ready for immediate operation.

Models (FR)
The Receiver-Mounted, Dryer-Free Solution

The Comprag FR screw compressors offer a compact solution that is also built on a horizontal receiver tank, but without an integrated refrigerated dryer
Your advantages in detail:

• Network Stability and Service Life: As with the FRD series, the receiver tank reduces pulsation in the compressed air lines. This lead to fewer switching cycles, which increases the service life of the air end, electric motor, and drive system and contributes to a significant increase in the energy efficiency of the Comprag screw compressor.
• Cost and Assembly Savings: Since all compressor components are already connected, you save assembly effort and costs. A refrigerated dryer can be flexibly and separately integrated into the compressed air line if required.

Models (F)
The Standard Design on Base Frame

The Comprag F screw compressors are the standard design mounted on a robust base frame.
Your advantages in detail:

• Flexibility and Space Saving: This is the space-saving version of the Comprag screw compressor for cases where the compressor is installed in a separate compressor room.
• Individual System Choice: All other components of the compressed air system - such as the compressed air receiver, the refrigerated dryer, and the filters - can be selected as needed and installed externally. This offers maximum flexibility in designing your compressed air network.

Choose the Comprag screw compressor in the design that best suits your spatial conditions and quality requirements.

The Comprag screw compressors are the foundation of our reliable compressed air generation. They industrially produce compressed air of the highest quality, optionally with an integrated refrigerated dryer, and thereby achieve the demanding class 4-4-4 according to ISO 8573-1:2010.

The robust design of Comprag compressors focuses on the longevity and efficiency of its core components:

This is how your Comprag screw compressor generates compressed air

The detailed compression process of your Comprag screw compressor

A screw compressor operates on the principle of continuous compression and is designed for continuous operation. The core component of every Comprag screw compressor is the screw block with two counter-rotating, interlocking rotors (a main shaft and a counter shaft).

The Comprag screw compressor generates compressed air through a continuous, multi-stage process, driven by the electric motor (2) via the belt drive (9) (or direct drive in the D/DV series).

1. Intake and compression: Ambient air is cleaned by the air filter (4) and enters the screw block (1) via the air intake valve (3). Here, the air is continuously compressed by means of the rotor pair.
2. Oil injection and mixture formation: Simultaneously, oil (orange) is injected into the compression chamber. The oil lubricates, seals, and dissipates the intense heat generated during compression. A hot air-oil mixture (orange/blue) is formed.
3. Separation of the mixture: The air-oil mixture flows into the air-oil separator tank (5) where most of the oil is separated.
4. Cleaning and cooling: The pre-cleaned air passes through the air-oil separator (7) for fine separation (for a residual oil content of a maximum of 3 mg/m³). Both the hot, clean compressed air (blue) and the separated oil are then cooled via the heat exchanger (8). The fan (10) provides the necessary cooling air. The cooled oil is cleaned via the oil filter (6) and is ready for injection again.
5. Output: The cooled, clean compressed air (blue) leaves the Comprag screw compressor for your application.

This design guarantees a constant flow of compressed air - ideal for industrial applications.

The advantages of your Comprag screw compressor in use

A Comprag screw compressor offers significant advantages that directly impact your operating costs and production reliability. Through our consistent focus on quality, innovation, and efficiency, we guarantee minimal energy consumption and maximum investment security.

• High energy efficiency through frequency control: The frequency-controlled Comprag FV and DV series (Variable Speed Drive, VSD) in particular precisely adjust the motor speed to the actual air demand. This eliminates costly idle times and saves up to 25% electrical energy compared to conventional compressors with fixed load cycles, especially in cases of fluctuating demand.
• Continuous operation and durability: Comprag screw compressors are designed for uninterrupted 24/7 use in industrial environments. The screw block is designed for the highest loads, ensuring an extremely long service life and optimal reliability for applications with high and constant compressed air demands in manufacturing plants or industrial facilities.
• Low noise and vibration: The optimized rotor design and robust construction - especially the low-loss and low-wear direct drive of the D-series - result in less vibration and a significantly lower sound pressure level . This improves the working environment and often allows for decentralized installation of the screw compressor close to production.
• Space-saving and ready-to-connect complete solutions: Comprag FRD complete systems on a compressed air tank, including an integrated refrigerated dryer and pre-filter, deliver clean, dry compressed air from a compact unit. These solutions are ready for immediate use, reduce installation effort, and save valuable space in your building.
• Minimal maintenance costs and high serviceability: Thanks to the well-designed, service-oriented construction, all maintenance components such as filters and oil separators are easily accessible. This drastically reduces maintenance times, minimizes downtime, and keeps the life cycle costs of your Comprag screw compressor low.
• Intelligent and safe process control: The modern controls in our Comprag screw compressors (e.g., t-Log control) monitor all relevant operating parameters in real time (pressure, temperature, maintenance intervals). They automatically optimize operation, increase process reliability, and can be integrated into your higher-level building management systems if required.
• Effective heat recovery options: A large portion of the energy supplied to the Comprag screw compressor (up to 94%) is released as heat. By using our optional heat recovery systems, you can utilize this waste heat for heating buildings or for hot water production. This further reduces your energy costs and improves your environmental footprint.

Our Comprag screw compressors - the right model for every need

Discover the wide range of our Comprag models, from reliable standard systems to highly energy-efficient direct drive and frequency control solutions:

Choose the right Comprag screw compressor and benefit from robust technology, impressive performance, and long maintenance intervals. We stand for quality and innovation in compressed air technology.