Low pressure two stage screw compressor H series

The H series two-stage screw air compressors are designed for large industrial installations with high and continuous compressed air demand. The two-stage compression process divides compression into two consecutive stages, supporting efficient pressure generation and stable performance during continuous operation.

The series includes models from 132 to 315 kW, with free air delivery ranging from 18.5 to 63.2 m³/min and working pressure configurations of 7, 8, 10 and 12.5 bar. These compressors are suitable for large manufacturing plants, metal processing facilities, CNC production departments, automotive factories and central compressed air systems.

Two-Stage Screw Air Compressors for Industrial Installations

The H series two-stage screw air compressors are designed for applications requiring high air delivery, stable pressure and reliable continuous operation. Unlike a single-stage design, air compression takes place in two consecutive stages.

Dividing the process allows the required final pressure to be reached progressively. This arrangement is suitable for high-power compressors operating for extended periods in large industrial systems.

The H series covers power ratings up to 315 kW and maximum free air delivery of 63.2 m³/min. The models can be used as primary machines in central compressor stations or as part of a multiple-compressor installation.

Models from 132 to 315 kW

The H series includes eight main models:

SCR180H – 132 kW / 180 HP;
SCR220H – 160 kW / 220 HP;
SCR250H – 185 kW / 250 HP;
SCR270H – 200 kW / 270 HP;
SCR300H – 220 kW / 300 HP;
SCR340H – 250 kW / 340 HP;
SCR375H – 280 kW / 375 HP;
SCR400H – 315 kW / 400 HP.

The SCR180H and SCR220H are suitable for large production areas and central systems with medium to high demand. The SCR250H, SCR270H and SCR300H cover larger manufacturing loads, while the SCR340H, SCR375H and SCR400H are intended for facilities with very high and continuous compressed air consumption.

Selection should be based on actual air delivery at the required pressure. Motor power alone does not determine whether a specific model is suitable for an installation.

Free Air Delivery from 18.5 to 63.2 m³/min

The series covers an overall free air delivery range from 18.5 to 63.2 m³/min. The minimum value applies to the SCR180H at 12.5 bar, while the maximum applies to the SCR400H at 7 bar.

Maximum values at 7 bar include:

SCR180H – 28.5 m³/min;
SCR220H – 33 m³/min;
SCR250H – 39 m³/min;
SCR270H – 43 m³/min;
SCR300H – 45.8 m³/min;
SCR340H – 51.5 m³/min;
SCR375H – 60 m³/min;
SCR400H – 63.2 m³/min.

These values represent performance at the lowest available working pressure. For a system operating at 10 or 12.5 bar, the air delivery specified for that exact configuration must be used.

Working Pressure of 7, 8, 10 and 12.5 Bar

All H series models are available in versions for 7, 8, 10 and 12.5 bar. This allows them to be used in standard industrial compressed air systems and in applications with higher pressure requirements.

Air delivery decreases as working pressure increases. For example, the SCR250H provides:

39 m³/min at 7 bar;
38.5 m³/min at 8 bar;
34 m³/min at 10 bar;
29 m³/min at 12.5 bar.

The SCR375H decreases from 60 m³/min at 7 bar to 46 m³/min at 12.5 bar.
The configuration must therefore be selected according to the pressure required at the final point of use, while also considering losses through pipelines, filters, dryers and other components.

How Two-Stage Compression Works

In a two-stage design, air passes through two separate compression stages. The first stage raises pressure to an intermediate level, and the second stage reaches the required final pressure.

This arrangement distributes the compression process and is suitable for large compressors operating for long periods at high output.

Actual efficiency depends on airend design, cooling, working pressure, system condition and the real load profile.

Advantages of Two-Stage Screw Air Compressors

The main advantages of the H series include:

high free air delivery;
stable operation under continuous load;
working pressure configurations up to 12.5 bar;
progressive generation of final pressure;
suitable design for high compressor power;
use in central compressor stations;
distributed load between compression stages;
reliable operation in multi-shift facilities.

Actual results depend on correct model selection and proper design of the complete compressed air system.

Applications of H Series Compressors

Large Manufacturing Facilities

The compressors can supply central pneumatic systems serving multiple production machines and manufacturing lines.

Metal Processing and Mechanical Engineering

Compressed air is used for CNC machinery, automated lines, pneumatic controls, blowing and other production operations.

Automotive Manufacturing

High and continuous air delivery is suitable for vehicle and component factories, assembly lines, robotic systems and pneumatic equipment.

Chemical and Processing Industries

The series can be used in industrial processes requiring continuous compressed air supply at stable pressure.

Central Compressor Stations

H series models are suitable as primary compressors in plant-wide systems. Critical installations can combine them with standby units or multiple compressors controlled according to demand.

DN80, DN100 and DN125 Outlet Connections

Outlet size increases according to compressor output:

SCR180H and SCR220H – DN80;
SCR250H, SCR270H and SCR300H – DN100;
SCR340H, SCR375H and SCR400H – DN125.

Correct main pipeline diameter is critical at air delivery levels above 20–60 m³/min. Undersized pipework can create excessive pressure drop and reduce the efficiency of the complete compressor installation.

Pipeline length, bends, branches, filters, valves and maximum simultaneous consumption must all be considered during design.

How to Select the Correct Two-Stage Compressor

Determine Actual Air Demand
Average, minimum and maximum compressed air consumption should be established. For existing systems, measurements across different production shifts are recommended.

Select the Correct Working Pressure
Use the lowest pressure at which equipment operates reliably. Add only the necessary allowance for actual pressure losses in the network.

Compare Air Delivery at the Required Pressure
The 7 bar value must not be used for a system operating at 10 or 12.5 bar. Technical evaluation must use the data for the exact pressure version.

Analyse the Operating Profile
Two-stage compressors in this power class are mainly intended for high and continuous loads. Operating hours, shift patterns and peak demand should be evaluated.

Provide Redundancy
For production processes that cannot tolerate interruption, a standby compressor or multiple-compressor arrangement is recommended. This allows servicing without stopping the complete system.

Check Installation Conditions
The models weigh from 4,700 to 9,500 kg and reach dimensions of 4000 × 2200 × 2300 mm. A suitable foundation, adequate ventilation, service clearance and a planned delivery route are required.

Designing a High-Flow Compressed Air System
For compressors from 132 to 315 kW, machine selection should be part of the complete compressor station design.

The system may include:

air receivers;
refrigerated or desiccant dryers;
line filters;
condensate drainage systems;
main and distribution pipework;
automatic multiple-compressor control;
air flow and energy monitoring.

Each component must be sized according to maximum air delivery and the required compressed air quality.

Consultation for H Series Compressor Selection
Accurate selection requires information about average and peak consumption, working pressure, production shifts, required air quality and future expansion plans.

Contact our team for technical consultation and assistance in selecting an H series two-stage screw air compressor according to the parameters of your industrial compressed air system.