New VSD models for Atlas Copco's large screw compressor range

The adoption of smart design principles has improved airflow, measured as free air delivered (FAD). Operators can now select smaller compressors for the same applications, thus saving money and energy. Atlas Copco's progressive improvements and engineering breakthroughs − such as the new generation asymmetric compression element incorporated in these machines − has increased FAD by an average of 20 per cent across the range.

With the use of variable speed drive technology, energy savings of up to 35 per cent are achievable by automatically adjusting the motor speed to match the air demand. In addition, the optional energy recovery system can recoup up to 75 per cent of the compressor's shaft power as hot water, which can be re-used for process operations or premises heating applications.

Specific Energy Requirement (SER) is a measure of how efficiently electrical power is used to produce compressed air. The new compressors' combination of a high efficiency IP55 motor and optimised, gear-driven transmission system contributes to increased energy efficiency and results in an overall improvement in SER of 11 per cent against comparable compressors.

The compressors are available in a standard pack or as full feature, air-cooled or water-cooled versions. They are designed for standard operating conditions of up to 46degC/115degF. With an integrated dryer, the full feature GA FF models provide dry, compressed air at a pressure dew point of +3degC/37degF while ensuring low pressure drop and minimal installation costs.

The new range has been designed from the outset for easy installation and serviceability. The compact design, now with a 5 per cent smaller footprint than previous models, includes internal piping, coolers, motors, lubrication and a control system supplied as a ready-to-use, plug and run package. To help reduce service costs, all components and consumables offer a long operational lifetime of up to 8000 hours and are easily and safely accessible via large opening doors.

All models incorporate the Elektronikon Mk5 Graphic Plus controller for total operational control and remote online monitoring through a simple Ethernet connection. This enables internet-based visualisation via the compressor's user-friendly 5.7-inch colour display, and also helps to provide full system protection with service scheduling and built-in safety alarms. The controller connects to SmartLink, Atlas Copco's compressor data monitoring programme, which intelligently gathers, compares and analyses data to help compressed air users increase maintenance and service efficiency.

In parallel with the new GA range launch is the introduction of a larger version of Atlas Copco's UD+ coalescing filter. The UD+ replaces conventional two-stage oil aerosol and solid particles filters by incorporating innovative Nautilus two-in-one filter technology, which provides higher energy efficiency without compromising on performance or reliability.

In classic filter construction pleated media are used to reduce pressure drop, but this method increases the risk of cracking and oil carry-over; resulting in poor air quality. The Nautilus filter technology incorporated into the UD+ eliminates the risk of cracks in the filter media because they are wrapped around the filter's stainless steel core. The less dense filter media used in Nautilus technology ensures much easier passage of the air, leading to a significant pressure drop reduction that is 40 per cent lower than a combination of conventional two stage oil aerosol and solid particles filters; but with the same level of filtration efficiency.

The net effect is increased energy efficiency with lower running costs. The two-in-one filtration concept reduces installation space and complexity, making UD+ filters particularly suitable for applications where space is at a premium.

Learn more about the range of oil-injected rotary screw compressors at www.atlascopco.co.uk/compressorsuk.