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COMPRESSED AIR
compressor example in a glass industry process plant, demonstrates a 50 per cent excess of air flow rate during the mould changing phase, equivalent to about an hour a day. To avoid wasting this air, an air assessment
auditor recommended replacement of the centrifugal compressor with a 500kW variable-speed screw compressor, thus eliminating the blow-off and saving around €10,000/year. However, this solution overlooked the fact
that during remaining 23 hours of full load operation, the two-stage screw compressor would have generated operating costs of approximately €100,000/year more than the three-stage centrifugal compressor. If fluctuations in air demand are minimal,
the fixed-speed screw compressor with an adequate buffer tank can be a valid alternative, particularly below 200-250kW where it requires a lower initial investment, while ensuring good efficiency. In addition to the air flow and variability
requirements, there are a few further considerations. The centrifugal compressor, with its various pre-configured options enables greater
flexibility and there is also the possibility of having additional options engineered on request. In contrast, screw compressors are
supplied in standard configuration with a sound enclosure, which guarantees quieter operation in environments requiring a very low noise level. For the centrifugal compressor, the sound enclosure is optional, as the centrifugal technology is inherently quieter. The design of the centrifugal compressor is
extremely compact, enabling simple installation alongside a range of standard options pre-mounted on the machine, including air filter, condensate circuit, water manifold with individual flanged connections and control panel with integrated starter. The installation of a screw compressor is
even easier still, with a plug and play configuration. The final consideration is the ongoing
maintenance costs, which is an important component in the overall cost of ownership. All compressor models are now being
designed to optimise service and repair costs, with easy access to major components, but compared to rotary screw
Ingersoll Rand
www.ingersollrand.com
compressors, a 30-35 per cent saving is estimated on centrifugal technology. This is in part due to the compression unit having fewer components subject to wear and tear, which also guarantees greater performance consistency over time. Ready to learn more? Contact the experts
at Ingersoll Rand to schedule a complimentary system review.
LESS ENERGY MORE AIR,
HPC KAESER compressed air systems have a reputation for quality, reliability & longevity. But did you know they’re market leaders in energy performance, too?
Find out how to get more air for less energy - and save money.
Tel: 0845 430 0472 Email:
info@hpcplc.co.uk Web:
www.hpccompressors.co.uk
NOVEMBER 2023 | PROCESS & CONTROL 15
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