Performance, Precision, Partnership


All-round carefree package for PET container production

The SIGMA PET AIR complete booster system combines blow and control air production in a single operation-ready system. An air-cooled rotary screw compressor produces the control air whilst simultaneously serving as a pre-compression stage for the blow air. Blow air booster, system controller and all compressed air treatment components for both pressure systems are installed operation-ready on a base frame.

SIGMA PET AIR delivers the following performance parameters:

  • Flow rate up to 2772 m³/h
  • Blow air up to 45 bar

The SIGMA PET AIR complete booster system is the perfect choice for operators of PET container blow-moulding equipment with high expectations when it comes to reliability, cost-effectiveness and compressed air quality.


  • Rapid delivery, ready for immediate operation:
    Installation on a base frame reduces the unit footprint whilst also streamlining transport and setup. HPC KAESER is also capable of delivering complete, operation-ready SIGMA PET AIR systems installed in containers if desired by the customer
  • Unparalleled cooling without high cost:
    The majority of HPC KAESER boosters are equipped with air-cooled aftercoolers. In air-cooled units, a separate cooler with its own fan motor ensures minimal temperature differential (ΔT) between the intake air and compressed air, allowing customers to dispense with expensive water-cooled systems
  • Benefit from low maintenance requirements:
    Since the SIGMA PET AIR system has only two compression stages (rotary screw compressor and booster), significantly less service is required compared to multi-stage high-pressure reciprocating compressors with atmospheric compression

Components of the System:

The SIGMA PET AIR system comprises five key components:

  1. Energy-saving rotary screw compressor - The energy-saving SIGMA-Profile was developed and optimised by HPC KAESER and provides the basis for production of control and process air

  2. High efficiency booster - Booster compression ratios are kept to a minimum by precisely matching the booster to suit rotary screw compressor performance, which in-turn increases energy efficiency

  3. Class 1 compressed air quality - The SIGMA PET AIR system produces technically oil-free compressed air, whilst the oil and solid particle content is reliably kept below Class 1 limits as per ISO 8573-1

  4. Complete air receiver package - High- and low-pressure air receivers are both equipped with all necessary fittings, including an electronic condensate drain

  5. Automatic control - The HPC KAESER CONTROL monitoring and control unit is located in the main control cabinet, which also contains the booster controller (star-delta) and fuses for all drives