Screw Compressor Manufacturing Excellence

World leaders in manufacturing screw compressors

Today in thousands of applications worldwide, Howden screw compressors provide high integrity, low maintenance solutions for liquid chilling, direct refrigeration and gas compression.

Our comprehensive testing standards is key to remaining committed to manufacturing the highest quality compressors in the industry.

The industry’s largest and most versatile range of oil injected and oil free screw compressors are tested in our Renfrew centre.


Key Components



All rotors for Howden twin screw compressors are machined from solid bar or forgings on highly accurate cutting machinery. The standard material is carbon steel, but forgings or special alloys can be used for more arduous applications. Following machining and balancing to ISO standards, male and female rotors are paired for assembly to ensure the ideal combination for maximum efficiency.



Casings are precision machined from castings using state of the art horizontal machining centres to achieve the essential close tolerances. Cast iron is the normally casing material; alternative casing materials are spheroidal graphite iron or various grades of steel. The main casing and the inlet and outlet end covers are flanged, bolted and dowelled through flanges to ensure correct alignment. Removal of the end covers provides ready access for maintenance when required.

Compressor Assembly

Compressor Assembly

All oil injected twin screw compressors are factory assembled by skilled engineers. The casing components are hydraulically tested to a minimum of 1.5 times maximum operating pressure to ensure integrity. Additionally, all oil injected compressors are tested with air under water following final assembly. The compressors are then mechanically run on air test rigs to confirm that volumetric efficiency, absorbed power, oil flows and vibration levels meet the stringent acceptance standards.

Our Renfrew Manufacturing Facility

Centre of excellence for compression technology

  • Site Area (m²): 65,000 
  • Factory Area (m²) 10,500 
  • Quality ISO 9001:2015
  • Health & Safety ISO 45001:2018
  • Environmental ISO 14001:2015
  • 5 Test Beds


The digitally enabled Test Suite in Renfrew

A unique and enhanced environment for equipment testing

Transforming your equipment testing experience. Equipment testing is an essential part of purchasing a Howden Compressor. Many of our customers observe the compressor testing by traveling to Renfrew, from all over the world, to validate the performance and reliability of their product before being shipped. This studio has made on-site testing a more comfortable and convenient experience. It is fitted with multiple screens showing the test data in real-time, live from the test bed, and a live video link showing the product being tested. With our world leading digital solutions not only have we transformed the test experience, as you’ll see today, but we now offer remote witness testing. With the new digital enhancements, you can observe the test on any smart device, anywhere in the world with an internet connection, and be confident in the process without the travel or time commitment


If you would like to submit an enquiry please get in touch.