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Screw compressor in Howden process gas package MANUFACTURINGEXCELLENCE HOWDEN COMPRESSORS3 Today in thousands of applicationsworldwide, Howden screw compressorsprovide high integrity, low maintenancesolutions for liquid chilling, directrefrigeration and gas compression.

Rotary twin screw compressor technology was developed in the 1930s by a Swedish company, SRM, in collaboration with Howden.

We manufactured the worlds first operational screw compressor and further developed the technology in the 1960s with the introduction of the oil injected twin screw compressor.

This has revolutionised designs of refrigeration and gas handling plants worldwide.

COMPRESSOR PACKAGE SYSTEMS Howden Compressors is a specialist manufacturer of twin screw compressors.

We supply oil injected bare shaft compressor units to independent packagers worldwide who design and supply gas and refrigeration systems on a local basis.

For high specification process critical applications we can offer this packaging service by use of our own specialist knowledge and capabilities through our Howden global companies.

RECENT DEVELOPMENTS Our leadership in technology has been maintained over many years by total commitment to continuous product development.

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In particular, we are committed to ensuring that products meet current and future demands for environmental protection by using CFC free refrigerants and by containment of hazardous gases.Moreover our compressors have been developed to operate at high efficienciesto conserve energy and give low operating costs.

Our compressors are capable of operation on all known refrigerants and gases.

We have over 30 years of experience on CO2 compression, and as CO2 becomes a standard refrigerant we have a proven compressor product available.

We are also actively increasing the range of our products to match customerrequirements, such as high pressure gas boosters for aeroderivative gas turbines, which now typically require gas supply at pressures above 50 bar.

We employ state of the artmachine tools to attain the highestpossible accuracy and tolerances so as to produce compressors with highefficiency and outstanding reliability.

ROTORSAll rotors for Howden twin screw compressors are machined from solid bar or forgings on highlyaccurate cutting machinery.

The standard material is carbon steel, but forgings or special alloys can be used for more arduous applications.

Followingmachining and balancing to ISO standards, male and female rotors are paired for assembly to ensurethe ideal combination for maximum efficiency.

CASINGSCasings 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 casingmaterials are spheroidal graphite iron or variousgrades of steel.

The main casing and the inlet and outlet end coversare flanged, bolted and dowelled through flanges toensure correct alignment.

Removal of the end coversprovides ready access for maintenance when required.

COMPRESSOR ASSEMBLY AND TESTING All oil injected twin screw compressors are factoryassembled by skilled engineers.

The casingcomponents are hydraulically tested to a minimum of 1.5 times maximum operating pressure to ensureintegrity.

Additionally, all oil injected compressorsare tested with air under water following finalassembly.

The compressors are then mechanicallyrun on air test rigs to confirm that volumetricefficiency, absorbed power, oil flows and vibrationlevels meet the stringent acceptance standards.

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