Screw compressors based on the SRM design are marketed by licensees under a variety of trade names. These include Spiro-Flo, Pac-Air, Twistair, Rotair, Rollair, Vari-Air, Rota-Screw, Electra-Screw, Ecoflux, Ecoscrew and Novox.
The screw compressor was introduced in the 1950’s for dry compression applications for various gases, mainly in industrial processes, the chemical industries and municipal gas-works – fields in which it still maintains strong market shares. Another early application for the SRM screw compressor – used at airports in all parts of the world – is the generation of compressed air to start jet engines.
Since the beginning of the 1960’s, however, when the oil-flooded screw compressor was introduced, the primary application has been to produce compressed air. A vast majority of portable compressors in use today in construction and mining contain screw compressors manufactured under license from SRM.
Stationary screw compressors are also used widely to produce compressed air for pneumatic tools, air motors, and industrial measuring devices. A more elaborate version of the stationary model is used commonly in refrigeration and air-conditioning applications. The versatility of the screw compressor is especially useful in fields of refrigeration.
Refrigerant screw compressors can be used under a wide range of varying conditions, such as for deep- and rapid-freezing applications, air conditioning and for water or brine chillers. Other applications of increasing interest are the screw compressor used for transportation refrigeration and air conditioning.
There are many other general fields of applications, in addition to those mentioned above, in which the screw compressor fulfils special requirements in limited fields. As in most cases, these requirements often involve large capacities and small bulk, long life, infrequent maintenance demands and reliable operations. And these are the main features of SRM screw compressors.