By E. M Talbott
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Extra resources for Compressed air systems: a guidebook on energy and cost savings
Larger compressors, reciprocating and rotary positive displacement units normally are flange connected. Some designs of compressors have a shaft directly coupled with the driver. This is typical of large turbine driven dynamic compressors. Speed changing gears in the driving train are seen less frequently, most often for powering centrifugal compressors with electric motors. 3 Controls There is a growing variety of control systems available for compressed air installations. These most often concern electric driver controls and compressor controls.
The controls for synchronous motors, which are used less frequently, are more complex and should be specifically tailored to each installation by the electrical equipment supplier. They will not be discussed here. The most frequentlyused induction motor starting procedures are: Full voltage starting Reduced voltage starting Star/delta connection Resistance Auto-transformer Solid state voltage reduction Variable voltage for starting and reduced load Variable speed controllers Direct full voltage starting is generally limited to small compressors (less than 250 hp).
Page xi It has been the intention of the authors that the book be factual and understandable to working level engineers and supervisors. " Therefore, a style somewhat less formal than that of most technical reports has been adopted. And yet, it is believed that the significant data and methodology have been covered. Special appreciation must be expressed to the many members of the compressed air industry for their generous assistance with this publication. Companies, industrial associations and individuals have contributed thought, suggestions and constructive criticism to the early drafts of this work in an effort to make this a valuable aid to compressed air users.
Compressed air systems: a guidebook on energy and cost savings by E. M Talbott